nx241-user-manual
Contents
1. 1 RRRASEL l A B gt gt 1 5 SAVE Set up It is possible to store and recall up to 10 user set ups including EARTH LIFT but excluding MUTE Additionally the current set up is saved in case of power failure every two minutes after the last change At power up this set up is restored Set ups are numbered from 1 to 10 When saving your set up you can choose a reference name up to 6 characters for identification purposes NOTE ALL SAVED SETUPS WILL BE ERASED WHEN DOWNLOADING A NEW VERSION OF THE SOFTWARE 1 6 RECALL Set up Recalling a user set up is forbidden if the family of cabinet is not the same When recalling a set up the unit will stay in the recall menu allowing another selection for comparison Switching from a set up to another is glitch free and instantaneous no muting takes place 1 7 Array EQ One array EQ gain control of 6dB 0 5dB step is included This filter frequency is factory tuned AlphaTD Controller Array EQ Frequency Hz Gain dB 10 000 Ap 8 0000 6 0000 e I 2 0000 FT 1 gt 2 000 LLL i 4 000 6 000 5 8 000 10 00 USER MANUAL LOAD1_80 DATE 30 08 00 12 48 PAGE 14 24 NOA TD CONTROLLER MENU USER UTILITIES System settings 4 ae TD CONTROLLER non FORM AM LUMI LUNI Mn m 1 2 1 REVISIONS ES A B er OO2. Each VCEQ and VCA is controlled by the synthesis of several signals issued from the various detection sections That synthesis is in fact the envelope of those signals with an optimised release and attack time for each VCEQ and VCA depending on its frequency range and the cabinet selected Displacement control The Sense input signal is sent to a shaping filter producing a signal whose instantaneous amplitude is proportional to the voice coil excursion This signal after rectification is compared to a preset threshold matching the maximum usable value as determined from laboratory measurements Any part of the signal exceeding the threshold is sent to the VCEQ control buffer while the VCEQ acts as an instantaneous limiter very short attack time to prevent displacement from overriding the maximum permissible value Temperature control Each sense signal is fed into a shaping filter one per transducer each one producing a signal proportional to the instantaneous current flowing into the voice coil of the transducer After rectification this signal is integrated with attack and release time constants equivalent to the thermal time constants of the voice coil and chassis producing a voltage which is representative of the instantaneous temperature of the voice coil When this voltage reaches the threshold value corresponding to the maximum safe operation temperature the VCA becomes active to reduce the Audio signal level and limit the
3. NEXO NX241 DIGITAL TDcontroller User Manual NX24I TD CONTROLLER Norms This equipment has been tested and found to complv with the following European and international Standards for electromagnetic Compatibilitv and electrical Safetv e Electrical safety CEI65 e Radiated emission EN55022 e Conduction emissions EN55022 e ESD tests EN61000 4 2 e Immunity to fast electrical transients sense input RS232 link and AC inlet EN61000 4 4 Safety Warning This unit is fitted with 3 pin IEC standard power socket For safety reasons the earth should not be disconnected To prevent shock or fire hazard do not expose the unit to rain or moisture To avoid electrical shock do not remove covers Dangerous voltages exist inside Refer servicing to qualified personnel only PAGE 1 24 NEXO NX241 DIGITAL TDCONTROLLER NOA QUICK START TD CONTROLLER TABLE OF CONTENT QUICK START 2 LIST OF SUPPORTED SET UPS 3 GENERAL DESCRIPTION 4 FRONT PANEL 4 REAR PANEL 5 CONFIGURATION 6 EQUALISATION amp FILTERING 7 DELAY amp POLARITY INVERSION 8 AUDIO INPUT OUTPUT 8 GENERAL FUNCTIONS 9 MENU USER UTILITIES 11 MAIN FAMILY SELECTION 11 USER SETTINGS 12 SYSTEM SETTINGS 14 CONFIGURATION SELECT 15 VOLTAGE SELECTION AND FUSES 16 PRECAUTIONS 16 POWER CONNECTION 16 115 230 SWITCHING 16 DOWNLOAD 17 WARNING 17 INSTRUCTION 18 PROTECTION INFORMATION NOTES 20 PROTECTION 20 SOME WORDS ON AMPLIFIERS 22 POWER 22 CURRENT RATING 22 AMPLIFIE
4. TD CONTROLLER PASSWORD A PP Ce SECURITY y A B Tar OI TD CONTROLLER CHASSIS LINKER 2 3 EARTH LIFT A B errors NAS DAN UDB 2 4 SENSE ORIN B Z l gt TD CONTROLLER RESTORE DEFAULT 2 5 DEFAULT VALS 2 1 Revision soft amp hard rev Displays the revision number of the LOAD DSP SOFTWARE FLASH BOOT HARDWARE Turn the encoder to access to the different revision screens 2 2 Security password The user password facility allows switching between free access unit locked and Change password The factory default password is NEXO This allows you also to get into an INSTALLER menu Please contact your NEXO dealer if access required 2 3 Earth Lift CHASSIS LINKED CHASSIS LIFTED Earth Lift information is stored in the user set up and automatic save set up It will keep the same state when powering the unit on or off also in the event of mains failure 2 4 SENSE GAIN Allows switching between line level sense lines and amplifier level sense lines 0 or 18dB gain on the sense line 2 5 DEFAULT VALS Restores the factory defaults System related values like the AMP GAIN and AMP Power will not change USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER PAGE 15 24 MENU USER UTILITIES 2 6 AMP GAIN TD NA Adjustable from 20dB to 40dB nominal Amp Gain in 0 5dB i Chi ono gt steps for each channel 2 6 ANP GAIN eon
5. processor is placed in the amp rack an unshielded cable can be used USER MANUAL LOAD1_80 DATE 30 08 00 12 48 ENEE X14 PAGE 10 24 TD CONTROLLER GENERAL DESCRIPTION Amplifier gain evaluation This is used to determine the actual gain of the amp and adjust for possible temperature drift amplifier input potentiometer adjustment or failure of this amp This value is then compared to the user supplied nominal value and used for the displacement and temperature protection Remote sense Line input 18dB less than the amplifier gain is possible and allows performing remote sense At this time these functions need additional accessories currently under development Reset Holding down the three menu buttons A B 4 simultaneously will reset the unit Reset has the same effect as powering on and off the unit The unit will mute hardware for 5 seconds with all LED s on The unit will then return to the last set up automatically saved every 2 minutes Resetting the unit from the front panel is useful to change the cabinet family without powering off and on Press the three buttons to reset then let go of the swap button to enter into MENU 0 In that case you will have to keep the A 8 B Buttons until all LEDs light off Note that to execute a download you will have to physically turn the unit off and then back on See Download page 17 Mute Solo buttons Front panel direct access The Mute or Solo mode is select
6. 2 7 AMP POWER TD NA Allows you to enter a Nominal Amp RMS power into 8ohms 4 CHT 1300 urns 0Q Adjustable from 200 Watts to 5000 Watts in 50W steps for e 1 ARP POYER each channel Warning this power is specified into an 8 R Ohm load and does not represent the maximum power of ne the Amp Configuration select 3 1 System Config A 4 ALPHATO Se B1 M3 1 Sust En CONFIG PA A B a Changing a set of parameters within the same family is h made immediately and is barely audible USER MANUAL LOAD1_80 DATE 30 08 00 12 48 ENEE PAGE 16 24 mone NX24 VOLTAGE SELECTION AND FUSES Voltage selection and fuses Precautions Please ensure that the unit is set for the correct voltage for your local supply BEFORE use Operating voltage is indicated in the window of the main socket at the rear of the unit Power connection Connection is made by means of an IEC standard power socket The unit will operate with AC main voltage between 90Vac and 125Vac 50 60Hz in 115v mode and 180Vac to 264Vac 50 60Hz in 230v mode Please note that each mode requires a different fuse Before connecting to the main AC supply ensure that the fuse fitted is the correct type time lag T slow blow and rating 115V T400mA or 230V T200mA as indicated on the rear panel adjacent to the fuse holder 115 230 Switching Voltage Selection Change requires no special tooling and can be performed in the field by qualified service people
7. Headroom while the unit is operating making sure that the red Input Clip and DSP Clip LED s never flash The operation is sonically transparent and will not generate glitches while you are doing so 1 2 DELAYS Sub Main Global Each output channel can be delayed by up to a maximum global individual delay of 450ms 150m See page 8 The unit can display in FEET METRES SECONDS as required Delay is adjustable in 10cm 0 3ms increments The control pot will accelerate through the adjustments faster according to the speed of use 1 3 OUT Levels global HF MF LF SUB Adjust overall amp separate TDcontroller gain with this menu These gain controls are provided to adjust the tonal balance of the system by acting on separate channels You can also compensate for gain differences between different amplifiers Although the use of differing gain structure amplifiers in the same set up is possible it is not recommended Each of the individual or global gain is 6dB Step 0 5dB 1 4 Mute Solo Allows the user to switch the function of the front panel channel buttons between Mute and solo mode USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER PAGE 13 24 MENU USER UTILITIES eee TD CONTROLLER 4 PReser USER 1 5 SAVE SETUP A B TD CONTROLLER 4 PRESET 1 5 RECALL SETUP A B el TD CONTROLLER Ta gt nn GRAIN 0 0 08
8. corresponding cabinet that is selected User set up Following user delay adjustment is possible GLOBAL Affecting all channels at the same time delaying all the system for application as delay towers MAIN Affecting only CH3 amp 4 for passive set up and CH2 3 amp 4 for active channels delaying the main system if Sub basses are located behind it SUB Affecting only CH1 amp 2 for passive set up and CH1 for active setup delaying the Sub bass cabinet if main system are located behind it GLOBAL and MAIN SUB delays are cumulative up to 150m per channel about 450ms 500 feet Audio Input Output Balanced Audio Input The analogue inputs are on 3 pin female XLR connectors with positive and negative signal polarities on pins 2 and 3 respectively Pin 1 is coupled at high frequencies to the chassis using a capacitor to limit screen currents and to the analogue ground with a jumper link The input signal can be adjusted in MENU 1 1 HEADROOM in order to avoid clipping of the A D converter See corresponding paragraph MENU section USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER PAGE 9 24 GENERAL DESCRIPTION Balanced Audio Output The analogue outputs are on 3 pin male XLR connectors with positive and negative signal polarities on pins 2 and 3 respectively Pin 1 is coupled at high frequencies to the chassis using a capacitor to limit screen currents and to the analogue ground with a jumper link The
9. effective temperature to fall under the maximum usable value In order to avoid detrimental effects induced by very long release time constants coming from the temperature detection signal level being reduced for an extended period pumping effects the detection signal is modulated by another voltage integrated with faster time constants matching the sound level subjective perception This allows the controller to reduce the effective operation duration of the temperature limiter and make it sound more natural while the efficiency of protection is fully preserved and operation thresholds are unaffected kept as high as possible USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER PAGE 21 24 PROTECTION INFORMATION NOTES Physiologic Dynamic Control The so called Physiologic Dynamic Control is intended to avoid unwanted effects as a result of a too long attack time constant By anticipating the operation of the temperature limiter it prevents a high level Audio signal appearing suddenly then being kept up for a period which is long enough to trigger the temperature limiter Without this a rough and delayed gain variation would result which would be quite noticeable and unnatural The Physio control voltage acts independently on the VCA with its operation threshold slightly above 3 dB that of the temperature limiter and a low compression ratio its optimised attack time constant allows it to start operating
10. exe provided with each upgrade set of files must ALWAYS be used A NULL MODEM or LAPLINK cable is required to connect your PC RS232 serial port to the NX241 RS232 serial port Connection from NX241 RS232 9 Pin Serial Port to PC s COM port NX241 RS232 serial port PC COM port Receive Transmit care The NEXO download software is DOS compatible and has been tested on the following operating systems m Microsoft MSDOS V5 0 and above m DOS shell of Microsoft Windows 3 x m DOS shell of Microsoft Windows 95 m DOS shell of Microsoft Windows 98 m Macintosh DOS compatible shell Note Due to the way Microsoft Windows NT addresses serial ports the software does not currently run on any version of Windows NT DOS shell If you wish to use a machine that is running NT you will have to make a bootable DOS disk copy the downloader NXLOAD EXE and the corresponding USER MANUAL LOAD1_80 DATE 30 08 00 12 48 ENEE NA PAGE 18 24 TD CONTROLLER DOWNLOAD LOAD DLD files to the disk and restart your machine in true DOS using this disk If you have true DOS to create a bootable disk under true DOS type the following Format a s Instruction The files needed to execute your download will be provided as a ZIP file You will have to extract the content of this ZIP in a temporary directory using programs as Pkunzip or WINZIP not provided by NEXO Once extracted you should have access to the foll
11. given output SPL and therefore increases the maximum SPL achievable with the same amplifier Active equalisation also extends system bandpass especially at low frequencies where acoustical performance is limited by cabinet size Crossover section Crossover between different bands is tuned for every set up of every cabinet The crossover is designed to ensure the best phase alignment possible over the crossover overlap USER MANUAL LOAD1_80 DATE 30 08 00 12 48 PAGE 8 24 NX24 TD CONTROLLER GENERAL DESCRIPTION User set up Array EQ A basic Array EQ is currently implanted in the NX241 The cut off frequency of a Low shelving filter is factory tuned for each cabinet setup The user has access to the gain of this filter Some more sophisticated User EQ is currently under development They will require the use of the upcoming expansion board Please read the readme txt that comes along with every new software upgrade to track eventual changes Delay amp Polarity inversion Input to output delay without filtering is 1 4ms due to the digital processing This delay will prevent compatibility with analogue TDcontrollers ANALOGUE AND DIGITAL TDCONTROLLER SHOULD NOT BE MIXED IN THE SAME SYSTEM Factory set up Note that each output may contain a small phase adjustment delay at the crossover point Also a polarity inversion may be performed These adjustments are part of the factory set ups and are necessary to time align the
12. 2 80Hz ALPHATD S2 B1 M3 Configures Input B right to drive the SUB channel independently S2 63Hz AUX inB ALPHATD S2 B1 M3 Configures Input B right to drive the SUB channel independently S2 80Hz AUX inB 4 S2 cabinets Configures all four channels to drive the S2 cabinet crossover 63Hz S2 63Hz 4 S2 cabinets Configures all four channels to drive the S2 cabinet crossover 80Hz S2 80Hz Alpha E Family AlphaE STEREO Configures 2 passive Alpha EM 2 B1 18 or 2 Alpha EF in stereo ALPHAE Mono Configures one passive Alpha Em with one B1 18 bass and one S2 Sub AEM B1 18 S2 63 crossover 63Hz ALPHAE Mono Configures one passive Alpha Em with one B1 18 bass and one S2 Sub AEM B1 18 S2 80 crossover 80Hz PS Family PS8TD Wideband Configures PS8 cabinet in wideband position without sub NO SUB PS8TD Crossover Configures PS8 cabinet in crossover position with LS400 sub With LS400 PS10TD Wideband Configures PS10 cabinet in wideband position without sub NO SUB PS10TD Crossover Configures PS10 cabinet in crossover position with LS500 sub With LS500 PS15TD Overlap Configures PS15 passive cabinet in wideband position with LS1200 available With LS1200 PS15TD Crossover Configures PS15 passive cabinet in crossover position with LS1200 available With LS1200 USER MANUAL LOAD1_80 DATE 30 08 00 12 48 _ 8b Zl 00 80 0 3 LYA 08 LQVOT IWANVW Y3SN uoljo9 j s g nues ans 11d s nin JOsn NUS Buiddi
13. DC Set up configurations possible m STEREO PASSIVE MODE WITH or Without MONO SUB 2 independent passive cabinets L R SUB L CO OO DDC m STEREO PASSIVE MODE WITH STEREO SUB 8 MONO PASSIVE WITH 2 SUBS oo SUB L SUB R SUB1 SUB2 MAIN ii DOOD DO EEES m ACTIVE 4 WAY 8 ACTIVE 3WAY MONO SUB LF MF HF PERD 43 48 USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NX24 TD CONTROLLER PAGE 7 24 GENERAL DESCRIPTION m ACTIVE 3 WAY plus AUX SUB on INPUT B L R SUB LF MF HF pre EJ ee CE m STEREO ACTIVE 2 WAY LFL LFR HF L HF R Subsonic and VHF filtering Equalisation amp Filtering Low and high pass filters are used to filter out frequency components that could possibly degrade the performance of the TDcontroller and amplifiers The filters are optimised to work in conjunction with overall system response The high pass filters are also extremely important as they optimise excursion at very low frequency which is a very important safety factor So do not use set ups which are not designed for the cabinet you are using Equalising acoustical response This equaliser section achieves the correction required to obtain a flat system response as the cabinets are acoustically designed for maximum efficiency on the whole frequency range Active rather than passive attenuation allows the lowering of amplifier voltages for a
14. DISCONNECT MAINS POWER TO THE UNIT then follow these instructions e Open the fuse holder window in the power entry module located on the rear of the unit External access APPLY FORCE ONLY TO THE SHOULDERS NOT TO THE CONTACT FINGER IN THE MIDDLE e Remove the red fuse holder and insert the corresponding fuse 115V T400mA 230V T200mA for the voltage required into the opposite side of the holder e For safety reasons when the fuse holder is flipped around for voltage changing the conversion clip Small metal contact should be re installed to the other side of the fuse holder Otherwise the fuse holder will not go back into the housing completely and the power entry module will not function The proper location of the conversion clip can be VOLTAGE SELECTION checked in the following way It should be located to the left hand side of the voltage number selected i e with the voltage label upright See Le diagrams opposite PROPER CLIP LOCATION e Re insert the red fuse holder the required voltage figure can now be seen in the fuseholder window e The unit is now ready for use USER MANUAL LOAD1_80 DATE 30 08 00 14 38 NOA TD CONTROLLER PAGE 17 24 DOWNLOAD Download Warning Information concerning downloading in this manual are general instructions Please read the specific instructions that come with each new LOAD readme txt file The latest version of the downloader program NXLoad
15. PS Front Panel Menu A and Menu B buttons 16 characters by 2 lines display Select Wheel amp Enter button 4 IN Clip DSP Clip red LED s Speaker Protection yellow LED for each channel Individual Mute Solo buttons and red LED for each channel Amp Sense amp Peak green 8 red LED s for each channel FLASH EPROM Upgrade for software improvement new cabinet set ups available on NEXO web site Rear Panel 115 230 V switch Fuse holder RS232 connector for serial com Empty slot for extension card communication amp processing power Dimensions Weight 1U 19 Rack 230 mm 9 Depth 4 kg USER MANUAL LOAD1_80 DATE 30 08 00 12 48 USA NEXO USA Inc 2165 Francisco Blvd Suite E2 San Rafael CA 94901 Tel 1 415 482 6600 Fax 1 415 482 6110 Email nexousa aol com France NEXO S A 154 All e des Erables ZAC de PARIS NORD II BP 50107 F 95950 ROISSY CDG CEDEX Tel 33 1 48 63 19 14 Fax 33 1 48 63 24 61 Email info nexo fr UK NEXO limited 9 Lyon Road Walton on Thames Surrey KT12 3PU Tel 44 1932 886 007 Fax 44 1932 886 008 Email info nexo sa com FAR EAST NEXO Far East Ltd 101 Lorong 23 Geyland 06 04 Prosper House Singapore 388399 Tel 65 742 5660 Fax 65 742 8050 Email info nexo sg com
16. R GAINS 22 GAIN VALUE 23 ADVANCED PROTECTIONS 23 TECHNICAL SPECIFICATIONS 24 ENE NA PAGE 2 24 TD CONTROLLER QUICK START e This section contains a summary of most frequently asked questions by people who haven t read the manual You may be able to use the NX241 TDcontroller quite quickly as it has been designed to be user friendly However please devote some attention to reading this manual A better understanding of some specific features of the NX241 TDcontroller will help you to operate your system to its full potential e Please ensure that the unit is set for the correct mains input voltage BEFORE use e WARNING Information on the amplifiers used is MANDATORY Before using your system you MUST configure MENU 2 6 AMP GAIN and MENU 2 7 AMP POWER Failure to do so or to properly connect the Sense Lines will invalidate the NEXO warranty on the attached NEXO loudspeakers RESET You can reset the unit without powering off by simultaneously depressing buttons A B amp SWAP lt gt at the same time Selecting cabinet family Simultaneously depressing A 8 B buttons at A C power up or during device RESET accesses the system change menu Keep the A amp B Buttons until all LEDs light off This will enable the selection of any cabinet in any family Using the rotary encoder scroll through the configurations and press enter 4 gt to load the required settings Select your cabinet set up In MENU 3 0 you wi
17. e the number of cabinets considered for the application 2 speakers per channel instead of one 4 instead of 2 and modulating at high level onset of clipping If the signal does not noticeably deteriorate the amplifier is well adapted overheating after approximately ten minutes is normal but thermal protection must not operate too quickly after starting this test Amplifier gains As you already read in the Quick Start section Information on the amplifiers used is MANDATORY This value is the key of a correct setting It is very important to know the gain of all amplifiers present in your set up The tolerance shall be about 0 5 dB In practice this can be difficult to achieve e Some amplifier brands have an identical input sensitivity for models of different power rating this means DIFFERENT GAIN for each model This problematic practice inherited from non professional applications is easily detected when the manufacturer specifies the same input sensitivity for all its range like 775mV OdBm or 1 55V 6dBm This translates to very high gain values on higher power models e Other brands do offer constant gain but only within a given product range like higher gain on all semi professional amps e Even if a manufacturer is conscious of this problem and applies the constant gain rule to all its models the value he chooses is not necessarily the same as other manufacturers e Some manufacturers can deliver products where manufactu
18. ed in the user menu Please note that these MUTEs are soft mute and are therefore not operating output relays Display amp Indicators User control of all settings is via two menu scroll pushbuttons an additional assignable pushbutton an assignable rotary encoder and a backlit 16 2 character display Three LED s per channel for sense green peak limit red protects yellow Four dedicated LED s are situated alongside the associated MUTE SOLO button Two LEDs to indicate input overload and signal clipping into the DSP Default screen will pop up after 2 minutes and display the current set up Serial link Downloader The unit can be RS232 linked to any PC in order to download new versions of software using a DOS compatible Downloader program See Download page 17 USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER Cy Q PAGE 11 24 MENU USER UTILITIES TD CONTROLLER e not MIN 4 LOAD ILl gt ICI NEXO 1999 ee A A Menu User Utilities On the controller display screen the number before the Function corresponds to the Menu Number To change the first number this is the Main menu label button A must be pressed To change the second number this is the Submenu label button B must be pressed To select options turn the encoder wheel or press the swap button 4 Changes are immediate no validation is required unless clearly stated Please ref
19. er is protected in temperature and displacement but there could be other factors of destruction that cannot be predicted by simulation especially mechanical damage to the cone Each driver is specified for a certain power handling and a factory set peak limiter threshold is tuned to avoid any abuse USER MANUAL LOAD1_80 DATE 30 08 00 12 48 ENEE NA PAGE 22 24 TD CONTROLLER SOME WORDS ON AMPLIFIERS Some words on Amplifiers Power NEXO recommends high power amplifiers in all cases Budget constraints are the only reason to select lower power amplifiers If an incident occurs on an installation without protection the fact that amps only generating half their rated output power 3dB are used will not change anything in respect of possible damage This is due to the fact that the RMS power handling of the weakest component in the system is always 6 to 10 dB lower than the amps ratings Current rating It is very important that the amplifier behaves correctly under low load conditions A speaker system is reactive by nature on transient signals like music it will require much higher instantaneous current than its nominal impedance would indicate four to ten times more Amplifiers are always specified by continuous RMS power into resistive loads which is irrelevant the only useful information in that respect is the specification into a 2 ohms load It is possible to make an amplifier listening test by loading them with twic
20. er to the release notes issued with each new download to track eventual menu changes Main Family Selection TD CONTROLLER NX 4 ALPHATO 5c D1 A B Changing Cabinet Familv In order to prevent end user changing between different NEXO svstem set ups during use the following procedure is obligatorv This procedure has been purposelv designed to avoid any mistake It is nevertheless very easy to change set up among the same family see menu 3 Simultaneously depressing A amp B buttons at A C power up or a device reset accesses the system change menu You can reset the unit without powering off by simultaneously depressing buttons A B 8 SWAP 4 at the same time Note Selecting a new family will set all parameters to factory default settings USER MANUAL LOAD1_80 DATE 30 08 00 12 48 PAGE 12 24 NOA TD CONTROLLER MENU USER UTILITIES TD CONTROLLER moy I EEEE MAX 1 1 MT 1 1 HERDROON CEA N TD CONTROLLER r r n lt GLOBAL UDS t el rn I WELAYS A B Teer TD CONTROLLER OO TD CONTROLLER MIT 4 MWe 1 Mire I MUTE 3010 Ili A B 1 1 HEADROOM Allows the user to adjust the headroom 4 steps 6 0 6 12 before the A D converter without changing the overall gain of the processor Factory default is set to maximum headroom and so maximum noise This can be adjusted if you feel the processor is too noisy for lower level applications Adjust the
21. lO ISO gt sjeuueyy dems uol 9 s y NUSJA UIEN LL d suopnq OOS AINA 11d sJoyeoipu 9 Aejdsiq LL 11d s nilnn JSN nue SON JOSN NUAN g v Q W31SAS VHd1V e O J poou JeJOy usa19 JEUBIS asuas pay BuiddilO ynduy MOJJSA UOJ99J014 11d s nin 1 sn nue pay Bupu yeod LL d SJOJEDIPUT 9 Aejdsig 11d SIOJEDIPUT y Aejdsig joueg ju014 Lo T T t po iE e 1V343N39 NOLLdAIY9S30 TVIINID Y3TIOYLNOD GL DIH 39Yd IP X pcre 8v Z1 00 80 0 3 LYA 08 LQVOT IVANVW 4asn 6 d saul asuas 1 ploH sn3 440 NO 1 MOd Z gd 8490S 931 L duj olpny pasuejeg 6d mamo o pny pasuejeg g d sasnj pue uon9ajes SDEJJOA Eewa TRE BOS yy 701 y MOT 7H9IH U HOIH aPSogs 83 o76 1337 HOM e e e eee ER e 6 dt Dr Dore Bune 9 d I sn4 eue yue eog uoisuedx joued JUEjq pieog uo 3 Mod ESS ZEZSY 91 d sesn pue uonoajas SDEJJOA 21d peojumoq joueg 1294 NOILdINOSAd TWHINJD velg 39Vd YAITIOYULNOD GL yo tal ENEE NA PAGE 6 24 TD CONTROLLER GENERAL DESCRIPTION Configuration Global architecture is based upon a full 24 bit audio path with 48 bit core calculator running at 100 Million Instructions per Second Featuring m 2 analogue inputs balanced 24 bit resolution ADC m 4 analogue outputs balanced 24 bit resolution DAC m 4 sense inputs unbalanced 18 bit resolution A
22. lifier will proportionally raise the noise floor level by the same amount Advanced protections Some high end amplifiers may have some advanced functions like those found in the NX241 TDcontroller loudspeaker offset integration limiter compressor These functions are not well adapted to specific system requirements and may interfere with existing protection within the TDcontroller NEXO do not recommend using these functions with the NX241 TDcontroller USER MANUAL LOAD1_80 DATE 30 08 00 12 48 ENE Y PAGE 24 24 TD CONTROLLER TECHNICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS SPECIFICATIONS NX241 Digital TDcontroller Output Level 28 dBu Max into 600 Ohms load Dynamic Range Channels 1 8 2 99 dBu Channel 3 amp 4 typical 107 dBu Flat without gain scaling 101dBu THD Noise lt 0 02 flat setup max0 04 for Output 27 5dBu Latency time 1 4ms on a flat setup Power Supply 115 230 Volts 50 60 Hz operating range 90 125V amp 180 264V FEATURES Audio Inputs 2 Audio Inputs 24 bit converters Electronically Balanced 36 k Ohms 2 XLR 3F Connectors 4 Amplifier Sense Inputs LF mono MF HF L amp R Floating 150 kQ 18 bit converters 8 Pole Removable Strip Terminal Sense Inputs Audio Outputs 4 Audio Outputs 24 bit converters Electronically balanced 50 Ohms 4 XLR 3M connectors Processing 24 bit data with 48 bit accumulator 100MIPS Optional Expansion Board 300MI
23. ll be able to choose among the different set ups within the same cabinet family i e you don t have to modify the amplifier to cabinet wiring Navigating Menus On the controller display screen the number before the Function corresponds to the Menu Number To change the first number this is the Main menu label button A must be pressed To change the second number this is the Submenu label button B must be pressed To select options turn the encoder wheel or press the swap button 4 Changes are immediate no validation is required unless clearly stated Back to default In Menu 2 5 you have the possibility to put back all MENUS to the factory default except the amplifier information that you have entered MENU 2 6 amp 2 7 Auto save The current set up is saved in case of power failure every two minutes after the last change At power up this set up is restored USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER PAGE 3 24 LIST OF SUPPORTED PRESETS LOAD1_80 List of Supported presets LOAD1_80 At the time of printing the following factory presets are supported by LOAD 1_80 Please refer to the release notes if the software loaded in your NX241 is not LOAD 1_80 Alpha Family ALPHATD B1 M3 Configured Input A to drive a 3 Way Alpha System ALPHATD S2 B1 M3 Configured Input A to drive a 4 Way Alpha System SubTD S2 63Hz ALPHATD S2 B1 M3 Configured Input A to drive a 4 Way Alpha System SubTD S
24. output will deliver a full scale output of 28dBu balanced 6000 1nF load During A C power up of the NX241 all outputs are muted by firmware controlled relays strapping pin 2 and pin 3 of each output Connecting the audio outputs Output stages are able to drive several amplifiers in parallel however it is not advised to work with loads of less than 600 Ohm It is best to check with the impedance characteristics of the inputs supplied by the manufacturer to check if the number of amplifier channels is acceptable Where precise information is not available and taking 5 kQ as the minimum expected value then seven channels in parallel per output is a conservative maximum In the case where input impedance is 20kQ it puts this value up to 30 amps channels General Functions System Protections The following protection functions are performed See Protection Information Notes page 20 for a complete description As the NX241 TDcontroller is common to all NEXO cabinets see also the release notes corresponding to each software revision for an update of the following list Temperature Protection m Displacement protection m Peak limiting m Interchannel regulation m Physiologic Dynamic Control Sense lines Recommendations for sense line wiring The Input impedance of the TDcontrollers Sense inputs is very high current is thus very low although voltages are high lt is therefore not necessary to use a special type of cable If the
25. owing files e Two download DLD files the last official release version and the newly released version If you experience any problems with the new version simply load back the old DLD program to return the unit to the previous version e A README TXT that will contain download instruction e WHATSNEW TXT which will inform you with all new features of the new LOAD e The downloader program NXLOAD EXE Execute the following procedure to load the new software into the NX241 Flash EPROM 1 Connect the serial cable to both computer and NX241 2 Execute your DOS shell or start your machine from DOS 3 At the DOS prompt type the start command for the loader in the directory containing the files The correct syntax is as follows NXLOAD filename COMport_number lt ENTER gt e g NXLOAD LOAD1_80 DLD 1 The downloader works with Com Ports 1 and 2 only Com 3 and 4 cannot be used 4 When you press lt Enter gt to invoke the command the following message appears on the computer screen Loading file Waiting for NX241 Note If the message is followed by a string of strange characters it is possible you have entered the incorrect Com Port number Hit ESCAPE to abort the procedure and start again If nothing happens make sure that the cable is correctly wired and your computer COM port actually DOES work before trying again You can also try re booting your machine 5 Now to complete the procedure you must set
26. ring tolerance on the same model is 1dB or more Worse he can agree to modify this gain at the customer s request without clear and visible identification on the device Some amps feature internal gain switches and it is sometimes impossible to know the amp gain without measuring or opening it USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER PAGE 23 24 SOME WORDS ON AMPLIFIERS In cases where you don t know the gain of your amplifier or want to check it please read the following instructions 1 Unplug any cabinet from the amp 2 With a signal generator feed a sine wave freq within the audio range 1000Hz for example Amplitude Vin is not important 1V is rather convenient Unless if you use 0 7V sensitivity where you will overflow the amp input 3 Measure the Amplitude Volt at the output of the amp 4 Gain 20 LOG10 Vout Vin 5 Some examples 37dB 1 4V sensitivity 1350Wrms 0 1V 1V 2V 4V 7 1V 0 5V 5V 10V 20V 35 4V 1V 10V 20V 40V 70 8V Remember that constant sensitivity settings will give you different gain value when the amp Power is different Gain value NEXO recommends low gain amplifiers 26dB is recommended as it is at the same time adequately low and quite common This considerably improves signal to noise ratio and allows all preceding electronic gear including the TDcontroller to operate at optimum level Remember that using a high gain amp
27. the NX241 to Download mode to make it ready to accept the program USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA TD CONTROLLER PAGE 19 24 DOWNLOAD Power the TDcontroller OFF and then back on whilst holding down the MUTE button of channel 1 leftmost mute The controller will now enter Download mode and the download will start The address of the code being loaded will be displayed on both the computer screen and the NX241 whilst the process is in operation The download procedure is complete when the unit resets all LED s on 6 The NX241 now HAS to be reset AGAIN to enter the configuration menu Turn the unit OFF wait 5 seconds and then power back ON or hold down simultaneously the three menu buttons A B 4 gt Hold down the two menu buttons A B to enter into the Configuration Menu to choose your cabinet The unit is now ready for use USER MANUAL LOAD1_80 DATE 30 08 00 12 48 NOA PAGE 20 24 TD CONTROLLER PROTECTION INFORMATION NOTES Protection Information Notes Protection VCAs and VCEQs Each channel has its own simulation and protection process Each audio channel contains a combination of controlled gain stages let s call them VCA s as in our analogue circuitry These VCA s are embedded into complex composite structures in order to change their basic operation into frequency selective attenuation This operation is similar to that of a voltage controlled dynamic equaliser VCEQ
28. without any subjectively unpleasant transient effects Interchannel regulation As described before each transducer is individually servo controlled for temperature This means in practice that in case of a potential risk detected protective operation would only affect the concerned driver Your driver will be protected but the overall system tonal balance could be altered if the different channels are not heating at the same time In addition triggering a temperature protection means that the loudspeaker has already lost some efficiency power compression up to 3dB in extreme cases The purpose of interchannel regulation is to cancel that effect by linking VCAs together When the protection is activated on one channel and reaches a predetermined threshold the regulation section begins to correct the balance between the different channels HF MF and LF by acting on the concerned VCA Peak limiter The peak limiter primary function is to avoid massive clipping of the amp which can have some very audible artefacts and in some cases may be dangerous for the Cabinets Modulation of the amplifier s rails can create very low frequencies not filtered at all by the NX241 or some harmonics at high frequency and level The threshold of the peak limiter is determined by the user to match its amplifier 3 MENU AMP POWER and AMP GAIN The second function of the peak limiter is to avoid huge amounts of power being sent to a driver Each driv
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