Ashly MOS-FET POWER AMPLIFIERS FTX-SERIES User's Manual
Contents
1. out of phase speaker terminal CAUTION NEVER CONNECT THE TWO RED BINDING POSTS TOGETHER OR CONNECT EITHER RED BINDING POST TOA BLACK BINDING POST Output Ph BSE pny Modes mtd 123 7 High FR so o ttt Seg nstalied Level aa i Level 360 180 om Erossaver 4 o eki oS 10 o p requency pet i i Not Monde A L Seat i 2 d Lew High FPA nal oe a AAN O Low Low Ply A ay 3 Bridged Low es vas ater if gt k IS P e Hz fi Highpass ne tiie Full Range Of p EAUTION Never Send Full Range ASHLEY bl a To High ae Drivers POWERCARD Input Option Ground Two Way 24 8 Oct Ne oO Oo Go 7 Crossover i ong eS Len calles l AN ia gt g x x x gt KC Seat i i Auri ed input aaa Vege l Level a Aux Aux Balanced input _ oer Low Out High Out Pre Level Pre Leval Pin 2 Hot Figure 8 Crossover Input Option p Microphone Inputs Meng Master Stereo su Norm i sie 2 Level Mono Bridge ie 19 0 16 oy fy XL N ASHLY 3 MM 6 POWERCARO input Option f Mic Line Mier 1 Mic 2 Levei iowlut 2 Mics Only Cht h2 Ch3 Chd Y Lame Lire Level Line Inputs insert Points L Amplifier Channe 1 Output Post Master Level R Amplifier Channel 2 Output Mone Mode Sums the Stereo Signais Figure 9 Mic Line Mixer Input Option SSSSHHSSSSHOSHSHSHSHHHGSHTSHOHHHHHEHSHCHOSGHSHHOHHHHOHSCHSTOGOHGCSHOSHHHROSHTHEOHETOHOHSHEOHHOGEHHOOEAEOLD Ashly FTX C2. not notified promptly and if the shipping carton and packing materials are not available for inspection by the carrier Save all packing materials until the claim has been settled POWER Connect the FTX series amplifier to a standard 3 wire grounded electrical outlet supplying 120 volts 50 60 Hz some export models are wired for 240 volts The power consumption is given in the specifications section STANDARD CONNECTIONS AND CONTROLS The rear panel of a FTX 2000 amplifier with the standard input panel is shown in figure 1 For descriptions of other input options available see the section on input options DIMENSIONS ee JEO 1 ernennen SA i i FTX1000 FTX 1500 P76 400 Amplifiers j 3 0 3 5 e A os EN an AE E EEE EEN EE 18 375 memean Se EE ie FFX2000 P70 800 Amplifiers Cc L 2 i SOSSHHSHSOOSHSHSHHHOSHHSSAGCHHSHTTHTSHSHOHHSCHHOHOHOSSHHOOOHOSHHEHSHEHHSESHHKHHSHOEHHOHHEOOORHETOEHODEED Ashly FTX CFT Owners Manual Page 2 Ashly FTX CFT Owners Manual Page I DESIGN THEORY Ashly FTX series amplifier circuits are totally discrete using high voltage wide bandwidth electronics The input section is a complimentary Darlington differential amplifier stage for high common mode rejection low noise and low distortion All voltage gain stages in the amplifier operate class A for low distortion The quasi complimentary MOSFET output stage has almost infinite curren
3. be It is recommended that balanced input connections be used when possible to reduce ground loop and environment induced hum and noise If an unbalanced input connection is used then the connection XLR pin 3 should be connected to input ground XLR pin 1 If the 1 4 input jack is used unbalanced the use of a mono tip sleeve plug will automatically tie the connection to input ground PHFSFCSSSSCSHSHSHOSHSSHSHSHSSCHHSHSSHCHSSHCHHFSSGSHASHHOSHHAHHOGSHHRSHOHHHSHSSHSHAHGHOHSCHOHSHOHHSHOHSCHSHHSSHRHOSHSHSHMHOOHHOHOECHOHOHBASHLOSHHOE Ashly FTX CFT Owners Manual Page 10 Ashly FTX CFT Owners Manual Page 3 The CHASSIS GROUND terminal is internally connected to the chassis the AC earth ground and the power amplifier s signal ground The INPUT GROUND terminal is tied to the XLR pin and the 1 4 jack sleeve It is recommended that the input and chassis ground terminals remain connected with the factory supplied jumper strap In situations where the power amp and its signal source are separated by great distances a ground voltage difference may exist between the amp s chassis ground and the inputcable s ground Connection of these two grounds through the jumper strap may cause large ground currents to flow which is known as a ground loop causing a hum noise in the amp s output Unless you have such a situation with a hum problem that cannot be solved by using balanced input connections the ground jumper stra
4. with fan cooling provide plenty of thermal headroom The CFT 1800 utilizes quiet convection cooling for studio control rooms home hi fi and other applications where low ambient noise is essential Like the FTX series the CFT 1800 is a modular design for ease of servicing Because of the passive cooling in the CFT 1800 thermal headroom is somewhat reduced from that of forced air cooling thus making it inadvisable to drive 4 ohm loads at continuous high power with this amplifier It is also important to allow for free air circulation above the amplifier to achieve optimum cooling action Figure 1 FTX 2000 Rear Panel With Standard Input 1 INPUTS The standard input panel of the FTX series amps is equipped with balanced 1 4 tip ring sleeve TRS phone jacks balanced XLR jacks and balanced screw terminal inputs The three types of connectors are internally wired in parallel and may be used with balanced or unbalanced connections The inputs are configured for pin 2 hot meaning that a positive voltage applied to pin 2 will result in a positive output voltage across the speaker terminals Pin 2 of the XLR jack is equivalent to the tip of the 1 4 TRS jack as shown in figure 1 An optional plug in input transformer is available on all FTX amplifiers Stereo Phom Mog aw ube tar balancer Masmi Phone Plog tested tor uetbalany qe F igure 2 Input Connectors eubered in the 2e l i i Pins ote t comedian 3 Loo nen
5. ASHLY owner s manual FTX SERIES CFT SER IES MOSFET POWER AMPLIFIERS ASHLY AUDIO INC ASHLY FTX REV 01 0693 lower than their maximum rating The MOSFET will even withstand a dead shorted output resulting in very high drain current without any protection circuitry for a very short time MOSFETS also do not have a storage time associated with them a phenomenon found in bipolar transistors in which a certain amount of time is required to turn the transistor off Therefore the MOSFET is said to be a fast device which can function very accurately with high amplitude high frequency signals and transient waveforms The unmatched reliability of the power MOSFET output devices and the integrity of the rugged mechanical design of the FTX series amplifiers ensure years of maintenance free service UNPACKING As a part of our system of quality control every Ashly product is carefully inspected before leaving the factory to ensure flawless appearance After unpack ing please inspect for any physical damage Save the shipping carton and all packing materials as they were carefully designed to reduce to minimum the possibility of transportation damage should the unit again require packing and shipping In the event that damage has occurred immediately notify your dealer so that a written claim to cover the damages can be initiated The right to any claim against a public carrier can be forfeited if the carrier is
6. Distortion 007 IKHZ 007 IKRZ 07 KHZ Dimensional Diagrams 8Q 01 20Hz 01 20Hz 01 20Hz e Aau OTRE ol R SPO CHCATLONS uae EAN Mea AAA i 12 IM Distortion 80 SMPTE OT 007 007 01 IHF 01 DI Damping Factor gt 25020HzIKHz gt 25020Hz 1KHz gt 250 20Hz IKHz INTRODUCTION Why MOSFETS Bandwidth 100KHz 100KHz LOOKHz Slew Rate 40V nS 40V uS 50V RS The Ashly FTX series MOSFET amplifiers combine the sonic excellence of i 3dB 20Hz 20K Hy z 2 WHz dy F Frequency Response 2dB 20Hz 20KHz 2dB 20Hz 20KHz 2dB 20Hz 20KHz ahigh end stereo amp with the ruggedness and stamina necessary in pro audio The Full Power Input Sensitivity 1 1V LIV LL7V Hum and Noise gt 100dB below full output gt 100dB below full output gt 105dB below full output 20Hz 20KHz unweighted Power Requirement FTX series amps use power MOSFETs metal oxide semiconductor field effect transistors for their superior audio fidelity and unmatched reliability as proven in Ashly amps for over ten years The CFT 800 is a convection cooled but electrical equivalent of the FTX 1500 MOSFET output devices are used in the FTX series amps because of their superior performance characteristics over bipolar power transistors which are normally used in conventional power amp designs The power MOSFET is inherently more self regulating and does not exhibit the failure modes that bipolar transistors are susceptible to MOSFETS do not re
7. FT Owners Manual Page 4 Ashly FTX CFT Owners Manual Page 9 CROSSOVER INPUT OPTION The crossover input option provides fixed frequency 24 dB octave high pass and low pass filters allowing the two amplifier channels to operate bi amped full range with low out bothchannels low out or bridged low out Auxilliary low and high outputs are available for connecting additional amplifiers Included with the crossover input option are single in line package SIP resistor networks which allow preselection between standard crossover frequencies of 160Hz 500Hz and 1 2KHz 360 of phase control is provided for proper acoustical alignment of high and low frequency drivers Constant Directivity Hom EQ is provided for both small and large hom designs A 3rd order 20 Hz high pass filter is included on the low frequency crossover output to remove inaudible subsonic signals MIC LINE MIXER INPUT OPTION The mixer input option provides four high impedance line inputs and two balanced low impedance microphone inputs each with its own level control A _ switchable 200 Hz high pass filter is provided on the mic inputs to reduce unwanted low frequency noise An internal jumper allows selection of 15 Volt phantom power applied to the mic inputs for use with condenser mics The option has a master level _ control and selectable stereo mono and bridging modes Insert Points are available _ for patching external processing into the left and right channel
8. ach channel allowing fully discrete stereo limiting operation SHSSSSHOHSSSHSHSHSHOSHHOHSESHSHSHSCSSHHSSHSHSHSSHSHSCHSHSHSSHSHHSHSHSHSHSSHSSHSHSSHHSHOSSESSOHOSHSRSKHSHEHSEHSHOSSESOESTERHOGES Ashly FTX CFT Owners Manual Page 6 Ashly FTX CFT Owners Manual Page7 SPECIFICATIONS Output Power EIA Spec 1dB lt 1 THD 20Hz 20KHz Stereo Rated Per Channel 20Ohms 4Ohms 80hms Mono Bridged 4 Ohms 8Ohms FTC Spec min power lt 01 SMPTE IMD 8 lt 02 IMD 4 Stereo Rated Per Channel FTX 1000 190 Watts RMS 120 Watts RMS 380 Watts RMS FTX 1500 360 Watts RMS 260 Watts RMS 600 Watts RMS FTX 2000 ASFILY MOSFET POWER AMPLIFIERS Models FTX 1006 FTX 1500 FTX 2000 and CFT 1860 675 Watts RMS 500 Watts RMS TABLE OF CONTENTS 300 Watts RMS 1350 Watts RMS Introduction seissen iarere iieu aiia isina iiie 1 1000 Watts RMS Standard Connections and Controls 0 cccccccseeeeeee 2 Typical Applications 0 0 ci ceccseecseseeseseeseneeestseseeseseseenens 5 Input OPWOns na cates rah aaaased deen dil 7 Transformer Input Option 4Ohms 160 Watts RMS 275 Watts RMS 400 Watts RMS Limiter Input Option oenina aaan aan 8 Ohms 100 Watts RMS 175 Watts RMS 250 Watts RMS Crossover Input Option Mono Bridged apts pE SP i 8Ohms 320 WattsRMS 550 Watts RMS 800 Watts RMS Mic Line Mixer Input Option e mma Design Theory paierai ar Taa i ptei iait Total Harmonic
9. ing mode not to exceed the power handling capability of the speaker and the minimum load impedance on the amp INPUT OPTIONS Inputoption panels are available to provide built in features such asa stereocompressor limiter a mic and line mixer a crossover for bi amplified systems and input transformers for signal isolation Ashly FTX series amplifiers as well as all other Ashly amps excluding the single rack space SRA 120 will accept Ashly input option panels A brief description of currently stocked input options follows Consult your dealer for detailed information on the input options or call the factory TRANSFORMER INPUT OPTION The input isolation transformer can be installed directly into the standard input supplied with every ASHLY amplifier except for the single rack space SRA 120 No soldering is necessary The input transformer provides complete electrical isolation from the amplifier and its signal source to eliminate any ground induced hum noise The transformer input also further reduces any common mode noise and radio frequency interference The transformer option must be installed in the standard input panel and does not change the operation of any switches or controls LIMITER INPUT OPTION The limiter input option provides peak signal limiting from excessive input levels for speaker protection and overall level control Separate limiter threshold controls limit indicator LED s and limit on off switches are provided on e
10. p should remain in place 2 NORMAL BRIDGING SWITCH This switch selects between NORMAL mode in the out position where both channels are in phase and BRIDGING mode in the in position where channel 2 is switched out of phase In bridging mode the channel red binding post is the in phase speaker output terminal and the channel 2 red binding post becomes the out of phase speaker terminal To make the switch non accessible its gray button is removable by simply pulling it straight off 3 STEREO MONO SWITCH This switch selects between STEREO mode in the out position and MONO mode where channel input is routed to both channels of the amp in the in position In mono mode an input signal needs only to be connected to channel 1 To make the switch non accessible its gray button is removable by simply pulling it straight off i 4 LEVEL CONTROLS The level controls allow attenuation calibrated in dB of the input signal In MONO mode the CHANNEL ONE level control affects both output levels and CHANNEL TWO level control is unused Itis recommended that the level controls are operated at full level 0 dB attenuation in most situations to maximize the headroom in the signal source 5 SPEAKER OUTPUTS A pair of dual banana binding posts provide the stereo speaker outputs In BRIDGING mode the channel red binding post is the in phase speaker output terminal and the channel 2 red binding post becomes the
11. quire any thermal runaway compensation circuitry thus making the design simpler and more reliable MOS FETS do not exhibit secondary breakdown an instantaneous failure in bipolar transistors when their collector current exceeds a safe level even at voltages much f 760 W Max 100W idie 1200 W Max 160W Idle 1800 W Max 220W Idle 120VAC 50 60Hz 120VAC 50 60Hz 120VAC 50 60Hz 240V available 240V available 240V available 19 Wx3 S HX17 8 D 19 Wx3 S HX17 8 D 19 Wx5 25 Axi 7 8 D Size 42 Ibs 47 Ibs 65 Ibs Shipping Weight SSSHSSCSSSOSSSSHODSESHSSHOFSHSSSHOSSSHASSSEHSHSHSSHSCHOSHSSHSEHOSSHSSHGHSHSKGCHSSHSHSSSHHOSESHSHOHSHTSSHSAOHSSCOBSHOSHSHOEHKSeESEES Ashly FTX CFT Owners Manual Page 12 Ashly FTX CFT Owners Manual Page
12. s iea Stereo BR Norm an ae ASHLY Thrasnold Hmi Mono tm Bridge Tugghole Lipit CL 2 sia eek EN as 1a ag O POWERCARD Input Option sg oe Me AOR at He Seog Stereo Limiter a yE Figure 7 Limiter Input Option Ashly FTX CFT Owners Manual Page 8 S OeeeeoeooeoSseSeeesae Sse oe ese Sooeseoeee Hee aeeeoveoeoese METERS The FTX amplifiers are equipped with front panel meter displays which respond to peak output voltage An eleven segment three color LED display covers a 27 dB range The green LED s at the left end of the meter arrays indicate anormal thermal status In the event that the amplifier overheats these LED s will turn off but the power switch will remain illuminated indicating the thermal protection status When the heat sinks return to safe operating temperatures the amp will turn itself back on and illuminate the left most green LED s In the event of a blown speaker fuse the meter display of the affected channel turns fully on THIS DOES NOT MEAN THERE IS DC AT THE OUTPUT ahs gf ibaa a icc gee cna mmm ASHLEY weiter O ED CESO O URE ED comme coum commie CIES TD enema ummm gt 5 aumo Ee emma hice EE xm E gt o a er figure 3 FTX 2000 Front Panel TYPICAL APPLICATIONS STEREO OPERATION Both Switches Out Channct Tao Figure 4 Operation in Normal Stereo Mode SSOoOSSOsOoSSSFHGOeseesoeseooeeseeoeoeoe ooo eeooe asd Ashly FTX CFT O
13. t gain therefore the output driver stages are nearly lossless All circuitry within the feedback loop is discrete which allows the amplifier to recover instantly and cleanly without any spikes or glitches from a clipped condition This overall design approach inherently assures low noise low distortion and excellent transient and overload response Inputs are bridging and active balanced and all input connections can operate as balanced or unbalanced Turn on delay relays are not needed because of the symmetry of the totally discrete complementary electronics The MOSFET output devices do not require short circuit protection and V I limiting circuitry thus enabling a simpler more reliable electronic design Rear panel accessible speaker fuses are provided to protect the amplifier from prolonged output shorts These fuses are wired within the feedback loop of the amplifiers to ensure that they do not alter the audio fidelity All electronic components are mounted to rugged glass epoxy circuit boards Large computer grade electrolytic capacitors assure long service The FTX series amplifiers are packaged in a rugged 16 gauge steel chasses The power transformer is located at the front center of the chassis to minimize front panel torsion Each channel s electronics and heat sink are identical yet completely independent and modular each with a single plug in connector for ease of servicing Large custom black anodized extruded aluminum heat sinks
14. wners Manual Page 5 MONO OPERATION Meno Seite bn f i Channet One it Figure 5 Operation in Normal Mono Mode With the MONO switch depressed the channel input is routed to both amplifier channels Both channels are then controlled by the channel I level control Both outputs will be identical and can be connected to separate speakers CAU TION NEVER CONNECT THE RED BINDING POSTS TOGETHER BRIDGING OPERATION Both Switches in Figure 6 Operation in Bridging Mode To operate in bridging mode depress both the MONO switch and the BRIDGING switch The MONO switch depressed routes the channel input to both amplifier channels and the BRIDGING switch depressed inverts the phase of the input signal before it is fed to the channel 2 power amp section The two amplifiers outputs are therefore 180 degrees out of phase The channel red binding post is used as the positive speaker terminal and the channel 2 red binding post becomes the negative speaker terminal The black binding posts are not used CAUTION NEVER GROUND EITHER RED BINDING POST In bridging mode the output voltage applied to the speaker is doubled thus providing more power to a single speaker However each output channel sees just one half of the load impedance when in bridging mode For example connecting an 8 ohm speaker in bridging mode presents a 4 ohm load to each channel of the amplifier Use caution when operating in bridg
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