Grace Design m103
Contents
1. n TRIM 4 gt CO t gt o gt 1 EQ COMP e O EQ AMPLIFIER EQ gt COMP EQ gt COMP O OPTICAL LEVEL CONTROL MAIN OUT UNBALANCED SIDE CHAIN LINK MIC PRE OUT BALANCED 12 lodB GAIN 6548 instrument 108k Save dm 9 750 E 3k 20k lo gain lo freq mid gain mid mid Q hi gain hi freq unbalanced stereo link o 38765432 E 7 5 3 4 CR MH 2 3 o eg gt COMPG comp SEP 5 5 E 200 03 E threshold attack release ratio IOdB TRIM ES IS ED 13 100 240VAC Coni m 5W MAX BOULDER CO USA WWWGRACEDESIGN COM UNK IN sidechain MAIN OUT MAIN OUT MAIN OUT LINE IN additional m103 for stereo compression or external sidechain input for de essing ducking etc iagram D iring W instrument amplifier mixer pa system microphone output input recorder converter daw soundcard interface 14 Specifications MIC AMP SECTION MEASURED AT MIC AMP OUTPUT GAIN RANGE 54 steps Mic input 10 65dB Hi Z input 10 45dB THD N 1kHz 22Hz 22kHz BW 20dB Gain 20dBu out lt 0 00085 40dB Gain 20dBu out lt 0 0010 60dB Gain 20dBu out lt 0 0050 INTERMODULATION DISTORTION 40dB Gain 20dBu out SMPTE DIN 4 1 7kHz 50Hz 0 0020 NOISE REFERRED TO INPUT 60dB Gain 22Hz 22kHz BW 500 source lt 130dB 150Q source lt 128dB 6000 source 124dB CMRR 60dB Gain 3 5Vcm 100Hz gt 60dB 1kHz gt 75dB2. This switch selects the low EQ response mode between shelving gt and 4 peak MID GAIN EQ section This knob controls the amount of cut or boost applied to the selected mid frequency from 12dB to 12dB MID FREQ This knob selects the frequency of the mid band EQ from 5kHz to 4kHz MID Q This knob controls width sharpness of the mid EQ control with a range from 5 the widest with the most effect on adjacent frequencies to 5 the sharpest with the least effect on adjacent frequencies HIGH GAIN This knob controls the amount of cut or boost applied to the selected high frequency from 12dB to 12dB HIGH FREQ This knob selects the frequency of the high band EQ from 3kHz to 20kHz HIGH frequency EQ type switch This switch selects the high EQ response mode between shelving gt and peak EQ IN SWITCH This switch activates the EQ circuit The LED above the switch illuminates when the EQ is active turns off when deactivated This switch controls a gold contact relay EQ COMP Peak LED displays peaks within 6dB of internal clipping in the line section EQ COMP COMP EQ This switch selects the order of the EO and Compressor circuits TRESHOLD This knob sets the minimum level at which the compressor circuit is activated with a range of 15dB to 15dB ATTACK ms This knob sets how quickly or slowly the compressor circuit attenuates the incoming signal RELEASE sec This knob sets how quickly or s
3. depends on the character or envelope of the signal entering the compressor If the signal has sharp or fast attack percussive sounds snare drum that you wish to attenuate select a fast attack rate to sense the initial impulse of the signal and attenuate it in time If you want the compressor to react slower and not attenuate the initial impulse of the signal select a longer attack time Using a slower attack time may be more appropriate with signals with a slower more gradual envelope strings woodwinds SETTING THE RELEASE RATE The rate at which you want the circuit to release its attenuation of the signal release phase is set with the release control This is the functional opposite of the attack control If the signal has a shorter decay it may be best to set a shorter release time A helpful approach to setting the attack and release time may be to consider the basic pulse of the signal you re compressing To avoid the typical artifact known as pumping where you can clearly hear the compressor working it is important to set the attack and release times to match the signal to where they are moving naturally with the dynamic fluctuations of the signal SETTING THE RATIO The compressor s ratio control is used to set input output ratio of signals above the threshold For instance a setting of 3 1 means that if the incoming signal is 3dB over the threshold level that signal will leave the compressor around 1dB over the threshold lev
4. dynamic range compression is a subjective tool there is no wrong way to use it However using a compressor in a way that produces the best results can be complicated and again the more you know the better it will work If you are unsure about how a compressor works we highly recommend some reading en wikip It will pay greatly to understand the mechanism of dynamic range compression BEFORE you begin to record keeper tracks with the compressor on SETTING THE THRESHOLD The threshold is the point at which the compressor begins to attenuate the incoming signal This control can also be loosely thought of as compression amount as a high threshold setting counterclockwise will result in only the dynamically highest passages of signal to be attenuated while everything below that threshold is unaffected by the circuit Conversely a lower threshold means more of the signal at the input of the circuit will be attenuated resulting in more compression 10 Begin with the knob fully counterclockwise and the compressor switched ON then slowly begin turning clockwise until you begin to compress the signal You will hear the signal compress and you will begin to see the GR meter light up The lower the threshold setting the more the incoming signal will be attenuated and the more lights will light up on the GR meter SETTING THE ATTACK RATE The rate at which you want the compressor to start the attenuation of the signal attack phase
5. AC power cord Rearpanel Connections LINK IN sidechain MICROPHONE INPUT The XLR microphone input connection wired with pin 2 positive pin 3 negative and pin 1 ground 48V phantom power when used is supplied on pins 2 and 3 MICPRE OUT The balanced XLR direct output of the mic preamp section before the EQ COMP section The connector is wired with pin 2 positive pin 3 negative and pin 1 ground UNBALANCED MIC PRE OUT The unbalanced 1 4 direct output of the mic pre section before the EQ COMP section The connector is wired with tip positive sleeve ground LINE INPUT The balanced XLR input of the EQ COMP section after the mic preamp This connector is wired with pin 2 positive pin 3 negative and pin 1 ground MAIN OUT XLR The balanced XLR output of the entire m103 including the mic preamp if selected EO and COMP sections The connector is wired with pin 2 positive pin 3 negative and pin 1 ground MAIN OUT TRS The balanced TRS output of the entire m103 including the mic preamp if selected EO and COMP sections The connector is wired with tip positive ring negative and sleeve ground UNBALANCED MAIN OUT The unbalanced 1 4 output of the entire m103 including the mic preamp if selected EQ and COMP sections The connector is wired TIP positive SLEEVE ground 8 STEREO LINK SIDECHAIN This switch selects the mode of the LINK IN jack between stereo link mode and sidechain 9 LINKIN This 1 4 input
6. accepts either the connection from another m103 for linking compressor controls for stereo use or an external side chain signal source to control the compressor for ducking or de essing applications In sidechain mode the connection is unbalanced with only the tip connected so simply use an unbalanced 1 4 connector Link mode requires a TRS 1 4 inch cable The switch to the the right of the jack selects between the two modes while the LINK SC frontpanel switch activates the circuit in whichever mode is selected power cable is included with the m103 For safety the power supply cord must be connected to a grounded outlet The Disconnect Device for the m103 is the Mains plug or the Appliance Coupler on the power supply cord The Disconnect Device must remain accessible and operable 10 f POWER SUPPLY A universal input AC supply provides mains power to the m103 A standard three prong AC Installing and Connecting the mIO3 UNPACKING Your m103 box includes the m103 an AC power cable and a bag with this owner s manual a warranty card a set of four 1110 32 rack screws with washers and a set of 4 adhesive rubber feet If any of these items are missing let your dealer or us know and we will expedite the missing item to you We strongly encourage you to save the box supplied with your m103 It is specially designed to properly protect its valuable contents and in the unlikely event that you need to return it for service only these OEM shipp
7. before internal clipping This can happen in conditions when too much gain has been added to the signal in the EQ COMP section If this happens it s a good idea to take an inventory of where your eq points are set and how much gain you are adding A good rule of thumb is that subtractive eq should precede additive eq In other words cutting other frequencies can help highlight the frequencies you wish to enhance without building up excessive gain in your signal path Note that this LED is before the output trim control OTHER EQ RECOMMENDATIONS If you don t have much experience using an equalizer there is a wealth of information on the Internet to be had It is very helpful to at least know the basics of equalizing the most common instruments and those basics will lead to a deeper understanding of not only how an EQ works but how the instrument works and what it takes to get it to sound right for your particular recording Again there is no wrong way to do it Changing the tone of an instrument is ultimately a subjective thing but the more you experiment the more you will understand and ultimately the better your recordings will sound Operating the COMP Section The compressor circuit is based on an optical attenuator the purest high fidelity gain control mechanism available It provides gentle to fairly heavy compression while remaining neutral and transparent This compressor is not designed for brick wall limiting Similar to an eq
8. m103 mic input and then turn on the phantom power switch on if required When sending a signal to a recorder that has fixed input levels simply increase the gain until the optimum recording level is reached 4 When sending a signal to a recorder with a variable input use the following procedure Turn the gain control fully counter clockwise set the trim control at 12 O clock Set the record level control on the recorder to 12 o clock or midway between minimum and maximum With the sound source present turn the preamplifier gain control clockwise until the peak LED begins flashing red then reduce the gain until the red stops flashing NOTE since red indicates a peak level which is 10dB before clipping it is OK for it to come on occasionally during recording Adjust the recorder input control for the optimum recording level USING THE TRIM CONTROL The trim control can be used for fine output level adjustment as well as for level riding during recording or gain makeup after the compressor section The trim control can add or subtract an additional 10dB of gain for a total maximum preamplifier gain of 75dB If the trim control is not needed for riding gain providing extra gain boost or makeup gain from the compressor then it should be left at zero 12 o clock USING RIBBON MIC MODE Activating the ribbon switch does three things 48V phantom power is locked out to prevent potential damage to ribbon microphones phantom decoupling caps are by
9. when active or phantom power on or is present from another source mixer interface 5 RIBBON SWITCH This switch activates ribbon mic mode also great for dynamic mics This mode activates the relay bypass of phantom power decoupling capacitors increases microphone input impedance and locks out 48V phantom power to prevent accidental damage to delicate ribbon microphones LED indicator illuminates white when active 6 75HzHIGH PASS FILTER Sometimes referred to as a bass roll off the high pass filter rolls off at 75Hz This 12dB 10 11 12 13 14 15 16 17 18 19 20 21 22 23 octave filter employs a transitional Thompson Butterworth response for the best combination of passband flatness and time domain response LED indicator illuminates amber when active MIC LINE switch This switch selects which input feeds the EQ COMP section either the microphone preamplifier input MIC IN from the rear panel XLR or the front panel HI Z TRS input or the balanced XLR LINE IN on the rear panel The LINE IN input is after the mic preamp section and is the direct input to the EQ COMP section In either scenario the mic preamplifier is always active LOW GAIN EQ section This knob controls the amount of cut or boost applied to the selected low frequency from 12dB to 12dB LOW FREQ This knob selects the frequency of the low band EQ from 20 Hz to 750 Hz LOW frequency EQ type switch
10. 096 Operation temperature range 10 C to 40 C Storage and transportation temperature range 40 C to 70 C Maximum altitude 3000m 9843 ft Equipment suitable for continuous operation Weight preamplifier 2 05kg 4 5lbs Safety Marking Symbols CAUTION READ ACCOMPANYING DOCUMENTS This symbol located on the equipment and in this manual refers to important instructions Read this manual thoroughly before operating this equipment WARNING ELECTRICAL SHOCK HAZARD This symbol located on the equipment and in this manual indicates the potential for electrical shock hazard SERVICE INFORMATION The Grace Design m103 contains no user serviceable components Contact Grace Design for repair and upgrade information In the event that your Grace Design m103 needs to be returned to the factory contact us for a return authorization number Features Fast and musical transimpedance microphone preamplifier architecture High fidelity audio path with 0 5 precision metal film resistors 12 position gold plated rotary gain switch High performance output line driver amplifiers Ribbon mic mode also great for dynamic mics Relay bypass of phantom power decoupling capacitors increased input impedance and 48V lockout 3 band precision EQ fully parametric mid band peak and shelf mode for hi and low bands Optical Compressor 10 segment Gain Reduction and Output VU meters Mic Amp direct output EQ COMP section line input Laser etched bl
11. 10kHz gt 65dB FREQUENCY RESPONSE Mic input 40dBm Gain 3dB 3 7Hz 140kHz Hi Z input e 20dB Gain 3dB 1 2Hz 112kHz IMPEDANCE Mic input 8 1 Mic input Ribbon mode 20 Hi Z input unbalanced 2 5MO Hi Z input balanced 5MO Balanced Output 3000 Unbalanced Output 1500 PEAK LED METER Green threshold 10dBu Red threshold 16dBu MAXIMUM OUTPUT LEVEL 100k Ohm load 0 1 THD 28dBu EQ COMP SECTION GAIN RANGE Output Trim 10 10dB EQ 3 Bands of 0 12dB Cut or Boost Low Frequency Range 20Hz 750Hz Mid Frequency Range 500Hz 4kHz Mid Frequency Q 05 5 High Frequency Range 3kHz 20kHz Compressor Inserts Pre or Post EQ Threshold Range 15 415 dBu Attack Range 3 200 ms Release Range 003 35 Ratio Range 1 1 12 1 Gain Reduction 0 20dB THD N 1kHz 22Hz 22kHz BW OdB Gain 20dBu out 0 00296 INTERMODULATION DISTORTION OdB Gain 20dBu out SMPTE DIN 4 1 7kHz 50Hz 0 00296 OUTPUT NOISE 22Hz 22kHz BW 0dB Gain 78dB CMRR Q0GB Gain 3 5Vcm 100Hz gt 75dB 1kHz gt 75dB 10kHz gt 75dB FREQUENCY RESPONSE 0dB Gain 3dB 0 016Hz 150kHz IMPEDANCE Line In 24kO Main Out balanced 3500 Main Out unbalanced 1500 Link In sidechain mode 100kQ OTHER LEVEL METERS EQ Peak threshold 6 dB below interstage clipping Output Level VU Meter OdB VU 4dB
12. 7 LEG ZEN LE a 5 Md lw channel strip info gracedesign com www gracedesign com owner s manual Rev A 2434 30th Street Boulder CO 80301 USA all contents O Grace Design Lunatec LLC tel 303 443 7454 fax 303 444 4634 Welcome and thanks for purchasing the Grace Design m103 channel strip We build all of our products to be completely reliable and easy to use so you can concentrate on making great recordings not struggling with complicated equipment or difficult product manuals While you will find the m103 is completely straightforward to use we do ask that you spend a little time familiarizing yourself with this product manual to help avoid any common user difficulties In the event that you do encounter any technical difficulties with this or any of our products feel free to call us at 303 443 7454 Our office hours are 9 to 5 Monday through Friday MST or you may email any technical questions to info gracedesign com Also please check out our web support page listed below for the latest Grace Design product information owners manuals and technical documents Grace Design has been building audiophile quality products for the recording industry for over 15 years The technology in the m103 is the result of extensive listening field testing and careful refinement Your new m103 channel strip represents a combination of absolutely pristine audio performance robust mechanical construction and bombproof reliability at a
13. ack anodized frontpanel Sealed gold contact relays for all signal switching Built in universal power supply Five year transferable warranty on parts and labor Made in the USA Front Panel Controls Features 2 7 18 24 27 SRrAC TIITIIIHDONIIIIIIIID y IFO e Y 108k Y Sac OMP o 48 ribbon 75Hz 8 Bom i 2 20 750 7 12 5k Ak 2 4B 20k as WP 45 45 3 200 03 3 wu 51 23 10dB GAIN 65dB lo gain lo freq a i mid freq 5 hi gain hi freq threshold attack riagg atio 0dB TRIM 10dB liIiiililiiiilitiiiilili 3 4 56 8 9 10 11 12 13 14 15 16 17 19 20 231 22 23 25 26 28 29 1 1 4inch TRS instrument HI Z input Designed to accommodate a wide variety of high impedance input sources making the m103 an excellent choice as a DI instrument input 2 PEAKINDICATOR The LED peak indicator which monitors the signal at the output of the mic preamplifier illuminates green at 10dBu and red at 16dB 12dB before clipping Located between the HI Z input and GAIN controls 3 GAIN CONTROL The gain control has 12 positions and adjusts the voltage gain on the microphone input from 10dB to 65dB in 5dB steps When using the instrument input the gain range is 10dB to 45dB in 5dB steps 4 48V PHANTOM POWER This switch provides 48 volts to power condenser microphones The phantom power switch labeled 48V connects the 48V power supply to pins 2 and 3 on the XLR input connector LED indicator illuminates red
14. ce lies usually 6 9k This inserted signal makes the compressor react to and thereby reduce only the places in the signal where troublesome sibilance lies There are many other functional and creative ways to use sidechain input more than can be illustrated here Again the more you know the more powerful it can be GR METER This meter shows the amount of gain reduction being applied by the compressor The LED s illuminate right to left with one LED representing 1dB of gain reduction and ten LED s representing 10dB s of gain reduction or more Selecting a lower threshold setting will activate the compressor with relatively lower signal levels and will be reflected on the GR meter as more gain reduction Selecting a faster ATTACK time will show on the meter as the LED s turning on faster selecting a slower RELEASE will show on the GR meter as the LED s staying lit longer There is no correct setting for this meter it is simply displaying how the compressor is working If all the lights are on you are probably SQUASHING IT If only the first three are lighting up you are applying gentle compression The meter is a good place to start in getting the proper setting but it doesn t necessarily mean that it sounds right As always let your ears be your guide LINK CONTROL This feature is used to link two m103 compressors together for stereo bus compression In this application only the compressors are linked and not the eq s To use this fea
15. e MIC PRE OUT to a separate track to record a safety of the performance with no EQ or compression Use the MIC PRE OUT and the LINE IN as insert points for another piece of outboard gear in which case the frontpanel LINE MIC switch would need to be switched to LINE Use the mic preamplifier and EQ COMP section independently on different sources Using the EQ COMP section with a line level signal from a recorder or workstation that is recorded at a low level you may not be able to get a proper threshold setting on the compressor circuit If this the case feel free to use the mic preamp section to introduce some extra gain to your signal by inserting your line level signal into the MIC IN input select mic on the frontpanel mic line switch This circuit is totally transparent and is perfectly suited to this application All outputs are active all the time so you have the possibility of up to 5 live outputs if your source is MIC IN or 3 live outputs if your source is LINE IN Operating Microphone Preamplifier SETTING THE MIC PREAMPLIFIER GAIN 1 If you are using the m103 with a microphone signal it is recommended that you start with the EQ and COMP sections turned off This will simplify the process of setting proper operating level of the mic preamplifier 2 Turn the GAIN control fully counter clockwise set the TRIM control at 12 o clock no boost or cut and check that the 48V phantom power is off 3 Connect the microphone to the
16. el The highest setting of this control is 12 1 meaning that signals far over the threshold setting are reduced by a much higher ratio more compression So lower ratio settings mean lighter compression amounts We recommend starting with lower ratios and working upward as necessary SIDECHAIN CONTROL Normally the compressor s sidechain circuit uses the internal audio signal to trigger its response But in sidechain mode the sidechain circuit uses an external signal input from the LINK IN jack on the rearpanel to determine how the compressor responds Examples of using an external sidechain signal include ducking and de essing Ducking is an effect used to automatically reduce the level of one signal when another signal is present Think of a DJ s microphone automatically reducing the level of the music when he or she is speaking It involves routing a separate signal from a microphone or any other source into the sidechain input of the m103 This signal is what the compressor reacts to and thereby would typically reduce or duck the level of the main signal in the m103 You would use the compressor controls to determine the amount rate and duration that incoming signal ducks the main signal De essing is used to decrease excessive sibilant s or sh sounds in a voice This is accomplished by inserting a copy of the signal into the sidechain input which has been equalized by an external equalizer to emphasize the frequency where the sibilan
17. ing materials will ensure their safe return to our factory Also we strongly urge you to register your unit with Grace Design We provide a 5 year warranty on all of our products but if you don t register your system it s hard for us to help you if and when help becomes necessary So please take a few minutes to complete the enclosed warranty registration card and mail it in or simply go to the warranty registration form on our web site Thank you INSTALLING The m103 can be installed in a standard 19 equipment rack or sit on any flat surface When installing it in a rack make sure to use the supplied screws and washers to prevent any unwanted scratching or marring of the rack ears The m103 does not run hot and requires no ventilation so it can be installed with equipment directly above and below it If leaving to sit on your desktop or monitor shelf install the 4 rubber feet to the bottom of the chassis to prevent scratching your chassis and or surface CONNECTING The m103 offers a great degree of flexibility in how it can be integrated into your recording setup The most basic setup is a microphone connected to the XLR MIC IN and the XLR MAIN OUT connected to your mixer or recording device Or a line level signal source patched directly into the LINE IN to access the EQ COMP section without the signal going through the mic preamplifier Beyond that there is a plethora of possible connecting and routing scenarios For example Send th
18. lowly the compressor circuit releases the attenuation of the incoming signal RATIO The ratio control determines the input output ratio for signals above the threshold level Higher ratios result 24 25 26 27 28 29 in a more aggressive gain reduction while lower ratios will result in more gentle gain reduction COMP IN SWITCH This switch activates the COMPRESSOR circuit The LED above the switch illuminates when the COMP is active turns off when deactivated This switch controls a gold contact relay LINK SC This switch is to activate either a linking of two m103 s compressor s side chain circuits for use in stereo compression scenarios or b to activate external side chain control of the compressor for ducking de essing etc GR METER This 10 segment meter displays the amount of gain reduction being applied to a signal in the compression circuit VU METER This 10 segment meter displays the VU volume units at the m103 s output OVU 4dBu TRIM CONTROL The trim control provides 20dB of variable level control at the output of the m103 from 10dB to 10dB This control is useful for small level adjustments during tracking or for compression gain makeup POWER STANDBY SWITCH The power switch activates the power supply circuitry When in the up position the green POWER LED will illuminate When in the down position the m103 is in standby mode To completely disconnect power from the m103 remove the
19. nty registration card enclosed with all of our products within 10 days of the original date of purchase You may also register your product directly with Grace Design by telephone 303 443 7454 Monday Friday 9 00am to 5 00pm MST or you can register your product online at www gracedesign com This warranty is in lieu of all other warranties whether written expressed or implied INCLUDING ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE In no event will Grace Design be liable for lost profits or any other incidental consequential or Exemplary damages even if Grace Design is aware of the possibility of such damages In no event will Grace Design s liability exceed the purchase price of the product This warranty gives the customer specific legal rights The customer may also have other rights which vary from state to state Some states do not allow limitations on implied warranties or consequential damages so some of the limitations of the above may not apply to a particular customer Manual Revisions
20. or is doing and also how it is interacting with level status down stream 1 The first is the mic preamplifier PEAK LED positioned between the HI Z input and the GAIN control This monitors the signal at the output of the preamplifier It illuminates green at 10dBu and red at 16dBu 12dB before clipping This is the best way to see how your microphone preamplifier is working at a glance if the red is flashing periodically you re probably not yet clipping the mic preamp If it is predominately flashing RED then you may be close to clipping and should reduce you mic preamp gain 2 Nextisthe the PEAK LED which is used to monitor any peaks within 6dB of internal clipping in the line section EQ COMP If this illuminates take an inventory of where your eq points are set and how much gain you are adding If there is too much boost in the EQ this may cause the line section to peak Also this may be affected by the gain setting of the microphone preamplifier upstream If peaks are occurring without any gain boost in the EQ then you may need to lower your mic preamplifier gain 3 Lastly is the VU OUTPUT level meter which is used to monitor the level at the output of the m103 This meter is designed to work like an analog VU meter Analog VU meters have a reaction time which is effected by physical inertia which makes them slower than much of the transient peak information in a music signal This means that an analog VU meter is not good at monit
21. oring peaks but at displaying the average volume VU volume units of the signal So we have tailored the response of our LED VU meter to act this way While the actual headroom of the m103 is 28dBu the VU meter only displays signal activity between 20 and and 3dBu So in other words 3 on the VU meter DOES NOT denote a peak the VU meter on the m103 is there to show average volume of your signal Actual peaks should be monitored downstream at your converter interface or workstation Setting the TRIM control The TRIM control provides 20dB of variable level control at the output of the m103 After setting correct microphone preamplifier levels and ensuring that the line section EQ COMP is not experiencing any peaks you can set the over all output of the m103 with the TRIM control Use the TRIM to properly match to the input of your converter interface or recorder Also your signal level may have been be reduced by heavy compression settings so the TRIM control can also be used to provide makup gain 11 Block Diagram RIBBON 75Hz HPF HI Z IN 48V PHANTOM POWER HI Z AUTO SELECT 14dBu 16dBu 6 6 AMPLIFIER MIC IN MICROHONE MIC PRE OUT UNBALANCED x gt LINE MIC SWITCH LINE IN LINE AMPLIFIER 060000088000 U THRESHOLD ATTACK RELEASE RATIO 6 5 gt 4 O Y Y Y MAIN OUT BALANCED Que Gm Gm a c CD 9900000000 RE OUTPUT MAIN OUT BALANCED
22. passed and the impedance of the mic input is raised from 8 1kO to 20kQ The m103 has ample available gain sufficient for even the most demanding low level recording scenarios with ribbon microphones USING THE HPF The high pass filter sometimes referred to as a bass roll off starts at 75 Hz This 12dB octave filter employs a transitional Thompson Butterworth response for the best combination of passband flatness and time domain response Most common uses for this are in situations where low end rumble from mechanical sources or wind are present to reduce excessive proximity effect or to simply help reign in excessive bass during recording Operating the Q Section The m103 equalizer section has 3 bands with a fully parametric mid section and sweepable low and high sections This equalizer has been crafted to be very powerful and versatile with no compromise to the transparency and detail of the signal Because of its high level of precision and accuracy you may find yourself being able to hear a much smaller amount of cut or boost than you would with other EO designs Both the low and high sections can be operated in either peak 4 or shelf mode Peak mode as indicated by the bell shaped icon is used to cut or boost a specific frequency Shelf mode as indicated by the shelf icon boosts or cuts all of the frequencies above for the HI band or below for the LOW band the frequency selected While there is no wrong way to set an e
23. qualizer there are some general guidelines that may help you get the results you are looking for a little faster CONTROLLING BASS FREQUENCIES In addition to the low frequency controls of the m103 we have included the 75Hz HPF on the mic preamp section If you need to reduce rumble wind noise or excessive proximity effect its recommended that you start with this control rather that putting the EQ to work at this job Again the m103 EQ is very precise and powerful which is well illustrated by beginning to shape the tone of an instrument s bottom range If you need to add some girth to a bass guitar you should be able to readily hear 3dB of boost in the 50 to 100Hz range Pay close attention not to add low frequencies at the amount that they may overtake the balance of the instrument or the mix unless that s what you intend to do there is no wrong way CONTROLLING MID FREQUENCIES The MID band of the m103 is fully parametric which means that not only can you set the exact frequency you wish to adjust but you can control the Q factor as well O is a measure of the sharpness of the boost or cut at the selected frequency A lower Q setting knob turned to the left means the boost or cut will have a greater effect on the adjacent bands Higher Q setting means less effect on adjacent bands providing a more surgical cut or boost of the selected frequency PEAK INDICATOR This red LED illuminates when the level in the EQ reaches 6dB
24. reasonable price Regardless of what audio sources you plan to record your m103 will faithfully serve as a versatile link between your microphone or instrument and recording device We sincerely hope our products help you achieve a new level of excellence in your work SRACE 987654 DRA 1017 51 0 MIOZ o mi 2 E e 108k ses MPO r P SESS 2 UC e e P LP M A a 9 o in Sem in link 4BVrbbon7SHz Je 20 9B 750 gt ee a 5 zok E s s E 10dB GAIN 6548 lo gain mid gain mid freq midQ hi gain threshold attack release 10dB TRIM IOdB Table of Contents Important Safety Information 3 Safety Marking Symbols 3 Features 4 Front Panel Controls Features 4 Rearpanel Connections 6 Installing and Connecting the m103 7 Operating the EQ Section 8 Operating the COMP Section 9 Metering 11 Setting the TRIM control 11 Block Diagram 12 Wiring Diagram 13 Specifications 14 Warranty Information 16 Manual Revisions 17 Important Safety Information GENERAL Indoor use only Ordinary Protection This equipment should not be exposed to dripping or splashing Avoid placing objects filled with liquids such as vases or glasses on this equipment Class Equipment grounded type Electrical rating 100 240V 50 60Hz 14W Mains supply voltage fluctuations are not to exceed 10 of the nominal supply voltage Pollution Degree 2 Installation Overvoltage Category Il for transient overvoltages Maximum Relative Humidity 8
25. ture simply run a standard 1 4 TRS cable between two m103s connected to the link sidechaln jack Both units LINK switches must be on and both rearpanel sidechain link switches must be set to LINK In this mode the sidechain signals of both units are summed together into one Neither unit is the master rather changes made to either compressor will effect the summed sidechain signals So its best to keep the two units set basically the same However the RATIO control setting isn t summed and remains independent So this setting must be set visually with stereo program meters and or by ear CHOSING EQ gt COMP or COMP gt EQ Again another subjective option but with some rules of thumb that apply There may be an instance where it is preferable to compress before you EQ or visa versa Perhaps it makes sense to have the compressor only working to compress an already signal This may be the case if your source has been radically EQ d with dramatic cuts so that there is no point in having the compressor section work to compress a lot of signal that will be cut Or conversely if you have a lot of boost introduced into the signal perhaps it works better to have the dynamics processed prior to EQ We recommend that you experiment as much as can And with this feature especially let you ears be your guide Metering The m103 has 3 places to monitor level status throughout its signal path It is important to understand what each indicat
26. u output Gain Reduction Meter 0 10dB Gain Reduction MAXIMUM OUTPUT LEVEL 100k Ohm load 0 1 THD 28dBu WEIGHT and DIMENSIONS 4 5 lbs H1 7 xW19 x D9 0 2 05 kg H4 3cm x W48 3cm x D22 9cm POWER CONSUMPTION 100 240VAC 50 60Hz 14 Watts Max 15 16 Warranty Information Grace Design warrants all of our products to be free of defective parts and workmanship for a period of five years This warranty period begins at the original date of purchase and is transferable to any person who may subsequently purchase the product during this time This warranty excludes the following conditions normal wear and tear misuse customer negligence accidental damage unauthorized repair or modification cosmetic damage and damage incurred during shipment During the time of this warranty Grace Design will repair or replace at its option any defective parts or repair defec tive workmanship without charge provided the customer has appropriate proof of purchase and that the product has its original factory serial number Customers within the US are responsible for all inbound freight charges to Grace Design s facility while Grace Design will pay for return freight charges via ground service Customers outside the US must contact their distributor for warranty product return details In order for Grace Design to provide efficient and timely warranty service it is important that you mail the completed warra
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