Owner`s manual Rev B
Contents
1. a 7 f N SHIELD 3 open figure 1 Unbalanced output cable termination N POWER CONNECTIONS An 8 2 8m DC power cord is supplied to connect the power supply unit to the pream plifier unit This cord can be identified by the 7 pin XLR connectors at each end Please note that the DC power cord should be connected before the AC power is turned on This prevents incorrect power sequencing which can cause damage to the audio circuits To avoid any interference with the low level audio circuitry the power supply should be located at least 3 1m from the preamplifier unit WARNING A damaged DC power cord can create a shock hazard as voltages of 72VDC can be present Do not operate the m801 with a damaged DC power cord Replace a damaeged DC power cord with a replacement from Grace Design A standard AC power cable is included For safety the power supply cord must be connected to a grounded outlet AC input voltage settings can be adjusted for 100V 120V 220V and 240V operation at 50 60Hz If your line Voltage is 230VAC then use the 240V setting From the rear of the power supply unit open the trap door next to the IEC power inlet with a small screwdriver Carefully pull the voltage select cam straight out and then insert with the desired voltage showing Do not try to rotate the cam while it is in the power input grace design m801 owner s manual module Replace the fuses with the proper value selected from table2. 99 RUE S Pious a ea an Em og es D1 468 ig o alao a S att c23 ra Bci 1 e pe 2 8 R35 R38 zi C45 R37 843 grace design m801 owner s manual SPECIFICATIONS PREAMPLIFIER SPECIFICATIONS FREQUENCY RESPONSE 40dB gain 3dB 50Q source 4 5Hz 350KHz 40dB gain 0 2dB 50Q source 18Hz 65KHz THD N 20dB gain 20dBu out 1kHz lt 0008 40dB gain 20dBu out 1kHz lt 0009 60dB gain 20dBu out 1kHz lt 0070 INTERMODULATION DISTORTION 40dB gain 20dBu out SMPTE DIN 1 1 50Hz 7kKHz lt 0020 SMPTE DIN 4 1 50Hz 7kKHz lt 0030 NOISE REFERRED TO INPUT 60dB gain 50Q source 130dB 60dB gain 1500 source 127dB 60dB gain 600Q source 123dB PHASE DEVIATION 100 20KHz 40dB gain lt 3 CROSSTALK Any Channel 40dB gain 1kHz 140dB Any Channel 40dB gain 10kHz 130dB CMRR 60dB gain 3 5Vcm 1KHz gt 70dB 60dB gain 3 5Vcm 10KHz gt 70dB PHANTOM POWER Voltage 48V 0 9 0 0 6 8kQresistor match tolerance 0 1 MAXIMUM OUTPUT LEVEL 1kHz 100KQ load 28dBu IMPEDANCE Input 43500 Output 1900 DIMENSIONS Weight 15lbs 6 8kg Height 2U Width 19 Depth 10 POWER SUPPLY SPECIFICATIONS POWER CONSUMPTION 100 240VAC 50 60Hz 60 Watts max DIMENSIONS Weight 6 25lbs 2 8kg Height 1 7 Width 8 5 Depth 8 5 grace design m801 11 owner s manual 12 CLEANING
3. OO O 0 24 24 5 48 BEFORE TURNING ON MAIN POWER co USA CAUTION ALWAYS CONNECT DC POWER CORD XLR OUTPUT CONNECTOR Output connections are made via male XLR con nectors with pin 2 positive pin 3 negative and pin 1 ground PARALLEL XLR OUTPUT CONNECTOR An additional set of parallel XLR outputs are pro vided for sending line signals to additional record ing devices or mixers LED VOLTAGE INDICATORS POWER SWITCH AC LINE INPUT Dc oUTPUT 6 GROUND IS0 SWITCH grace design m801 5 owner s manual 6 INSTALLATION AUDIO CONNECTIONS Input connections are made via female XLR connectors with pin 2 positive pin 3 nega tive and pin 1 ground 48V phantom power is supplied on pins 2 and 3 Output connections are made via male XLR connectors with pin 2 positive pin 3 nega tive and pin 1 ground If the output is to be used unbalanced pin 1 should be con nected to signal ground and pin 2 to signal hot Due to the nature of the balanced output stage pin 3 should be left open for unbalanced operation See figure 1 below Note This will provide a signal of positive absolute polarity when the preamplifler is being used with a microphone which produces a positive voltage on pin 2 with positive air pres sure on the front of the diaphragm While a vast majority of microphones conform to this standard a few do not Use the phase reverse switch to compensate if necessary
4. 1 below Be sure to use a time delay fuse with a 250V rating CAM SETTING LINE VOLTAGE FUSE VALUE 100V 100V 250V T 750mA L 120V 120V 250V T 750mA L 220V 220V 250V T 500mA L 240V 230V 250V T 500mA L 240V 240V 250V T 500mA L table 1 fuse value table CHECK LINE VOLTAGE SETTINGS The power supply unit has been set from the factory to operate at the voltage required for your part of the world However it s important to double check this in order to ensure no damage will come to the unit if power is applied while the setting is incor rect TURNING THE POWER ON The power switch is located on the front panel of the Power Supply Unit Switching the rocker switch to the position turns the mains power on Switching the rocker switch to the O position turns the mains power off GROUNDING OPTIONS In certain installations it may be desirable to separate the preamplifier signal ground from the chassis and earth grounds Noise inducing ground loops can be broken while retaining the safety feature of the grounded AC power cord The m801 should not be operated with a ground lift or cheater plug on the AC power cord To separate the preamplifier signal ground from the chassis and earth grounds simply set the AUDIO GND toggle switch on the rear panel of the power supply unit to the desired setting ISO or EARTH MOUNTING The m801 power supply can be rack mounted in a standard 1U rack tray and two power supply unit
5. AND MAINTENANCE Your m801 amplifier chassis is constructed out of high quality stainless steel Under normal circumstances virtually no maintenance is required to keep the unit looking shiny and new However if your unit becomes smudged or dirty here are some clean ing tips We recommend using either Pledge furniture polish or Zep brand stainless steel cleaner available at the hardware store Apply cleaner to a clean dry lint free cloth and gently wipe all stainless surfaces taking care not to allow the cleaning prod uct to build up around the panel switches or knobs WARRANTY INFORMATION OGrace Design warrants all of our products to be free of defective parts and workmanship fora 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 OThis 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 defective workmanship without charge provided the customer has appropriate proof of purchase and that the product has its original factory serial number Qin order for Grace Design to provide efficient and timely warranty service it is important that you ma
6. RACE D S C KK K O0 000 0 0000 e000 eooc 209C c 000 2048 ribban Bribbon 48V 48v 204 prenne 000 48V 20dB ribbon m8801 ESIGN USA GRACE D rmcO 1 microphone preamplifier OWNER S MANUAL all contents 2006 Grace Design Lunatec LLC Manual RevB WELCOME Thank you for purchasing the Grace Design m801 microphone preamplifier With the combination of unmatched sonic performance and total reliability the m801 is the ul timate state of the art microphone preamplifier solution We have designed the m801 to be as easy and intuitive to use as possible However we strongly recommend that you read this product manual thoroughly to familiarize yourself with the unique features and capabilities of the m801 Also please do not hesitate to contact us directly if you have any questions comments or concerns with your new m801 microphone preamplifier Thanks for reading and happy recording The Grace Design Team Contents WELCOME 2 IMPORTANT SAFETY INFORMATION 3 FRONT PANEL CONTROLS 4 REARPANEL CONNECTIONS 5 POWER SUPPLY 5 INSTALLATION 6 PREAMPLIFIER OPERATION 7 MAINTENANCE 8 SPECIFICATIONS 11 CLEANING AND MAINTENANCE 12 WARRANTY INFORMATION 12 2 grace design m801 owner s manual IMPORTANT SAFETY INFORMATION GENERAL Indoor use only Ordinary Protection This equipment should not be exposed to
7. dripping or splash ing Avoid placing objects filled with liquids such as vases or glasses on this equipment Class Equipment grounded type Electrical rating 100 120 220 240V 50 60Hz 60W 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 lt 80 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 6 8kg 15lbs power supply unit 2 8kg 6 25lbs SAFETY MARKING SYMBOLS CAUTION READ ACCOMPANYING DOCUMENTS This symbol located on the equipment and in this manual refers to impor tant instructions Read this manual thoroughly before operating this equip ment WARNING ELECTRICAL SHOCK HAZARD This symbol located on the equipment and in this manual indicates the potential for electrical shock hazard DC POWER OUTPUT O gt This symbol located on the equipment and in this manual indicates a DC power output connection SERVICE INFORMATION The Grace Design m801 contains no user serviceable components Contact Grace De sign for repair and upgrade information In the event that your Grace Design m801 needs to be returned to the factory contact us for a return authorization number grace d
8. eous change in amplitude when turned which creates a transient signal EQUIPMENT NEEDED DC Volt meter with at least 1mV sensitivity Plastic alignment tool or a small screwdriver 2 phillips head screwdriver PROCEDURE 1 Remove the 8 phillips head screws from the top lid but leave the lid in place 2 Set all of the preamplifier gain controls to maximum 3 Turn on the m801 preamplifier and allow to warm up for at least 45 min utes go get a nice cup of coffee and do some stretches 4 Remove the top lid and locate the DC offset test points TP1 and TP2 fig ure 3 Place the Volt meter probes into these holes 5 Locate DC offset potentiometer VR2 and rotate it for a reading of 0 000VDC 0 003V 6 The input offset does drift with temperature and having the lid off will al low the circuitry to cool It is advisable to replace the lid and let the preampli fier warm up again about 20 minutes and then re check your adjustments TP1 AND TP2 VR2 OFFSET ADJUST OFFSET TEST POINTS VR1 PEAK LED ADJUST 48 18 18 15 15 5 OOOOOO OFFSET 10 AT A 32 REV c38 CJ g TP1 TP2 R47 F C42 RDF LINJ TSF E SER U3 E C37 a P M i k AL EE BB lt CRO G 3 S cs BE TE REF luz alo RAT c cr SG E A 2 J ra R30 R34 1 Era RAT Uae R31 I D Pal a A R22 C25 R29 T D9 Wi I CT lt RED WIRE 4 N C27 E26 C30 RA C R24 R32 u a g ISSE ISS 7 Z S Ha Ce F pRa g S
9. esign m801 3 owner s manual 4 FRONT PANEL CONTROLS 48V 20dB ribbon 48V Q 24 POSITION GOLD CONTACT GAIN SWITCH Each gain control has 24 positions and adjusts the voltage gain from 18dB to 64dB in 2dB steps For reference the 9 o clock position is 28dB the 12 o clock position is 40dB and the 3 o clock position is 52dB BI COLOR LED PEAK INDICATOR The LED peak indicator which monitors the output signal turns green at 14dB and switches to red at 16dB 12dB before clipping The threshold level for peak indication is adjustable on each channel see page 8 48V PHANTOM POWER SWITCH The phantom power switch labeled 48V con nects the 48V power supply to pins 2 and 3 on the XLR input connector This switch illuminates red It should be noted that the LED in this switch actually monitors the voltage at the input With no microphone connected the LED will continue to illuminate for approximately 10 seconds after the phantom power is turned off as the filter capaci tors discharge As well even if the phantom power is switched off the LED will illuminate if voltage is being fed from an external source i e when using a direct split in a remote recording application grace design m801 owner s manual 20 so OOO OOOO 20dB ribbon 48V 2qdB ribbon 48V 20dB ribbon GRACE DESIGN USA O PHASE REVERSAL SWITCH The phase reverse switch reverses the absolute polarity of t
10. he music signal at the input of the preamplifier The switch illuminates green and provides power for a sealed gold contact relay lo cated on the preamplifier circuit board This elimi nates signal wiring to the front panel and switch contact performance problems 20 PAD SWITCH The 20dB attenuator switch attenuates the input signal 20dB The switch illuminates amber when engaged Like the phase reverse switch this switch controls a sealed gold contact relay on the pream plifier circuit board With the 20 switch engaged the effective gain range becomes 2dB to 44dB RIBBON MIC MODE SWITCH This switch activates a 10dB increase in overall preamplifier gain while simultaneously disabling the 48V phantom power circuit to protect ribbon microphones As well the input coupling capaci tors are bypassed REARPANEL CONNECTIONS GRACE DESIGN USA m801 amp microphone preamplifier ACE _ E L MIC IN a OUT A 8 L e e OUT B 8 Q XLR MIC INPUT CONNECTOR Input connections are made via female XLR con nectors with pin 2 positive pin 3 negative and pin 1 ground 48V phantom power is supplied on pins 2 and 3 7 PIN XLR DC INPUT An 8 2 8m DC power cord is supplied to connect the power supply unit to the preamplifier unit This cord can be identified by the 7 pin XLR con nectors at each end m8OI POWER SUPPLY FRONT K gt lt G GRACE DESIGN BOULDER
11. il the completed warranty 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 OThis 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 grace design m801 owner s manual MANUAL REVISIONS Revision Page change De mas A en T 5237 fe iB all 13 updated layout added revision table 1 29 09 ledg si grace design m801 13 owner s manual
12. izes the m801 channel for ribbon microphones by boosting the gain by 10dB while disabling 48V phantom power Before activating rib bon mic mode make sure the channel s gain is fully down counter clockwise and 48V phantom power is off Now simply press the ribbon switch and turn the gain control upwards until the proper recording level is achieved If you press the 48V phantom switch while the ribbon switch is engaged nothing will happen However if the 48V phamtom switch remains depressed and the ribbon mic switch becomes inadvertantly disengaged 48V phantom will consequently be acti vated which can potentially harm a ribbon your microphone if it is still connected to the input If the 48V phantom power switch is turned of and then the ribbon switch is turned on the preamplifier will wait until the phantom power voltage has completely discharged and then the ribbon mode will activate automatically An additional ben efit of the ribbon mic mode is that the input DC blocking capacitors are relay bypassed to further simplify the m801 s signal path Incidentally the ribbon mode works very well with many lower output dynamic microphones as well as ribbon types MAINTENANCE The model m801 was designed to be maintenance free for many years It is highly unlikely that your unit will require service However there are two adjustments that may need to be made from time to time These procedures should be made only by a qualified service technician o
13. r the Grace Design factory PEAK LED ADJUSTMENT PROCEDURE The peak LED threshold levels may be adjusted to a user defined operating level This grace design m801 owner s manual circuit is set at the factory with the green threshold at 14dBu and the red threshold at 16dBu The relationship between the two thresholds is fixed The procedure for adjusting the greed red threshold follows EQUIPMENT NEEDED sSine wave audio signal generator or oscillator output from a mixing console Audio level meter or VTVM with dBu or dBm scale ePlastic alignment tool or small screwdriver Appropriate interconnect cables 2 phillips head screwdriver PROCEDURE 1 With the power off remove the eight phillips head screws from the top cover and remove it from the m801 2 Set all of the gain controls to the 30dB position 3 Connect the audio generator to the input of channel 1 4 Set the generator output level to approximately 20dBu 1KHz 5 If the generator has an unbalanced output refer to figure 2 below for termination information 6 Connect the level meter to the output of channel 1 7 Set the input attenuator to 20dBu range If the level meter has an unbalanced in put refer to figure 1 p 6 for unbalanced output termination information SHIELD XLR MALE figure 2 Unbalanced input cable 8 Apply power to the generator preamplifier then the level meter 9 Adjust the generator output level so that the preamplifier ou
14. s will fit side by side The power supply unit chassis has a 10 32 threaded insert on the bottom for mounting Use a 10 32 x 1 2 or a 10 32 x 3 8 machine screw no longer than 1 2 PREAMPLIFIER OPERATION SETTING THE GAIN First turn the gain control fully counter clockwise and check that the 48V phantom grace design m801 7 owner s manual 8 power is off Connect a microphone and then turn on the phantom power if required When sending a signal to a recorder converter or interface that has fixed input levels simply increase the gain until the optimum recording level is reached If the peak in dicator flashes red excessively with the gain control in the fully counterclockwise posi tion engage the 20dB attenuator When sending a signal to a tape recorder with an input attenuator i e the record level control on a DAT or CDR recorder use the following procedure With the sound source present turn the gain control clockwise until the peak LED begins flashing red then reduce the gain until the red stops flashing Since red indicates a peak level which is 12dB before preamplifier clipping 6dB in unbalanced mode it is OK for it to come on periodically during recording If peak indicator flashes red excessively with the gain control in the fully counterclockwise position engage the 20dB attenuator Now ad just the recorder input control for the optimum recording level RIBBON MIC MODE Pressing the ribbon switch optim
15. tput level is at the desired red threshold If the proper level can t be reached adjust the preamplifier gain control 10 Locate VR1 see figure 3 p 10 on the channel 1 audio circuit board and ad just until the peak LED is between green and red The color should appear am ber when the setting is correct Repeat this procedure for channels 2 through 8 11 If it is desired to calibrate the peak indicator to a specific converter recorder in put level simply connect the output of the preamplifer to the converter recorder Adjust the signal generator so that the desired peak level is indicated on the re corder and then adjust VR1 until the peak LED is between green and red INPUT OFFSET ADJUSTMENT The input amplifiers in the m801 are ultra precision laser trimmed devices which have a very low input offset However even the smallest differential offset at the input can result in an audible click when the gain control is turned It should be noted that this type of click will be audible when no signal is present With no signal present there is grace design m801 owner s manual 9 no signal amplitude to be changed unless input offset is present This procedure nulls the input offset and minimizes the clicking sound with no signal present In contrast there will almost always be an audible click if turning the gain control while a signal is present This is because the gain control being a stepped control will make an instan tan
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