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要旨
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Welcome Thank you for purchasing the Grace Design m201 microphone preamplifier. With the combination of unmatched sonic performance, powerful features, and solid reliability, the m201 is a powerful recording tool designed to help you make the best recordings of your career. We have designed the m201 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
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Important Safety Information GENERAL •Indoor use only •Ordinary Protection: This equipment should not be exposed to dripping or splasing. •Avoid placing objects filled with liquids, such as vases or glasses, on this equipment. •Class I Equipment (grounded type) •Electrical rating: 100-120/220/230-240V~ 50-60Hz 30W •Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage. •Pollution Degree 2 •Installation (Overvoltage) Category II for transient overvoltages. •Max
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Front Panel Controls A C B 1 2 40 40 50m m201microphone preamplifier 50s 48V 48V 30 50 ribbon 30 50 ribbon (+10dB) (+10dB) HI-Z HI-Z 130V 130V 70m 30m 20 60 20 60 INPUT MODE INPUT MODE 30s 70s 100m M+S WIDTH +48V - 20dB HI-Z +48V - 20dB HI-Z GRACE DESIGN USA H D E F G I of the music signal at the input of the preamplifier. A 24 position gold contact gain The switch illuminates green and provides power for switch a sealed gold contact relay located on the preamplifier Each gain control
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120Vac PUSH PUSH PUSH PUSH PUSH PUSH Rear Panel Connections E WORD/LOOP CLOCK MIC IN 2 1 130V m201 microphone preamplifier IN 4 1 4 1 S/PDIF 3 2 3 2 TOSLINK OUT AES3 OUT LINE IN LEAD FREE M+S OUT 2 1 Pb RoHS COMPLIENT GRACE DESIGN USA RIGHT LEFT OUT OUT MIC IN OUT OUT MIC IN D C B A A XLR mic input connectors Input connections are made via female XLR connectors with pin 2 positive, pin 3 negative and pin 1 ground. 48V phantom power is supplied on pins 2 and 3. B XLR output connectors Par
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Audio Connections Microphone input connections are made via female XLR connectors with pin 2 posi- tive, pin 3 negative 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 negative and pin 1 ground. If the output is to be used unbalanced, pin 1 should be connected 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 opera
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showing. Do not try to rotate the cam while it is in the power input module. Replace the fuses with the proper value selected from below. Be sure to use a time delay fuse with a 250V rating. CAM SETTING LINE VOLTAGE FUSE VALUE 100V~ 100V~ 250V~ T 500mA L 120V~ 120V~ 250V~ T 500mA L 220V~ 220V~ 250V~ T 315mA L 240V~ 230V~ 250V~ T 315mA L 240V~ 240V~ 250V~T 315mA L CHECK LINE VOLTAGE SETTINGS Your m201 has been set from the factory to operate at the v
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ribbon This setting puts the m201 into ‘ribbon mic mode’, which is described in detail below. Use this input for ribbon microphones or any application where an additional 10dB of gain may be required. In this position, the main XLR mic inputs are feeding the preamplifier and the dual XLR outputs are active. 130V This setting activates the optional 130V input module for DPA microphones. If the 130V input option is present, this selection will deactivate the standard XLR inputs and enable
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has completely discharged and then the ribbon mode will activate automatically. An additional benefit of the ribbon mic mode is that the input DC blocking capacitors are relay bypassed to further simplify the m201’s signal path. Incidentally, the ribbon mode works very well with many lower output dynamic microphones as well as ribbon types. M-S recording with the m201 In M-S mode the m201 accepts the Mid signal in channel 1 and the Side signal in chan- nel 2. The LEFT channel output connec
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A FS SELECT this switch is used to toggle through the available ADC sampling rates B CLOCK SOURCE this switch is used to select the ADC clock source C ADC MODE this switch is used to select single or dual wire AES, and switch between either professional or consumer fomat D OVER lights illuminate when the ADC has been overload- ed, and remain lit until the PEAK RESET swich is pushed E PEAK RESET / MODE This switch is used to clear peaks on the 20 seg- ment led meter and to select how t
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all the available sampling rates. Simply push the button to select the sampling rate you require. The selected rate will be illuminated green below. Selecting “OFF” puts the A/D converter circuitry in low power standby mode with all oscillators off. CLOCK SOURCE The m201 A/D can be run from the internal crystal, an external word clock source, or from DigidesignTM loopsync*. The top middle switch, labeled CLOCK SOURCE, is used to select between these options. The selected clock source will
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The front panel interface features a calibration mode that allows precise adjustment of the A/D sensitivity. To recalibrate one or both of the input sensitivity configurations, simply do the following: 1) Disconnect AC power from the m201. 2) Remove the 8 top cover screws using a #2 Phillips screwdriver. Lift the top cover off the unit and set it aside. 3) Reconnect AC power to the m201 and turn it on. 4) Connect a signal generator to the A/D LINE inputs. Set the signal generator output t
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R44 R43 R42 R37 AT136REV C45 C47 R28 C30 D8 C26 C24 10) Once all desired calibration adjustments have been made, press and hold the INPUT SENS button for approximately 3 seconds. This will exit CAL mode and re- turn the A/D to normal operation. The new settings are now stored until future changes are made. 11) Power down the unit, disconnect the AC power and reinstall the top cover. C27 U3 P6 C4 C6 R39 R11 P2 R12 K6 R32 R23 R26 C14 C36 C17 C32 Q3 D6 K5 D5 C15 C25 K4 C
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Maintenance The model m201 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 or at the Grace Design factory. PEAK LED ADJUSTMENT PROCEDURE The peak LED threshold levels may be adjusted to a user defined operating level. This circuit is set at the factory with the green threshold at
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INPUT OFFSET ADJUSTMENT The input amplifiers in the m201 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 no signal amplitude to be changed unless input offset is present. This procedure nulls the input offset and min
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Specifications preamplifier specifications (without A/D converter) Frequency Response @ 40dB gain ± 0.2dB (50Ω source) 18Hz-65kHz @ 40dB gain ± 3dB (50Ω source) 4.5Hz-350kHz THD+N @ 20dB gain +25dBu out, 1kHz <.0008% @ 40dB gain +25dBu out, 1kHz <.0009% @ 60dB gain +25dBu out, 1kHz <.0070% Intermodulation Distortion @ 40dB gain +25dBu out SMPTE/DIN 1:1 (50Hz, 7kHz) <.0020% SMPTE/DIN 4:1 (50Hz, 7kHz) <.0030% Noise - Referred to Input @ 60dB gain 50Ω source -130dB @ 60dB gain 150Ω source -127dB
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INPUTS ANALOG OUTPUTS GRACE DESIGN RIBBON +10dB +48V -20dB m201 SIGNAL FLOW DIAGRAM +48 OFF CH1 MIC CH 1 OUT A CH 1 OUT B BALANCED HI-Z INPUT AMP CH1 HI-Z MICROPHONE AMPLIFIER OUTPUT DRIVERS M-S OUTPUTS +130V -20dB MID CH1 DPA 6-CHANNEL LEFT OUT M-S SUMMING DPA INPUTS (OPTIONAL) SIDE AMPLIFIER INPUTS M-S WIDTH RIBBON +10dB +48V -20dB +48 OFF RIGHT OUT M-S DIFFERENCE CH2 MIC AMPLIFIER ANALOG OUTPUTS CH 2 OUT B BALANCED CH2 HI-Z HI-Z INPUT AMP MICROPHONE AMPLIFIER OUTPUT DRIVERS +130V -20dB CH 2 O
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Warranty Information Grace Design warrants all of our products to be free of defective parts and work- manship 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
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Manual Revisions Revision Page Change Date Initials A Initial release 04/25/2007 mbg B 3 Changed voltage range and power specifications 04/26/2007 mbg B 4 Power switch description changed to standby switch. 04/26/2007 mbg B 6 Added power mains disconnect information 04/26/2007 mbg B 13 Added signal flow diagram 04/26/2007 edg C 9-12 Added A/D module infirmation 11/08/07 edg D 7 changed fuse values for 220V-250V from 250 to 315mA 4/24/08 edg grace design m201 20 owner’s manual
