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model model
101 101
MICROPHONE PRE
email: info@gracedesign.com web:
Revision B
-
TRIM GA IN
POWER HPF OdB 1OdB 6OdB 1OdB 48V HI Z
, Lunatec LLC 2000 © Copyright April, 2001
www.gracedesign.com
fax: 303.444.4634 voice: 303.443.7454
PO Box 204 Boulder, CO. 80306
OWNERS MANUAL
AMPLIFIER
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Thank you for purchasing the Model 101 microphone preamplifier. It is designed to be extremely reliable and easy to use . However, we ask that you take the time to yourself with some of the more important operation in this manual avoid most common user Regardless of what audio sources you plan to record, the Model 101 will faithfully serve as an invisible link between your microphone or instrument and recording device. We hope it helps you achieve a new level of excellence in your Feel free
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MODEL 101 FE • • TRS • • • • • • • • • • • 2 Sealed gold contact relay for instrument/mic switching Gold plated XLR input and output connectors High precision active balanced output circuit Ultra high resolution transimpedance gain stage Minimal internal signal wiring capacitors in the signal path. electrolytic No conditions two color LED peak meter shows signal present and peak pass filter 75Hz 12dB/octave transitional Thompson-Butterworth high High quality conductive plastic 10dB
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NEL CONTROLS FRONT Each gain control has 11 positions and adjusts the voltage on the microphone input from 10dB to 60dB in 5dB steps. When using the instrument input, the gain range is – B to 40dB in 5dB steps. If you ordered the high gain version of the 101 for use with ribbon microphones , the gain range of your unit on the microphone input is 20dB to 70dB in 5dB steps and the gain range of the instrument input is 0dB to 50dB in 5 dB steps. The trim control provides 10dB of continuous
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l Microphone input connections are made using the female XLR connector on the rear panel. This connector is wired with pin 2 positive, pin 3 negative and pin 1 ground . 48V phantom power, if used, is supplied on pins 2 and 3. l Instrument or line input connections are made using the ¼” TRS jack on the front panel. This connector is balanced with the . l When a jack is inserted into the instrument input , a sealed gold contact relay switches the preamplifier input source from the mic input con
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Cable Termination Diagrams 2 1 D ELD 3 (OPE Figure 1 . P E PRE R D VE E ELD S O NI R Figure 2. POWER SUPPLY CONNECTIONS A 2.1mm jack is used for the DC power input of the 101. The polarity of the jack is positive in the center and ground on the outside. Model 101 is an AC adapter rated for 6VDC @ 800mA. 5 Included with your TRS UNBALANCED OUTPUT CABLE TERMINATION IN PEG SHI SLE GN ING HOT TIP AM ND XLR UNBALANCED OUTPUT CABLE TERMINATION N) SHI GN HOT
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l Turn the gain control fully counter-clockwise, turn the trim control fully clockwise and check that the +48V phantom power is off. l Connect the microphone to the preamplifier and then turn on the phantom power switch on if required. l When sending a signal to a recorder that has fixed input levels, simply increase the gain until the optimum recording level is reached. When sending a signal to a tape recorder with a variable input , use the following procedure: l Turn the gain control fully c
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Model 101 S pecifications Mic input 5dB steps 10-60dB Mic input 5dB steps 20-70dB Hi-Z input 5dB steps -10-40dB Hi-Z input 5dB steps High gain z sion 0-50dB Output trim attenuator 0 to -10dB @20dB Gain +20dBu out <0.00085% @40dB Gain +20dBu out <0.0010% @60dB Gain +20dBu out <0.0050% (SMPTE/DIN 4:1 7kHz/50Hz) @40dB Gain +20dBu out <0.0020 N OISE 50 Ohm source <-130dB 150 Ohm source <-128dB 600 Ohm source <-124dB 100Hz >68dB >75dB >65dB (HPF off) <6 degrees FREQUENCY RESPONSE Mic input
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ES TE 0 d - 1 B u - 2 - 3 20 50 100 200 500 1k 2k 5k 10k 20k 0 d - 25 B - 50 u - 75 - 100 5k 10k 15k 20k 25k FFT @40dB gain, +20dBu out PHASE vs FREQUENCY +40 +30 +20 +10 d 0 e g - 10 - 20 - 30 - 40 20 50 100 200 500 1k 2k 5k 10k 20k Hz Phase response @10 dB gain. 5 0 Ohm sou rce, 100K Ohm load, HPF Off 8 Hz +20 FFPECTRT S UM ANALYSIS +1 75Hz HIGH PASS FIL R RPONSE
