Grace Design m103 Single Channel Channel Strip Microphone Preamp with Equalizer and Compressor

The m103 from Grace Design is a powerful tracking tool for virtually any recording situation, featuring a transformerless microphone preamplifier, 3-band EQ and an opto compressor. True to the manufacturer's heritage, the unit delivers exceptional headroom, along with musical detail and clarity. Additional features include a ribbon microphone mode, a 75Hz high-pass filter, and +48V phantom power.

The 3 band EQ section is built around single stage parallel tuning architecture, which minimizes circuitry and delivers natural, musical tonal shaping at all frequencies. Controls include a fully parametric mid-band, with shelving and peak modes on the high- and low-bands. The compressor circuit is based on an optical attenuator - the purest, high fidelity gain control mechanism available. It provides gentle limiting to fairly heavy compression, while remaining neutral and transparent.

Features:

Fast and musical transimpedance microphone preamplifier architecture
Updated audio path with 0.5% precision metal film resistors
12 position gold plated rotary gain switch
High performance output line driver amplifier and HPF amplifier
Ribbon microphone mode (also great for dynamic mics)
Microphone amplifier direct output
Sealed gold contact relay for Hi-Z input switching
Relay bypass of phantom power, decoupling capacitors, increased input impedance, and 48V lockout
3-band precision EQ, fully parametric mid-band, with peak and shelf mode for the high- and low-bands
Optical compressor
Separate line input for the EQ/compressor section
LED indicators for +48V, ribbon mode, and high-pass filter
Powerful 10 segment meters for gain reduction and output level
Built in power supply
Made in the USA

GAIN RANGE (5dB steps)
Mic input	10-65dB
Hi-Z input	-10-45dB
THD+N 1kHz, 22Hz-22kHz BW
@ 20dB Gain +20dBu out	<0.00085%
@ 40dB Gain +20dBu out	<0.0010%
@ 60dB Gain +20dBu out	<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
50 Ohm source	<-130dB
150 Ohm source	<-128dB
600 Ohm source	<-124dB
CMRR @60dB Gain, 3.5Vcm
100Hz	>60dB
1kHz	>75dB
10kHz	>65dB
FREQUENCY RESPONSE
Mic input @ 40dBm Gain -3dB	3.7Hz-140kHz
Hi-Z input @ 20dB Gain -3dB	1.2Hz-112kHz
IMPEDANCE
Mic input	8.1kΩ
Mic input, Ribbon mode	20kΩ
Hi-Z input (unbalanced)	2.5MΩ
Hi-Z input (balanced)	5MΩ
Balanced Output	300Ω
Unbalanced Output	150Ω
PEAK LED METER
Green threshold	-10dBu
Red threshold	+16dBu
MAXIMUM OUTPUT LEVEL
100k Ohm load, 0.1% THD EQ/COMP Section	+28dBu
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	0.5 - 5
High Frequency Range	3kHz 20kHz
Switches	Low and High Frequency Peak/Shelf
Compressor Inserts Pre or Post EQ
Threshold Range	-15 - +15 dBu
Attack Range	3 - 200 ms
Release Range	0.03 - 3 s
Ratio Range	1:1 12:1
Gain Reduction	0 10dB
Output
THD+N 1kHz, 22Hz-22kHz BW @ 0dB Gain +20dBu out	<0.002%
INTERMODULATION DISTORTION @ 0dB Gain +20dBu out; SMPTE/DIN 4:1 7kHz/50Hz	<0.002%
OUTPUT NOISE 22Hz-22kHz BW @0dB Gain	<-78dB
CMRR @0dB Gain, 3.5Vcm
100Hz	>75dB
1kHz	>75dB
10kHz	>75dB
FREQUENCY RESPONSE @0dB Gain -3dB	0.016Hz-150kHz
IMPEDANCE
Line In	24kΩ
Main Out balanced	350Ω
Main Out unbalanced	150Ω
Link In sidechain mode	100kΩ
LEVEL METERS
EQ Peak threshold	6 dB below interstage clipping
Output Level VU Meter	0dB VU = +4dBu 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 x W19 x D9.0
2.05 kg	H4.3cm x W48.3cm x D22.9cm
POWER CONSUMPTION
85-264VAC / 120-370VDC	14 Watts Max

Comprehensive input and output options allow the microphone preamp and EQ/compressor section to be accessed independently of each other, with the order of the EQ and compressor switchable. The compressor controls can be linked for stereo applications, and 10 segment gain reduction and output meters make monitoring signal status simple.

The front panel accessed HI-Z input makes this an amazingly high quality instrument preamp. Comprehensive I/O options allow the mic pre and EQ/COMP sections to be accessed independently of each other, and the order of the EQ/COMP is switchable. A dual function link/ sidechain input on rearpanel is provided for inserting external sidechain signals (for de- essing, ducking) or connecting two m103's together for stereo compression applications.

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