Grace Design M101
Preamplifier,Single Channel/DI


Our Price: $685.00List Price: $765.00
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The m101 is equipped with a universal switching power supply, which is dead quiet and accepts input voltages from 100 to 240VAC. The front panel is a tough black anodized / laser etched black, which ensures legibility and usability in varying light conditions. And all preamp functions have a dedicated indicator LED, including the 48V phantom power and HPF switch.

Built in as standard is a unique Ribbon Mic Mode, which bypasses the input decoupling capacitors, raises the input impedance from 8.1k ohms to 20k ohms, and defeats the 48V phantom power, preventing damage to delicate ribbon mic elements.

The gain range is 10-75dB, including the additional +10dB of gain available with the output trim control. This provides ample gain for use of any type of microphone in any recording situation. The gain control is a presicion gold plated 12 position switch and the circuit path is built with 0.5% metal film resistors.

Included is a HI-Z input on the front panel. Rear panel I/O options include both balanced TRS and unbalanced TS 1/4” outputs, along with the standard XLR balanced out and XLR microphone in.

Equally at home amplifying a vintage condenser mic or a plugged-in acoustic guitar, the m101 delivers the kind of high fidelity performance previously available only to big budget recording studios and Grammy winning musicians. Add it all up while considering that the price is unmatched and the picture becomes pretty clear – the m101 is one little hot rod piece of pro audio gear for the masses.

Two m101's can be rackmounted side by side in a standard 1U rack tray (not included).
The m101 chassis has a #10-32 threaded insert mounting hole on the bottom towards the back. Two m101s can be mounted side by side in a standard 1U rack tray. Use a #10-32 x 1/2” or a #10-32 x 3/8” machine screw. Do not use a screw longer than 1/2”


  • Fast and musical transimpedance architecture
  • Updated audio path with 0.5% precision metal film resistors
  • New 12 position gold plated rotary gain switch
  • High performance output line driver amplifier and HPF amplifier
  • New Ribbon mic mode (also great for dynamic mics)- Relay bypass of phantom power decoupling capacitors, increased input impedance, and 48V lockout
  • Wider 10-75dB gain range
  • Enhanced RFI interference suppression
  • Three output connectors: XLR balanced, TRS balanced and ¼” unbalanced
  • Bombproof laser-etched black anodized frontpanel
  • Sealed gold contact relay for Hi-Z input switching
  • Built in power supply / no wall-wart!
  • Led indicators for +48V, Ribbon mode, and HPF
  • Five year warranty on parts and labor
  • Made in the USA

GAIN RANGE (5dB steps)
Mic input  10-65dB
Hi-Z input  -10-45dB
Output trim control  0 to +10dB

@ 20dB Gain +20dBu out  <0.00085%
@ 40dB Gain +20dBu out  <0.0010%
@ 60dB Gain +20dBu out  <0.0050%

@ 40dB Gain +20dBu out  
SMPTE/DIN 4:1 7kHz/50Hz  <0.0020

50 ohm  source  <-130dB
150 ohm  source  <-128dB
600 ohm  source  <-124dB

100Hz  >68dB
1kHz  >75dB
10kHz  >65dB

50Hz-25kHz  <6°

Mic input @ 40dB Gain -3dB  4.5Hz-390kHz
Mic input @ 40dB Gain -0.5dB  10.5Hz-140kHz
Hi-Z input @ 20dB Gain -3dB  2.5Hz-195kHz
Hi-Z input @ 20dB Gain -0.5dB  6Hz-74kHz

Mic input  8.1k ohms
Mic input, Ribbon mode  20k ohms
Hi-Z input (unbalanced)  1M ohms
Hi-Z input (balanced)  2M ohms
Balanced Output  300 ohms
Balanced Output  150 ohms

Green threshold  -14dBu
Red threshold  +16dBu

100k Ohm load, 0.1% THD  +25dBu

2.4 lbs  H1.7” x W8.5” x D9.0”
1.09 kg  H4.3cm x W21.6cm x D22.8cm

5 Watts Max


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