Grace Design m101


Grace Design m101

One. Perfect. Channel.

Maintaining Grace Design pedigree throughout, the m101 employs Grace Design’s balanced, transformerless, transimpedance circuit topology. With incredible bandwidth and headroom, the m101 is natural, musical, and detailed, allowing engineers and musicians to consistently record vibrant, amazing tracks.

The m101 is equipped with Grace Design’s new 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 Grace Design’s unique Ribbon Mic Mode, which bypasses the input decoupling capacitors, raises the input impedance from 8.1kΩ to 20kΩ, and defeats the 48V phantom power, preventing damage to delicate ribbon mic elements. Ribbon mics, you’re welcome.

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 precision 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.


  • 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
  • THD+N
    • @ 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
    • 50Ω source: <-130dB
    • 150Ω source: <-128dB
    • 600Ω source: <-124dB
  • CMRR
    • 100Hz: >68dB
    • 1kHz: <75dB
    • 10kHz: <65dB
  • Phase Deviation (HPF Off)
    • 50Hz-25kHz: <6 degrees
  • Frequency Response
    • 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
  • Impedances
    • Mic input: 8.1kΩ
    • Mic input, Ribbon mode: 20kΩ
    • Hi-Z input (unbalanced): 1MΩ
    • Hi-Z input (balanced): 2MΩ
    • Balanced Outputs: 300Ω
    • Unbalanced Outputs: 150Ω
  • Peak LED Meter
    • Green Threshold: -14dBu
    • Red Threshold: +16dBu
  • Maximum Output Level
    • 100k Ohm load, 0.1% THD: +25dBu
  • Weight and Dimensions
    • 2.4 lbs, H1.7” x W8.5” x D9.0”
    • 1.09 kg, H4.3cm x W21.6cm x D22.8cm
  • Power Consumption
    • 100-240VAC, 5 Watts Max

All specifications subject to change without notice.