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Grace Design M101 Microphone Preamp 

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In 2000, the Grace Design model 101 microphone preamp helped fuel a revolution. When people took professional recording into their own hands, it was ...Click To Read More About This Product

Available 07-04-2017

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See All Grace Design Microphone Preamps

Single-channel, ultra wide-bandwidth preamp with special ribbon mic mode provides remarkable transparent audio quality.

In 2000, the Grace Design model 101 microphone preamp helped fuel a revolution. When people took professional recording into their own hands, it was there with all of the quality and performance of a high-end mic preamplifier, but with a price that made it available to the masses. Eight years later, and the cause moves forward with the newly redesigned m101 preamp.

Maintaining Grace Design pedigree throughout, the m101 employs 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 a redesigned universal switching power supply that's dead quiet and accepts input voltages from 100 to 240V AC. 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's unique Ribbon Mic Mode, which bypasses the input decoupling capacitors, raises the input impedance from 8.1kÎ to 20kÎ, 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 everyone from home recording enthusiast to top professional.

Note: For a truly outstanding sound and value, we suggest using the Grace m1011 with the CAD e300 condenser mic (see (#271261) for amazingly clear and detailed, yet warm-sounding vocals.

  • 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
  • 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 1/4" unbalanced
  • Bombproof laser-etched black anodized front panel
  • 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

M101 Microphone Preamp

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

    Green threshold: -14dBu
    Red threshold: +16dBu

    100k Ohm load, 0.1% THD: +25dBu

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

    100-240V AC: 5 Watts Max

Review Snapshot

by PowerReviews
Grace DesignM101 Microphone Preamp

(based on 3 reviews)

Ratings Distribution

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Reviewed by 3 customers

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(4 of 4 customers found this review helpful)


This preamp is amazing.

By TeleTime42002

from Colorado

Comments about Grace Design M101 Microphone Preamp:

This review is going to read like a press release from Grace Design, but I swear I have nothing to do with the company. Anyhow. Holy cow. This thing is awesome. It was a good value before the new model came out but now they have added an unbalanced out and a ribbon button. Also the wall wart is gone now. If you need a good clean low-noise preamp you are looking in the right place. Everything works perfectly, there is absolutely no noise even with space heaters nearby, and it's a nice rock solid build too. I cannot recommend this device more highly.

(2 of 2 customers found this review helpful)


Want to know what your mic sounds like?

By swordofmorgan

from Richland, Washington

About Me Professional Musician


  • Clean
  • Clear Sound
  • Easy To Use
  • High Gain
  • Low Noise Floor
  • Powerful
  • Solid


  • Not Rack-mountable

Best Uses

  • Home Studio
  • Professional Recording

Comments about Grace Design M101 Microphone Preamp:

If you really want to know what your mics sound like, I recommend the Grace m101. It is the cleanest, most transparent preamp I have ever heard. It does not color like a Neve, API, SSL, Universal Audio, or Focusrite. It the only preamp I have heard actually get out of the way.

(2 of 4 customers found this review helpful)



By Dwain Messer

from Kentucky/Nashville

See all my reviews

Comments about Grace Design M101 Microphone Preamp:

I just recived the Grace a week ago and already I can see an improvement when using it in the audio chain of my home studio. I only gave it an 8 rating because I haven't really had time to use it in a project yet. But while getting use to it with a new microphone that I also purchased, (the MicTek CV4) it has already performed beautifully on guitar/vocal demos that I have created. It produces a really clean, smooth sound in my recordings. I don't think you will be dissapointed in the sound it gets for the price range of this item. As a matter of fact I feel that it can give the higher price pre-amps a run for their money;

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