UnderTone Audio MPEQ-1

19 inch rack mount Class A mic preamp, equalizer and DI

UnderTone Audio MPEQ-1
UnderTone Audio MPEQ-1 UnderTone Audio MPEQ-1 UnderTone Audio MPEQ-1 video
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The UnderToneAudio MPEQ-1 is the amalgamation of the UTA EQ and UTA's new custom mic pre. You can use the equalizer and the mic pre separately or as a complete channel strip.

The mic pre has a custom input transformer and a carefully chosen output transformer. Both are optimized to accentuate the most flattering sonic qualities inherent in audio transformers.  The unique mic pre design makes both of the transformers bypass-able.  This offers users a choice between the detailed clarity of a Class-A transformer-less design or the vintage musicality of a dual transformer mic preamp.



  • -10 to -60 dB boost range (in stepped 5 dB increments)
  • Switchable 20 dB pad
  • Instrument DI
  • Front panel XLR–1/4" (DI) combo input
  • Phase reverse switch
  • + 48 V phantom power
  • +/- 10 dB trim knob
  • Bypass-able input and output transformers
  • Ability to use mic-pre and UTA EQ on seperate signals.
  • Inputs/Outputs (all XLR):
    • Mic-pre Input
    • Mic-pre direct Line Output
    • Line Input
    • EQ Line Output - w/ output transformer
    • EQ Line Output - w/o output transformer



Input Impedance:

  • Mic In transformerless: 2K ohms 
  • MIc In 200 Ω: 2K ohms 
  • MIc In 50 Ω: 500 ohms 
  • Line In: Greater than 10K


Output Impedance: 

  • Mic Out: 47 ohms 
  • Main Out Transformerless: 47 ohms 
  • Main Out with Transformer: 120 ohms


Frequencey Response:

  • Mic Preamp: 10 Hz - 80 kHz +0 /-1 dB 
  • Line In/Out: 10 Hz - 50 kHz +0 /-1 dB


Noise Floor:

  • Mic Preamp: -128 dBu (20 Hz - 20 kHz) 
  • Line Level Circuit: -91.5 dBu (20 Hz - 20 kHz)


Max Level Before Clip:

  • Mic Preamp: +27 dBu (or better) 
  • Line Level Circuit: +27 dBu (or better)



  • Mic Preamp: .003% at +27 dBu 
  • Line Level Circuit: .015% at +27 dBu 



  • Front to Back: 12.25” (with heat sinks and knobs: 14”)   
  • Left to Right:  17.25” (with rack ears: 19”)


Weight: 10 lbs 


Additional Information

Condition New
Chassis 19-in Rackmount

I find the UnderTone MPEQ-1 to be an extremely useful marriage of artistic creativity and technology. Simply beautiful. I never hesitate to reach for that pre, or heck, even just the EQ section (you can use them separately or together) This box is precise, flexible and the EQ is amazingly comprehensive. I mean, how many preamps have a low pass section on the EQ? Great for guitar amps or anything with unwanted high frequencies. For example, Ive noticed that my vintage 1176 performs better when I filter out anything above 20k, especially when Im using a mic that goes to 40k (Earthworks QTC40. The 1176 seems to not enjoy having to react to all that energy above what is audible.) You can even change the slope of the low pass filter!

I can drive the transformer of the mic preamp for some wonderful color, dial it back all the way to super clean, or even use the transformerless output for astounding transparency. Theres also a transformerless option when choosing microphone impedance. I love ribbon mics thru it, tube LDCs, and everything else. Ive yet to be disappointed, so kudos to Eric V and UTA. I can get just about any sound I want from this box. I would say it has the classy beauty and depth of a D.W. Fearn, the transparency of a Grace Design (if wanted) or the classic color of Chandler or of our Studer console, all in one box. I dig.

And I sure do like this trend of engineers and producers making great audio tools for other artists to create art. Thanks, and please don't stop!

By Tom on February 16, 2018

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