The UnderToneAudio MPEQ-1 is an 19 inch rack mount Class A mic preamp, equalizer and DI. It represents 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.

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 

The Gear Rack

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