UnderTone Audio MPDI-4

19” rack mount Class A four-channel mic preamp and DI
UnderTone Audio MPDI-4
UnderTone Audio MPDI-4 UnderTone Audio MPDI-4 video
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The Power Of Flexibility And Control

Created by Eric Valentine’s UnderToneAudio, the MPDI-4 is a mic pre for audio enthusiasts who like to have lots of control over the recording process. With a limitless amount of options for developing different sounds, this single rack space unit actually has four individual mic pre/DI circuits. Each input is versatile and can be used as a ¼” or XLR connection to make plugging in that much easier.

Vintage Meets New

With the goal of creating a preamp that matches classic consoles, while still offering digital audio cleanliness, UTA has brought a wide sonic palette to the table. Utilizing the same pre amp circuitry as their signature mic pre featured in the MPEQ-1, this new innovation builds off the original with some added extra special features. Thanks in part to a plethora of front panel options, the unit is capable of creating everything from organic distortion to crisp, clean audio with maximum headroom/minimum harmonic distortion.

Front Panel Glory

The MPDI-4 is one preamp that can fit into any studio situation. The output transformer is bypass-able via a switch on the front panel (instead of having an alternate output on the back), while a “load” switch adds extra harmonic coloration to the circuit. Via the unit’s output pad, engineers can drop the level by 10dB, making it possible to hit the mic pre harder and not clip digitally on your DAW. The traditional Mic Gain rotary switch offers gain in 5dB steps from -10 dB to -60db.


Additional Information

Condition New
Channels 4-Channel
Chassis 19-in Rackmount
Module Slot Count 1 Slot

A transparent preamp with all the flexibility one could ask for. Pure efficiency in a 1U rack.

By Brandt G on February 8, 2019

Awesome preamps

By Norma T on February 7, 2019

The ability to drive the pres on drums makes them a rock drum punch machine. You can get all sorts of tones based on how hard you drive them. I got hip to them after seeing that one of my favorite studios, the Blasting Room, in Fort Collins, CO had a full on rack of these units. Scotty from VK (great guy BTW) hooked up a demo for me and man was I blown away! Now I just need to sell more gear so that I can afford another unit! I can't use anything else on drums after these.

By John D. on May 4, 2017

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