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POWER-MU
A Digitally Controlled Stereo
Vari-Mu Compressor

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Full Analog Circuitry with

Complete Digital Recall & Control.

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Locomotive POWER-MU

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POWER-MU is a true stereo vari-mu tube compressor module designed to be used in the Sepia® By Karno L6 Modular Hardware platform. Read about the Sepia® L6 here.

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POWER-MU's graphical user interface allows the user to control the stereo compression circuit inside a two-space module. Your audio will only pass through analog circuitry and nothing else!

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POWER-MU's tubes and transformers will give your audio the familiar sound and  vari-mu character that no other type of compression can achieve.

SEPIA is a game-changing platform comprising of Modules and Hosts, representing a revolutionary approach to analog signal processing. Modules are developed and produced by leading manufacturers worldwide (known as Platform Partners), using their original designs and components meaning no emulation or sonic compromise. These modules have adopted a new, smaller and more rugged form factor designed for all scenarios. Housing these modules are hosts. Designed for all scenarios, hosts utilize Karno's patent-pending Bridging Signal Flow technology to ensure a purely analog signal path. With fully digital control, the SEPIA control software brings these sought-after sounds into the modern workflow.

Sepia® By Karno L6 Modular Hardware Platform 

$1499

SEPIA POWER-MU ORDERS SHIP WITHIN 1 WEEK

TRANSFORMERS

Custom interstage transformers allow for smooth compression without harsh artifacts 

AC & DC THRESHOLD

These threshold controls work together to set compression onset, knee and ratio, giving abundant control over tube drive

TUBES

Each channel uses a NOS dual triode for true vari-mu compression and tube harmonics

SIDECHAIN LOW CUT

Cut low frequencies from the sidechain in order to prevent unwanted compression

STEPPED CONTROL

The high resolution digital knobs on the Power-Mu allow for performances to be recalled with precision

HARDWIRE BYPASS

This switch allows the user to toggle between original and affected signals

STEREO LINK

Force the same gain reduction on the left and right channel to stabilize the center image

POWER SWITCH

Save tube life and 500 series chassis power by turning off the power when not in use

LIFETIME WARRANTY

As an audio engineer, we know you want to use the best tools to shape your sound. And if you are going to spend money on gear, you deserve hardware that's always in tip-top shape. You shouldn't have to worry about when something goes wrong. Rest assured, we guarantee the gear we build by backing it with a lifetime warranty.

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© 2026 LOCOMOTIVE AUDIO - ALL RIGHTS RESERVED

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