1 / 8

8x4 Active Matrix Mixer

from $175.00

A powerful CV/audio mixer and router for the 4U Loudest Warning format. With 8 inputs, 4 outputs, gain control, inversion switches, and multi format jack I/O, it’s perfect for deep signal sculpting, modulation, and feedback routing—whether you're in the studio or on stage.

Choose Option:

A powerful CV/audio mixer and router for the 4U Loudest Warning format. With 8 inputs, 4 outputs, gain control, inversion switches, and multi format jack I/O, it’s perfect for deep signal sculpting, modulation, and feedback routing—whether you're in the studio or on stage.

8x4 Active Matrix Mixer – 4U Modular Format (Loudest Warning)

The 8x4 Active Matrix Mixer is a high-performance signal routing tool built for the 4U Loudest Warning (LW) modular ecosystem. With 8 inputs and 4 independently addressable outputs, it enables complex mixing, modulation, and feedback patching—ideal for both CV and audio-rate applications.

Each input features an active gain stage, adjustable up to 2x gain via dedicated attenuators (unity gain at 12 o’clock, 2x fully clockwise). Signal routing is handled through a flexible matrix of 3-position toggle switches, allowing each input to be sent to each output as On, Off, or Inverted. This configuration supports detailed control over signal summing, phase cancellation, and voltage inversion, making the mixer a creative powerhouse for deep patching.

External I/O Integration:

  • Input 8 and Output A include 1/4" jacks for interfacing with pedals, synths, or outboard gear.

  • An internal trimmer allows fine-tuning of Output A's 1/4” out level for optimal external signal matching.

  • Can be built with Banana Jacks OR 1/8” jacks for inputs or Outputs.

Build Options:

  • Mixers are hand-built to order, shipping in 2–3 weeks (depending on parts availability or build backlog).

  • A desktop version is available in a rugged 2” aluminum boat, powered by a 9–15V DC wall wart (included).

  • Ships standard with 1900H-style knobs; Davies 1910 knobs are available upon request at checkout.

Whether you're shaping control voltages or sculpting audio, the 8x4 Active Matrix Mixer offers unmatched flexibility in a compact, performance-ready design.

Specifications:

  • Inputs: 8 active inputs w/ up to 2x gain (Input 8 also features 1/4" jack)

  • Outputs: 4 buffered outputs (Output A features 1/4" jacks with level trimmer)

  • Dimensions: 7”H x 9”W x 1”D (9 columns wide in 4U LW format)

  • Power Draw: +12V @ 30mA / -12V @ 30mA

** 4U Modular is a term commonly used for the format most commonly know as “Serge Format” or “Loudest Warning Format”.
Out of respect for the ever growing format, 4U Modular is the easiest way to refer to it. More Specifically it refers to the panel height and
mounting hole style. 4U Modular will patch up just fine with other 4U Serge formats such as Random Source, but it will not
mount in RS boats or Buchla Boats (or power off Buchla power for that matter). An info page about this will be added to the website
soon to make this a lot more easy to understand.