Bass Box DI
A Mystic Valley Audio product: a hand-made replica of Bruce Swedien’s DI box.
- Section
- 08.1
- Filed under
- Mario Mics
- Location
- Medford, Mass.

01
Overview
The Bass Box replicates the DI box that Bruce Swedien said he used on virtually every bass track since the late 1950s, including records by Michael Jackson, the Brothers Johnson and George Benson.
It reduces bass “clank” and string noise, with a buttery-smooth tone and deep low end. It’s great on synth, too. Sound samples comparing it directly with an industry-standard Jensen DI are available on request.
02
Construction
Hand-made, using Lundahl’s clone of the UTC LS-10X transformer, with gold Pure Tone input jacks, a gold Neutrik XLR output, and silver wire and silver solder, in a classic Bud Industries “Bud-Box” enclosure.
03
Availability
Sold out. Another batch is expected in winter 2027. To ask about the next batch, email alex@mysticvalleystudio.com.