SM2+2 – Rackmount Stereo Direct Box & Stereo Line Isolator

(1 customer review)


A 1RU stereo direct box on one side and a stereo line isolator on the other.  Get the highest quality passive unit for your studio now!  Equipped with the finest Jensen Transformers!

  • Dimensions: 19in W x 8in D x 1.75in H
  • Weight:

Please note that all our rack mount units are custom built to order.  Please allow 4 weeks for delivery.  Let us know if you need something we don’t currently make….we would love to discuss your needs!


An Essential Studio Tool!

Combining components and features from our SWDI and the DISO+, the SM2+2 is a stereo rackmount direct box AND a stereo line isolator in one unit.  This gives greater flexibility in any studio situation.  It’s all about having tonal options.

The ¼ inch input and thru jacks and XLR output jacks are out of the way on the back panel and routed for the shortest signal path.  Two ground lift switches are also mounted on the back so that they can be easily accessed but tucked away where they cannot be accidentally bumped.  Also located on the back is the mono summing switch for the passive summing network as used in the DISO+, dual line isolator.

For Sequencers and Rhythm Pads too!

Use the SM2+2 in any situation where you need high performing, transformer-isolated DI or Line Isolation/conversion to balanced.  Works fantastically with Keys, sequencers, drum machines, and just about anything else you can connect to it! If you encounter a ground loop, just flip the switch and kill the noise.

Hand-Built with Top Quality Parts

The SM2+2 is all about giving you a clean, clear signal all of the time.  We build them one-at-a-time with point to point wiring. We use the industry benchmark transformers from Jensen, high reliability, all metal connectors from Switchcraft and Neutrik and top shelf sealed switches from Grayhill.  It is backed up with a full 3-year warranty.

1 review for SM2+2 – Rackmount Stereo Direct Box & Stereo Line Isolator

  1. Seyfi

    I am most pleased amd grateful for Charlie Fox creating this product. I use it DISO+ side with my Strymon Iridium and and the sounds I get are magically clean and crisp. I use the other with stereo keyboards and love it too. One stop product for your rig. The care,, enthusiasm that Charlie has is exemplary!👏🏻👏🏻👏🏻🧿👋🏼

    • charliefox951

      Thanks so much Seyfi! We appreciate your kind comments and support!

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