A Designs 503HR 1U 3-Slot Chassis External PSU + Bonus

A Designs 503HR 3-slot 1U chassis in excellent condition.

High-quality external universal power supply minimizes noise.

* High-end 1U x 3-slot, perfect for convenient studio rack mounting or as a portable channel strip.
* Excellent condition with a few minor rack scratches on the top and bottom panels.
* No scratches or marks on the faceplate.
* 100% reliable, noise-free operation.
* Professionally modified in 2025 to accommodate full-width modules (see photo 8).
* Used exclusively in a non-smoking home studio.
* Includes one Radial blank plate.

Technical Specifications and Features
* 3-slot 500 Series chassis.
* High-quality external universal power supply provides ample power and minimizes power supply noise.
* Internal routing switches for multiple configurations:
    * All 3 slots independent.
    * Slot 1 direct feed to Slot 2 (Slot 3 solo).
    * Slots 1-3 chained directly without cables.
* Three LED power status indicators (+16V, -16V, 48V).
* Professional modification in 2025 allows proper accommodation of full-width modules, not just flat-board types (see photos).
* I tried three different chassis before this unit, and all had issues with not supplying enough power to certain units or introducing audible signal noise. This unit has none of those problems and is 100% reliable and noise-free.

Ideal for engineers and producers who need a reliable and flexible 500 Series chassis with excellent power delivery and routing options.

Selling as I am downsizing my studio gear due to working solo.

Please feel free to ask any questions!