Radial P-Clamp Flange Mount Adaptor for Small Radial DI Boxes

Radial P-Clamp: Bolt Your Direct Box Down for Good

The Radial P-Clamp is a flange-mount adaptor that lets you permanently affix a smaller Radial J-Class box — such as the ProDI, SGI, ProRMP, SGI-15V, or McBoost — to a desktop, podium, or rack shelf. It replaces the box's outer book-end shell with a steel bracket whose two side flanges bolt straight down to any flat surface, turning a portable direct box into a fixed, tamper-resistant install. For anyone who has watched a critical DI walk off a lectern or shift mid-event, that peace of mind is the whole point.

How the P-Clamp Installs in Minutes

Installation is deliberately simple: you remove the four outer screws that hold the box's book-end shell, slide the inner frame into the P-Clamp, and refasten it using the very same hex screws. No soldering, no adhesives, and no modification to the audio circuit. Once the frame is seated, the two flanges on either side give you solid bolt-down points so the unit stays exactly where you put it, gig after gig.

Which Radial Boxes It Fits

The P-Clamp is sized for Radial's smaller enclosures — the ProDI and Pro48 direct boxes, the SGI and SGI-15V guitar interface line drivers, the ProRMP reamper, and the McBoost mic signal booster. Larger regular-size J-Class boxes like the JDI and J48 use the companion J-Clamp instead, so match the clamp to the footprint of the box you intend to mount.

Who the P-Clamp Is For

The P-Clamp belongs in permanent-install environments where a direct box needs to stay put: houses of worship, boardrooms, lecterns and podiums, broadcast desks, and equipment racks in AV systems. Installers and systems integrators use it to lock down signal-chain hardware for security and cable management, while touring techs bolt boxes into custom panels for repeatable, roadworthy rigs.