Radial Engineering J48 Phantom Powered Active Direct Box

Radial Engineering J48 Phantom Powered Active Direct Box

The Radial J48 is a professional‑grade, phantom‑powered active direct injection (DI) box designed for studio and live performance use. With exceptional dynamic headroom, ultra‑low distortion, and a rugged build, the J48 delivers the natural tone of guitars, basses, keyboards and other high‑output instruments without colouration or clipping. Engineered by Radial Engineering, this single‑channel DI box (part number R800 3001) is ideal for artists, engineers and touring sound professionals who demand consistent, clean signal transfer from instrument to mixer or recording console.

Whether you’re on stage, in a rehearsal room, or in the studio, the J48 handles even the most demanding transients (up to 9 V internal rail voltage) while remaining battery‑free (runs off 48 V phantom power). Its premium components and heavy‑duty 14‑gauge steel chassis ensure reliability gig after gig.
Use it to convert high‑impedance instrument outputs to balanced mic‑level XLR signals, tame ground‑loop hum, sum stereo sources into mono, and preserve the full frequency spectrum of your instrument—from deep bass to extended highs.

Key Features

• Fully phantom‑powered (48 V) — no batteries required.
• Unique internal switch‑mode power supply raises rail voltage to ~9 V, providing superior headroom and distortion resistance.
• Handles high‑output active instruments (guitars, basses, keyboards) with ease — avoids clipping or “choking” DIs.
• Ultra‑clean, natural signal transmission: low total harmonic distortion (0.002% @ –5 dBu) and wide dynamic range (109 dB).
• High input impedance (220 kΩ) minimises loading on your instrument.
• Balanced XLR output plus ¼″ input and ¼″ thru‑output for simultaneous send to console and amplifier.
• Pad switch (‑15 dB) lets you handle very hot signals.
• Polarity reverse (180°) switch helps fix phase issues when miking or combining signals.
• Ground lift switch disconnects ground path to eliminate hum/ground‑loop problems.
• Low‑cut (high‑pass) filter (80 Hz) reduces rumble and enhances clarity in acoustic/instrument setups.
• Merge function: transforms Input + Thru jacks into a stereo‑to‑mono sum for mixers.
• Built rugged: welded I‑beam PCB construction, 14‑gauge steel chassis, no‑slip bottom pad — built for touring.