Radial Engineering JDI Mk3 Passive Direct Box

Radial Engineering JDI Mk3 Passive Direct Box

Elevate your live sound and studio rig with the Radial Engineering R800 1010 JDI — a premium passive direct box designed to deliver ultra‑clean, transparent signal conversion from instrument to PA or console. Built for professionals who demand pristine audio fidelity and rock‑solid reliability, the JDI uses a world‑class Jensen® transformer and an all‑steel chassis to deliver the natural sound of your instrument with maximum durability and minimal noise, Whether you’re running a guitar, bass, keyboard or other high‑output instrument, this direct box gives long cable runs and complex stage setups the clarity and isolation they need. With its passive design (no power required), it’s ideal for gigging, touring and studio use. The Radial JDI handles extreme signal levels without distortion, rejects hum from ground loops, and maintains phase‑coherent response — making it one of the finest passive direct boxes on the market.

Key Features

• Jensen® JT‑DB‑EPC nickel‑lami­nated audio transformer for ultra‑linear, low‑distortion signal conversion. 
• Ruler‑flat frequency response (10 Hz–40 kHz) ensuring accurate reproduction of your instrument’s true tone
• Virtually zero phase deviation and harmonic distortion (phase deviation ~0.3° @ 100Hz) — meaning your signal remains coherent and punchy.
• Heavy‑duty 14‑gauge steel I‑beam chassis with welded internal structure — built for the road and harsh live‑sound environments.
• Ground‑lift switch, polarity‑reverse switch, input pad (for high‑level signals) and “THRU” / merge options for flexibility in stereo/mono configurations.
• Fully passive operation — no batteries, no phantom power required. Perfect for simplicity and reliability