Radial Engineering JCR The Original John Cuniberti Re-amp Box Re-invented

Radial Engineering JCR The Original John Cuniberti Re-amp Box Re-invented
The Radial JCR is a passive reamp box based on John Cuniberti’s original circuit, converting balanced line-level signals to high-impedance guitar-amp outputs. It features level trim, mute, filtering, phase invert and ground lift in a rugged steel build.

High Performance
The Reamp® JCR is a high-performance passive Reamper that gives you the ability to take a pre-recorded track and send it through a guitar amp or pedal chain, allowing you to explore new sonic textures and experiment with microphone placement, amp and pedal settings without limit. The JCR utilizes the original Reamp circuit designed by recording industry legend John Cuniberti, providing exceptional audio quality that preserves every detail of the original recording while optimizing it to feed amplifiers and effects pedals. The latest Radial version features separate XLR and ¼" TRS input connectors, variable output level plus a three-position filter that lets you tame excessive highs, warm up the lows or simply bypass if you want to revert to the original circuit. An on-board mute function has also been added to allow you to shut off the signal going to the amps when making adjustments or moving mics around the studio.

JCR Applications

• Reamping Part 1 - Reamping usually starts by recording a dry clean track. The Radial J48 DI is an excellent choice for this as it presents the guitar with an ideal impedance for natural tone.
• Reamping Part 2 - Once the dry track is recorded, send it back to the Reamp JCR where it can feed a guitar or bass amplifier. Mic the amp to capture the new tone. Move the mic around to find the sweet spot.
• Adding Pedals - Take things one step further by introducing effects pedals into the mix. Try a wah pedal on kick drum; envelope on snare; distortion on a vocal track. Let your imagination run free!

Features:

• 100 % passive design (no power required) using a custom USA-wound transformer 
• Balanced line-level input via XLR plus a parallel TRS (¼") input 
• Unbalanced instrument-level ¼" output to feed amps or pedals 
• Variable output level (level control) to match signal strength to the amp 
• 3-position filter switch (high-cut / low-cut / bypass) to tame brightness or low-end mud or leave flat 
• Mute switch to silence the ¼" output while adjusting mic placement or making changes 
• Phase (polarity) invert switch (180°) at the output to correct phase mismatches 
• Ground-lift switch (disconnecting pin-1 on XLR input) to reduce hum/ground loops 
• Transformer isolation to break ground loops and provide clean unbalancing 
• Rugged 14-gauge steel “bookend” construction with internal I-beam skeleton for mechanical protection 
• No-slip rubber pad on bottom for mechanical & electrical isolation 
• Operates in dry locations (5 °C to 40 °C)

Specifications:

• Audio circuit type: Passive, transformer-isolated 
• Frequency response: 20 Hz – 20 kHz (±1 dB) 
• Dynamic range: 140 dB 
• Total harmonic distortion (THD): 0.001 % @ 1 kHz, 0 dBu input 
• Intermodulation distortion: 0.0025 % (1 kHz / –10 dB input) 
• Phase deviation: 2° at 100 Hz, 0° at 800 Hz 
• Input impedance: 1,800 Ω 
• Output impedance: 4.8 kΩ 
• Common mode rejection ratio: –55 dB @ 55 Hz 
• Noise floor: –115 dBu 
• Maximum input: +26 dBu 
• Input connectors: XLR (balanced), ¼" TRS in parallel 
• Output connectors: ¼" TS, unbalanced 
• Filters: 3-position (high-cut, low-cut, bypass) 
• Phase switch: 180° polarity invert at ¼" output 
• Mute switch: Silences ¼" output 
• Ground lift: Disconnects input ground (pin-1) 
• Construction: 14-gauge steel, welded I-beam internal chassis 
• Dimensions: 84mm (L) × 127mm (W) × 48mm (H)
• Weight: ≈ 600g
• Operating environment: Dry locations, 5 °C to 40 °C 
• Warranty: 3 years, transferable
• Power: Passive (no external power needed)