J33 - Receiver Radial Engineering - Free user manual and instructions
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| Product Type | Active Direct Box / Preamp for Guitar and Bass |
| Input | 1x 1/4" TS unbalanced |
| Output | 1x XLR balanced, 1x 1/4" TS effects loop send/return |
| Power Supply | 48V phantom power or 9V battery |
| Dimensions (W x D x H) | 5.0" x 3.5" x 1.75" (127 x 89 x 44 mm) |
| Weight | 0.55 lb (250 g) |
| Frequency Response | 20 Hz - 20 kHz ±0.5 dB |
| Total Harmonic Distortion | <0.01% @ 1 kHz |
| Dynamic Range | >110 dB |
| Input Impedance | 220 kΩ (unbalanced) |
| Output Impedance | 300 Ω (balanced) |
| Maximum Input Level | +21 dBu |
| Maximum Output Level | +18 dBu |
| Controls | Pad switch (0/-15 dB), Ground lift, HPF filter (80 Hz), Effects loop level control |
| Construction | Steel chassis, matte black finish |
| Ground Lift | Yes, lift pin 1 on XLR output |
| Pad | 15 dB attenuation for high-level sources |
| High-Pass Filter | 80 Hz, 12 dB/octave |
| Effects Loop | Series, -10 dBV nominal, unbalanced |
| Battery Life | Approximately 300 hours (alkaline) |
| Warranty | 3 years limited, transferable |
| Cleaning Instructions | Wipe with a dry cloth; avoid solvents |
Frequently Asked Questions - J33 Radial Engineering
What is the Radial J33 primarily used for?
The Radial J33 is an active direct box designed for guitar and bass signals, converting unbalanced high-impedance inputs to balanced low-impedance outputs for connection to mixing consoles or audio interfaces.
How do I power the J33?
The J33 can be powered via 48V phantom power from a mixing console or an internal 9V battery. Battery installation requires removing the bottom plate.
What is the ground lift switch for?
The ground lift switch disconnects pin 1 of the XLR output from the chassis ground, helping to eliminate hum and ground loop noise in the audio signal.
Can I use the J33 with active pickups?
Yes, the J33 works with both passive and active pickups. For high-output active pickups, engage the pad switch (-15 dB) to prevent input clipping.
What is the effects loop on the J33?
The J33 includes a series effects loop with a send (1/4" TS) and return (1/4" TS). This allows you to insert external pedals or processors between the input and the XLR output.
How do I engage the high-pass filter?
The HPF switch activates an 80 Hz high-pass filter (12 dB/octave) to remove low-frequency rumble or stage noise. Move the switch to the up position to enable it.
What cables do I need for the J33?
Use a standard 1/4" TS instrument cable for the input. For the balanced output, use a 3-pin XLR microphone cable. The effects loop requires 1/4" TS cables.
Is the J33 compatible with 48V phantom power?
Yes, the J33 is designed to accept 48V phantom power via the XLR output. It automatically switches to phantom when connected; remove the battery to avoid draining it if phantom is used.
What is the maximum input level before clipping?
Without the pad, the maximum input level is +6 dBu. With the pad engaged (-15 dB), it can handle up to +21 dBu, suitable for high-output sources.
How do I clean and maintain the J33?
Clean the exterior with a dry, lint-free cloth. Do not use solvents or abrasive cleaners. Ensure no liquids enter the jacks or switches. Store in a dry place.
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USER MANUAL J33 Radial Engineering
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Product information
Brand : Radial Engineering
Model : J33
Category : Receiver