J48 - Uncategorized Radial Engineering - Free user manual and instructions
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| Product Type | Active Direct Box (DI) |
| Power Source | 48V Phantom Power (via XLR) |
| Input Connector | 1/4" TS (unbalanced) |
| Output Connector | XLR (balanced, transformer-isolated) |
| Frequency Response | 20 Hz - 20 kHz (±0.5 dB) |
| Dynamic Range | >110 dB |
| Input Impedance | 220 kΩ (unbalanced) |
| Output Impedance | 600 Ω (balanced) |
| Maximum Input Level | +21 dBu |
| Dimensions (W x H x D) | 5.5" x 3.5" x 2" (140 x 89 x 51 mm) |
| Weight | 1.2 lb (0.54 kg) |
| Construction | 14-gauge steel chassis with protective corners |
| Ground Lift | Yes (lifts pin 1 to break ground loops) |
| Polarity Reverse | Yes (180° phase reverse switch) |
| High-Pass Filter | 150 Hz (to reduce low-frequency rumble) |
| Parallel Output | 1/4" thru (for tuner or daisy chain) |
| Included Accessories | Quick start guide, adhesive pad, cable ties |
| Compliance | RoHS, CE, FCC Class B |
| Warranty | 3 years (with online registration) |
| Maintenance | Wipe with dry cloth; avoid moisture and solvents |
| Safety | Use only with phantom power 48V DC; do not immerse |
| Repairability | Designed for service: replaceable switch, XLR, and jack |
Frequently Asked Questions - J48 Radial Engineering
How does the Radial J48 get power?
The J48 is an active direct box that receives 48V phantom power through the XLR output cable. No batteries or external power supply are needed.
Can I use the J48 with a passive guitar pickup?
Yes, the J48 works with passive pickups. Its high input impedance (220 kΩ) preserves the guitar's tone and provides a clean signal.
What is the ground lift switch for?
The ground lift disconnects pin 1 of the XLR to eliminate ground loops and hum caused by differences in ground potential between connected devices.
How does the polarity reverse switch work?
The polarity switch reverses the phase of the signal by 180 degrees, useful for correcting phase cancellation when using multiple microphones or DI boxes.
What is the high-pass filter used for?
The 150 Hz high-pass filter removes low-frequency rumble (e.g., from stage vibrations) while preserving the instrument's bass response.
Can I connect the J48 to a microphone input?
Yes, the J48 outputs a balanced signal at mic level. Connect the XLR to any standard microphone preamp or mixer input.
Does the J48 require a special power supply?
No, it uses standard 48V phantom power as found on most mixing consoles and audio interfaces. Ensure phantom power is enabled on your mixer.
What is the maximum input level of the J48?
The J48 can handle input levels up to +21 dBu, making it suitable for high-output instruments like active basses and keyboards.
Can I use the parallel 1/4' thru output?
Yes, the thru output mirrors the input and can be used to send the signal to an amplifier or tuner without affecting the main XLR output.
How do I clean and maintain the J48?
Wipe the chassis with a dry, lint-free cloth. Do not use any solvents or cleaners. Keep the unit away from moisture and extreme temperatures.
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USER MANUAL J48 Radial Engineering
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Product information
Brand : Radial Engineering
Model : J48
Category : Uncategorized