Detail 01
14-gauge steel enclosure with bookend design
The enclosure is built to protect the switches and connectors from damage.
Product detailSKU #1430146864705
Radial EngineeringJ48 Stereo Active Direct Box
Independent shopping perspective
The Korena take
Built for professional touring and studio recording, the J48 Stereo is an active direct box with a protected steel enclosure and internal I-beam support for its circuit board. Its phantom-powered switching supply is designed for added headroom, lower distortion, and high-output instrument handling across a 10 Hz–40 kHz linear response. A -15 dB pad, 80 Hz high-pass filter, polarity reverse, and ground-lift design give you practical control when cleaning up difficult signals or managing dual-element pickup sources.
Strong match
Who this is for
- Touring and recording setups that need an active direct box for high-output instruments.
- Reducing low-frequency mud or excessive resonance with the built-in 80 Hz high-pass filter.
- Dual-element pickup sources that need polarity alignment or help addressing acoustic feedback hot spots.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
48V phantom-powered switching supply
It converts phantom power to AC to increase headroom for signal handling and lower distortion.
Detail 03
10 Hz–40 kHz linear frequency response
The stated linear response range extends from 10 Hz to 40 kHz.
Detail 04
-15 dB pad
Can be engaged for extreme signal handling.
Detail 05
80 Hz high-pass filter
Gently rolls off frequencies below 80 Hz to clean up mud and excessive resonance.
Detail 06
Side-access 180-degree polarity reverse
Helps phase-align dual-element pickup sources or address acoustic feedback hot spots.
Final check
Know before you order
- 01The switching power supply uses 48V phantom power.
- 02Use the -15 dB pad when extreme signal handling is required.
- 03The polarity reverse is intended for dual-element pickup sources when phase alignment or acoustic hot-spot control is needed.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Does the ground lift turn off phantom power?
No. Its DC-to-DC converter lifts the audio ground at the power supply, retaining phantom power.
02What does the high-pass filter do?
It gently rolls off frequencies below 80 Hz to clean up mud and excessive resonance.
03Can it handle high-output instruments?
Yes. The J48 Stereo is designed to handle high-output instruments, and its -15 dB pad can be engaged for extreme signal handling.
