This pre owned item is in good condition with a few signs of light wear.

The Radial J48 is a professional active direct injection (DI) box designed for live sound and studio recording. Powered exclusively by 48-volt phantom power from a mixing console or audio interface, it converts high-impedance instrument signals into balanced, low-impedance microphone-level signals while preserving the natural tone and dynamics of the source.

The J48 features a high-headroom active circuit with a proprietary switching power supply that raises the internal operating voltage, allowing it to handle high-output active basses, acoustic instruments with onboard preamps, keyboards, and other instruments without distortion or clipping. This design provides exceptional clarity, a wide frequency response, and very low noise.

The front panel includes the following controls:

• -15 dB Pad – Reduces the input level for high-output instruments.
• Merge – Combines two input signals into a single mono XLR output.
• 180° Polarity Reverse – Reverses signal polarity to help solve phase issues.
• 80 Hz High-Pass Filter – Reduces low-frequency rumble and stage resonance.
• Ground Lift – Eliminates hum caused by ground loops while maintaining phantom power.

The J48 is built for demanding professional use with a heavy-duty 14-gauge steel enclosure, a protective book-end design that shields the switches and connectors, and an internal I-beam construction for long-term durability. It features a ¼-inch input and thru output, along with a balanced XLR output for connection to mixers, microphone preamps, or audio interfaces.

Widely regarded as an industry-standard active DI box, the Radial J48 is valued for its transparent sound, exceptional headroom, and reliable performance in touring, broadcast, and professional recording environments.