Radial Engineering J-Class JDX-48 Guitar Amp

Guitar Amp Direct Box for True Amplifier Tone

The Radial JDX-48 is a phantom-powered guitar amp direct box designed to capture the real sound of your amplifier and deliver it directly to a PA system or recording interface. Instead of relying solely on microphones, the JDX-48 connects between your amplifier and speaker output to provide a consistent, controlled, and authentic amp tone for live sound and studio recording.

Class A Circuitry with Integrated Cabinet Emulation

Built around a discrete Class A signal path, the JDX-48 preserves the harmonic detail, punch, and dynamic response of a guitar amplifier. Multi-stage filtering and speaker cabinet emulation shape the output to match the sound of a properly miked guitar cabinet, allowing engineers to achieve a natural, mix-ready guitar tone without additional processing.

Reliable Direct Feed for Live Sound and Recording

The JDX-48 is especially useful in situations where microphone placement is difficult or stage volume must be controlled. It delivers a balanced XLR output with consistent tone night after night, making it ideal for touring musicians, houses of worship, and professional live sound applications. Engineers can also blend the direct signal with a microphone for added depth and control in the mix.

Phantom Power Operation with No External Supply Needed

Powered directly by standard 48V phantom power from a mixing console or audio interface, the JDX-48 eliminates the need for batteries or external power adapters. This simplifies setup, reduces stage clutter, and ensures dependable operation in professional environments where reliability matters.

Built for High-Power Amplifier Outputs

Designed to handle high-output tube and solid-state guitar amplifiers, the JDX-48 safely manages speaker-level signals without compromising sound quality. Its robust internal design ensures stable performance even at high volume levels, making it suitable for demanding live and studio workflows.

Road-Ready Construction for Professional Use

Housed in Radial’s heavy-duty steel enclosure, the JDX-48 is built for long-term reliability on tour and in permanent installations. Premium components, solid connectors, and Radial’s proven build quality make it a dependable tool for guitarists and audio engineers alike.