Radial Engineering HDI Studio-Grade 1-Channel Active Instrument Direct Box with High-Definition Preamp and Transformer Isolated Output

The Radial Engineering HDI is a studio-grade active direct box designed to deliver exceptionally detailed, high-definition instrument tone for professional recording and high-end live sound applications. Built as a premium front-end signal processor, it combines a pristine Class-A preamp with transformer-based output circuitry to provide both transparency and musical coloration when desired.

At its core, the HDI features a high-resolution preamp stage that captures the full dynamic range and harmonic detail of instruments such as electric bass, guitar, keyboards, and studio sources. It also includes a selectable transformer saturation control, allowing users to add subtle analog warmth, harmonic richness, and natural compression when a more vintage-inspired tone is desired.

The unit provides a transformer-isolated balanced output for clean, noise-free signal transfer to recording interfaces, mixing consoles, or broadcast systems. In addition, a dedicated line output offers flexible routing options for simultaneous recording or amplifier feeding.

Housed in a rugged, professional-grade enclosure, the HDI is engineered for studio precision while remaining robust enough for demanding live environments.

Key Features:

• Studio-grade active direct box with high-definition preamp
• Captures full dynamic range and harmonic detail
• Selectable transformer saturation for analog warmth and color
• Transformer-isolated balanced output for clean signal transfer
• Additional line-level output for flexible routing
• Designed for electric guitar, bass, keyboards, and studio sources
• High-headroom Class-A circuitry for ultra-clean performance
• Rugged metal chassis for professional studio and touring use