m308 8-Channel Active DI Rack Unit

The m308 expands the Grace Design DI family into a high-density, rack-mount format designed for studios, touring rigs, and fixed installations that require multiple channels of uncompromising direct input performance. Built on the same core circuit design as the widely trusted m303 and m303S, the m308 delivers the same open, musical sound and rock-solid reliability—now across eight channels in a single chassis.

Engineers who rely on the m303 for its clarity, low noise, and exceptional low-frequency response will feel immediately at home with the m308. Each channel is built around the same active, fully isolated architecture and custom Lundahl transformer design, preserving instrument tone while providing the headroom and dynamic range needed for modern stage and studio environments.

The m308 is purpose-built for applications where large numbers of DI channels are required without compromise—keyboard rigs, bass and guitar systems, playback racks, touring productions, live broadcast, and studio tracking rooms. By consolidating eight premium DI channels into a single rack space, the m308 simplifies wiring, improves reliability, and ensures consistent sonic performance across every input.

Proven Grace Design DI Performance

Grace Design has earned its reputation for transparent, musical signal paths by focusing on the elements that matter most: power supply design, transformer quality, and carefully engineered analog circuitry. The m308 carries forward this philosophy, using the same Lundahl transformer topology found in the m303 series to deliver deep, controlled low end, extended bandwidth, and extremely low distortion.

The result is a DI solution that captures instruments exactly as intended, providing a clean, detailed signal that responds exceptionally well to downstream processing such as EQ, compression, saturation, and re-amping.

Designed for Stage, Studio, and Installation

Whether deployed in a touring rack, a permanent installation, or a high-channel-count recording facility, the m308 is built to withstand years of demanding use. Its rack-mount format, rugged construction, and efficient phantom-powered active design make it equally at home at front-of-house, in a machine room, or in a control room rack.

With eight channels of consistent, transformer-isolated DI performance, the m308 eliminates the variability and clutter of multiple standalone DI boxes while delivering the sonic quality engineers expect from Grace Design.

Key Features

• Eight-channel active DI in a single rack-mount chassis
• Same core circuit design and sonic performance as the m303 and m303S
• Custom Lundahl transformer outputs for exceptional clarity and low-frequency control
• Fully isolated, active DI architecture
• High headroom and wide dynamic range
• Designed for studio, live sound, touring, and fixed installations
• Ideal for keyboards, bass, guitars, playback systems, and instrument racks
• Rugged construction with signature Grace Design industrial finish
• Phantom-powered operation
• Backed by a 5-year transferable warranty
• Made in the USA