Grace Design m303 Fully Isolated Active Direct Box

The Grace Design m303 is an active direct box designed to handle the demands of both live stage and studio environments. It features galvanic isolation through a custom-wound Lundahl transformer, ensuring deep bass response and crisp high-frequency details without signal degradation. With ultralow distortion levels (below -100dB at 1kHz) and an impressively wide dynamic range (124dB), the m303 sets a new standard for direct boxes. Its rugged, extruded aluminum chassis is built to withstand heavy use, making it perfect for professional audio engineers who need reliability on the road or in the studio. The m303 also features a peak indicator LED to warn when the signal approaches clipping, along with reduced power consumption for broad compatibility with phantom-powered devices.