The Grace Design m303 Active Direct Box is an active, truly-isolated direct box, delivering next-generation audio performance for all live stage and studio applications.
The Grace Design m303 Active Direct Box provides incredible headroom and dynamic range. A custom-wound Lundahl transformer outputs amazing low-end clarity and high frequency detail. All of this performance is packaged in a beautiful and rugged ¼” extruded aluminum chassis. Don’t let the elegant exterior fool you, this thing is built.
Grace Design m303 Active Direct Box Features
- Phantom powered active DI with full galvanic isolation.
- Custom wound Lundahl transformer, magnetically shielded with a high nickel core
- Ultra-low distortion (below -100dB at 1kHz, below -80dB at 50Hz)
- Ultra-low noise (-118dBu, A weighting)
- Ultra-wide bandwidth 20-80kHz
- Wide dynamic range (124dB)
- Excellent low frequency headroom THD+N @50Hz <-80dB (0.007%)
- 1M Ohm input impedance works with any line or pickup signal source
- Peak indicator LED - 3dB before clipping
- Power indicator LED
- Efficient design only draws 4mA of phantom power current
- Through signal connector
- Fully ESD and RFI protected
- Input pad (13dB) for high level signals
- High-quality gold contact toggle switches
- Very rugged 1/4" wall extruded aluminum chassis, recessed connectors
Grace Design m303 Active Direct Box Advantages
- Signature Grace Design transparent, musical audio performance
- Active design with true galvanic isolation
- World class Lundahl transformer
- Incredibly low distortion and noise with wide dynamic range
- Deep, rock-solid bass response
- 1M ohm input impedance
- Durable, designed for years of reliability
- Backed by a 5 year warranty
- Made in the USA
Grace Design m303 Active Direct Box Includes
- Grace Design m303 Active Direct Box
- Manufacturer Warranty
2 Reviews Hide Reviews Show Reviews
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Grace M303 DI
Apr 6th 2026This DI combined the best attributes of active and passive Dis. Extremely detailed but very musical which I assume is due to the transformer used. If you are looking for a flagship DI for your studio this one should definitely be considered. This M303 should seriously enhance tour direct recorded bass and guitar tracks and give your modeling plug ins something better to work with. Nothing not to like here.
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Grace m303
Feb 15th 2026I give this DI a massive thumbs up. It's price point isn't bad considering how great it sounds. If you want to record a bass that sound so good that you just need to pop a compressor on it in mixdown, this is it. Big, round clear and not stiff at all.
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