From Grace Design
The all new Grace Design m303 is an active, truly-isolated direct box, delivering next-generation audio performance for
all live stage and studio applications. Our advanced power supply design 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 1⁄4” extruded aluminum chassis. Don’t let the elegant exterior fool
you, this thing is built.
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
m303 advantages over many other DI products
- 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
| m303 Specifications | |
|---|---|
| Gain | |
| Pad Off, 13.6k Ohm load | -6dB |
| Pad On, 13.6k Ohm load | -19dB |
| Frequency Response | |
| ± 0.2dB (50Ω source, 13.6k load) | 82Hz-27kHz |
| ± 3dB (50Ω source, 13.6k load) | 20Hz-80kHz |
| THD+N 20Hz-20kHz BW | |
| -10dBu out, 1kHz | -102.8dB (0.00072%) |
| -10dBu out, 50Hz | -83dB (0.0073%) |
| -10dBu out, 25Hz (10Hz-20kHz BW) | -72dB (0.023%) |
| High Pass Filter | |
| 2nd Order, Bessel | -3dB 20Hz |
| Intermodulation Distortion -10dBu Out | |
| SMPTE/DIN 1:1 (50Hz, 7kHz) | -106dB (0.0005%) |
| SMPTE/DIN 4:1 (50Hz, 7kHz) | -99dB (0.0010%) |
| Noise – Output Level 20Hz-20kHz | |
| Pad Off, 50Ω source | -116.2dBu |
| Pad Off, Input disconnected (equivalent to 330pF source) | -112.3dBu |
| Pad On, 50Ω source | -113.1dBu |
| Pad On, Input disconnected (equivalent to 330pF source) | -113d.0Bu |
| Noise – Output Level A-weighted | |
| Pad Off, 50Ω source | -118.6dBu |
| Pad Off, Input disconnected (equivalent to 330pF source) | -114.9dBu |
| Pad On, 50Ω source | -115.5dBu |
| Pad On, Input disconnected (equivalent to 330pF source) | -115.2dBu |
| Maximum Input Level (0.1% THD+N) | |
| 1kHz, Pad Off | 14dBu |
| 1kHz, Pad On | |
| Maximum Output Level (0.1% THD+N) | |
| Balanced, 1kHz, 13.6kΩ Load | 8dBu |
| Balanced, 1kHz, 3.65kΩ Load | |
| Impedance | |
| Input Pad Off | 1MΩ |
| Input Pad On | 115kΩ |
| Output | |
| Power Supply | |
| 48V Phantom Power, IEC 61938 | |
| Weight and Dimensions | |
| 1.05lb, (0.48kg) - 5.30”L x 3.19”W x 1.73”H (134mmL x 81mmW x 44mmH) |
Free 3-Year Warranty
In addition to the standard included manufacturer warranty, virtually all new products carry our exclusive, industry-leading, absolutely free Sound Pure 3-Year Warranty, which includes parts and labor. It's our way of adding real value to the personal touch our small, dedicated team brings to every purchase.
Coverage exclusions live in Terms & Conditions, Section 27. Read the warranty →
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