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
Sound Pure stands behind our products. Free three-year warranty on this item. Coverage exclusions live in Terms & Conditions, Section 27.
Level of support and expertise that simply isn't available at big-box megastores. Read the warranty →
Returns
This item is not eligible for the Try-Before-You-Buy 48-hour audition. Standard return policy applies — see Terms & Conditions, Section 18 for details.
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