GRACE DESIGN m308
PRICE ON ENQUIRY
GRACE DESIGN m308 fully isolated 8 channel active DI: custom-wound transformers, 1 MΩ inputs, pads, ground isolation, 1U rack. Available in India from Shivansh Electronics, Kolkata, West Bengal, India.
VISUAL GUIDE — See Every Photo, Spec & Setup Step (PDF)
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Electrical specifications
| Gain, pad off / on (13.6 kΩ load) | -6 dB / -19 dB |
| Frequency response ±0.2 dB (50 Ω source) | 82 Hz - 27 kHz |
| Frequency response ±3 dB (50 Ω source) | 20 Hz - 80 kHz |
| THD+N, -10 dBu out, 1 kHz | -102.8 dB (0.00072 %) |
| THD+N, -10 dBu out, 50 Hz | -83 dB (0.0073 %) |
| THD+N, -10 dBu out, 25 Hz | -72 dB (0.023 %) |
| High‑pass filter | 2nd order Bessel, -3 dB at 20 Hz |
| IMD SMPTE/DIN 1:1 / 4:1, -10 dBu out | -106 dB / -99 dB |
Noise and levels
| Output noise, A‑weighted, pad off / on (50 Ω) | -118.6 dBu / -115.5 dBu |
| Output noise, 20 Hz - 20 kHz, pad off / on (50 Ω) | -116.2 dBu / -113.1 dBu |
| Max. input level, pad off / on (1 kHz, 0.1 % THD+N) | +14 dBu / +27 dBu |
| Max. output level, 13.6 kΩ / 3.65 kΩ | +8 dBu / +7.3 dBu |
| Input impedance, pad off / on | 1 MΩ / 115 kΩ |
| Output impedance | 330 Ω |
| Peak LED | +11 dBu (pad off) / +21 dBu (pad on) |
| Power | 48 V phantom power (IEC 61938), 4 mA max. |
General
| Channels | 8 |
| Dimensions (D x W x H) | 165 x 483 x 44 mm (6.5 x 19 x 1.73 in), 1U |
| Weight | 1.817 kg (4 lb) |
| Rack ears | Reversible |
| Warranty | 5 years, parts and labour |
Product overview
The GRACE DESIGN m308 is a fully isolated 8 channel rack-mount active DI with custom-wound transformers, phantom powered, in a rugged 1U extruded aluminium chassis with reversible rack ears, built in the USA.
The m308 is an 8 channel active DI that converts high impedance unbalanced signals to low impedance balanced signals: for passive or active instrument pickups and line level sources such as keyboards, synthesisers and computers. Its high impedance FET input amplifier preserves the tone of passive pickups. The power supply converts 48 V phantom power to an isolated bipolar supply, so the GND-ISO switch completely isolates the instrument input ground from the output XLR ground for the highest rejection of ground induced noise. Custom-wound transformers with a high-nickel core and mu-metal magnetic shield give high headroom, low distortion and protection from hum and buzz.
| Isolated DI channels | 8 |
| Output noise, A‑weighted | -118.6 dBu |
| Response, ±3 dB | 20 Hz - 80 kHz |
| Input impedance, pad off | 1 MΩ |
Key features
- 8 channel, phantom powered active DI with full galvanic isolation
- Custom-wound transformers with magnetic shield
- Ultra low noise output: -118 dBu (A-weighted); 20 Hz - 80 kHz (-3 dB)
- 1 MΩ input impedance; 13 dB input pad per channel
- Per channel peak and power LEDs; THRU jacks for stage amplifiers
- Draws only 4 mA of phantom power per channel; fully ESD and RFI protected
- Rugged 1U aluminium chassis with reversible rack ears; 5 year warranty
Reversible rack ears
The m308 mounts in a standard 19" rack. The rack ears can be fitted on either side by moving three #2 Phillips screws, so either the inputs or the XLR outputs can face the front of the rack, for simple configuration in any stage setup.
Each channel powered from its own XLR
Every channel of the m308 is powered from its own XLR output: the green LED lights when 48 V phantom power reaches it, and the red peak LED flashes 3 dB before clipping.
In the box
- m308 8 channel active DI with rack ears
GRACE DESIGN m308: frequently asked questions
Does every channel need phantom power?
Yes. Each channel is powered from its own XLR output, so apply 48 V to every output used.
Can the rack ears be reversed?
Yes. Remove the three #2 Phillips screws and fit the ears to the other side.
How much does it weigh?
1.817 kg (4 lb); 165 x 483 x 44 mm (1U).
Can it take line level signals?
Yes. With the pad engaged it accepts up to +27 dBu; it must not be connected to power amplifier outputs.
Where can I buy the GRACE DESIGN m308 in India?
The GRACE DESIGN m308 is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.
Workflow 1: Bass guitar DI and stage amplifier
Bass players on stage and in the studio.
Connections
| Connect | To |
|---|---|
| Bass guitar | IN jack |
| THRU jack | Bass amplifier |
| XLR OUT | Mixer or interface input with 48 V |
Setup
- Connect the instrument, amplifier and XLR output.
- Switch on 48 V phantom power at the mixer.
- Check the green power LED.
- Set the level at the mixer.
Tip: Switch 48 V on after connecting and off before disconnecting.
Workflow 2: Stereo keyboard or synthesiser
Keyboard players feeding a PA or recorder.
Connections
| Connect | To |
|---|---|
| Keyboard left / right outputs | Two m308 inputs |
| XLR outputs | Two mixer channels |
Setup
- Connect both keyboard outputs.
- Engage the PAD for high output sources.
- Apply 48 V to each XLR output used.
- Watch the peak LEDs.
Tip: The pad lets the DI accept up to +27 dBu.
Workflow 3: Computer playback into the PA
Live sound with backing tracks.
Connections
| Connect | To |
|---|---|
| Computer audio outputs | DI inputs |
| XLR outputs | Stage box |
Setup
- Connect the computer outputs.
- Use the PAD if needed.
- Set GND-ISO to ISO against hum.
- Bring up the channels.
Tip: Galvanic isolation keeps computer ground noise out of the PA.
Workflow 4: Hum or buzz on stage
Engineers fighting ground loops.
Connections
| Connect | To |
|---|---|
| Instrument | DI input |
| XLR | Mixer |
Setup
- Listen for hum.
- Set GND-ISO to ISO.
- The input ground is isolated from the output ground.
- Check the signal.
Tip: The inputs can be isolated from the outputs, not from each other.
Workflow 5: Passive acoustic guitar pickup
Recording or live acoustic instruments.
Connections
| Connect | To |
|---|---|
| Acoustic guitar | DI input |
| XLR | Interface |
Setup
- Leave the PAD off for passive pickups.
- Apply 48 V.
- Set the preamp gain.
- Record.
Tip: The 1 MΩ input impedance preserves the tone of passive pickups.
Workflow 6: Studio DI for eight channels
Studios recording several line sources at once.
Connections
| Connect | To |
|---|---|
| Line sources | DI inputs |
| XLR outputs | Mic preamps or interface |
Setup
- Patch the sources.
- Apply 48 V per channel.
- Set the pads.
- Record all channels.
Tip: Each channel is powered from its own XLR output.
