User manual
ProDI-ProD2-manual-2026.pdf
Audio
Radial ProD2
Connect a keyboard or playback source while keeping left and right independent.
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Model and application
- Channels
- 2
- Design
- Passive
- Inputs / THRU
- Quarter-inch
- Outputs
- XLR mic level
- Input pad
- −15 dB
ProD2 contains independent passive DI paths. It needs no phantom power and does not amplify a weak source. It is not an automatic stereo-to-mono merger.
Connections and required equipment
Source L/R → separate INPUTs → XLR outputs → microphone inputs. THRU carries the parallel source signal for a suitable local destination.
Prepare the system
- Lower levels and protect the system before connecting.
- Label left/right and check source adapter wiring.
- Test each path alone, then the intended stereo mix.
Questions and troubleshooting
Playback loses one side or sounds incomplete.
Check the source breakout before blaming the DI.
- Verify separate left/right feeds to the two INPUTs; check source and console panning. A stereo headphone plug is not automatically a balanced mono feed.
- Test one known source/cable per path at protected level. If the fault follows a cable or output, document it; do not tie source outputs together to force mono.
The signal is quiet or distorted.
Locate the level mismatch.
- XLR outputs are mic level; check the destination preamp and source playback level. THRU is a different output type.
- For distortion, check console clipping first; then compare the DI pad with controlled gain readjustment. Verify clean peaks. Persistent distortion needs source/cable comparison and service evidence.
Hum remains after using ground lift.
The DI switch only changes the audio ground path.
- Compare its built-in GROUND LIFT at protected level and record the result. List attached audio, video and control equipment.
- If hum persists, have the system technician inspect the signal paths and approved isolation options. Never remove protective earth, cut shields or modify mains wiring.
Choose the next check
| Observation | Next check | What to record |
|---|---|---|
| Missing side | Breakout/L-R patch | Source and cable |
| Low/distorted | Mic input/pad/peaks | Settings and meters |
| Hum | Signal ground paths | Connections and comparison |
Precautions
- Do not connect speaker-power outputs without an explicitly approved interface.
- Keep protective earth intact.
- A ground lift is a diagnostic option, not a promise to eliminate every noise.
Manuals and documents for this equipment
Choose the document for the model, revision and language shown. Read it here or download the original PDF.
Official documentation
Diagnostic sequences are proposed checks, not physical tests by GLMedia. Match the installed version.
- Radial — ProD2 — Manufacturer source;consult the exact model/version.
- Radial — ProDI/ProD2 User Guide 02-2026 — Manufacturer source;consult the exact model/version.
- Radial — supplied 02-2025 guide — Manufacturer source;consult the exact model/version.
Related help
Laptop, mixer and PA: locate the noise
A DI can be part of the solution without identifying the cause of hum or distortion by itself.
Compare each stage
Use a known file and listen first at the source, then through a known console input/cable and finally the PA at controlled levels. Record where the issue appears and whether it follows source, channel or cable; do not change every variable together.
List adapter, interface, USB, video, charger and attached devices. If normal laptop battery operation changes the noise, record that condition without calling it a repair; reproduce the check with show power and connections. Keep protective earth intact and refer electrical faults to the competent responsible person.
Questions and decisions
What can we quote before the cause is known?
We can assess diagnosis, an interface or DI suited to actual signals, balanced wiring where applicable, approved audio isolation and prepared alternative playback. Separate verification from conditional replacement. Connector shape alone is insufficient, and removing protection is not a noise fix.
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