Radial ProDI 1-Channel Passive Direct Box
An enthusiast single-channel passive DI from Radial using transformer isolation to send a hum-free signal from bass, acoustic, or keys into an interface. It's the practical fix for ground-loop noise and impedance matching when going direct. Being single-channel, stereo sources need the ProD2 instead — this is a focused, reliable utility box rather than a feature-laden product.
Scores
BreakdownHideOverall68±3Caliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions; excluded here: compatibility (no ecosystem dimension).
Scores
BreakdownHideCaliber-forward blend — tier caliber + within-tier price rank 30%, value 25%, confidence 20%, compatibility 15%, upgrade path 10% — renormalized over applicable dimensions; excluded here: compatibility (no ecosystem dimension).
The ± band on the overall score reflects sourcing confidence — wider when fewer specs are verified.
How each score is computed: our scoring methodology.
Specifications
| Spec | Value | Verification |
|---|---|---|
| accessory type | otherSourced | Sourced |
1/1 detail specs sourced. Amber rows are flagged for verification — we show them as reported, not confirmed.
Verdict
Best for
- Getting a hum-free, transformer-isolated DI from bass/acoustic/keys into the interface
Who should skip this
- Stereo sources (single channel; use the ProD2 for stereo)
Where to buy
List price $135
Prices are a guide and can change — confirm the current price on the retailer's site before buying.
Prices last checked Jul 16, 2026 — retailer prices change often, so click through for the current price.
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Compatibility
No platform-specific compatibility requirements — this works in any standard music production setup.
Upgrade path
Buying today, the Mogami Gold Studio XLR Microphone Cable (10 ft) scores higher for less — the smarter pick in accessories unless you specifically want this one. See it →