Radial ProD2 Passive Stereo Direct Box - Reliable Stereo DI

In this review the Radial ProD2 is presented as a compact, workhorse stereo DI aimed at keyboardists and engineers who need a straightforward way to feed a PA while keeping a stage amp connected. The single biggest reason to buy is its simple, passive design built around high-performance Eclipse transformers that deliver linear response and high headroom without coloration, providing a dependable stereo XLR feed for live and studio use. The reviewer found it particularly useful where isolation and low distortion are priorities.

Key Features

• Passive stereo design: Provides two independent channels so a stereo keyboard can feed the PA and a stage amp simultaneously without extra routing complexity.
• Eclipse ET-DB2 transformers: Deliver a wide frequency response and high headroom so the signal remains clear and stable even at hot levels.
• Linear 20Hz-18kHz response: Ensures faithful reproduction of low bass and detailed highs for keyboards and stereo rigs.
• Isolation between outputs: Two fully isolated outputs reduce hum and ground loop issues when connecting to a house console.
• 15dB pad and lift switch: Gives practical control over level and ground lift to tame hot signals and eliminate ground hum on complex setups.

Who It's For

The Radial ProD2 is best for keyboard players, electronic musicians and live sound engineers who need a compact, passive stereo DI that reliably feeds a PA while preserving tone and dynamics. Its transformer-based design suits situations with unpredictable signal levels and where a natural saturation characteristic from transformers is acceptable or desirable.

Musicians who require active features such as onboard EQ, battery power or instrument-specific preamps should look elsewhere; likewise, anyone needing ultra-extended HF beyond the specified linear range or integrated digital features will find the ProD2 intentionally simple.

Pros & Cons

Pros

• Robust build quality and professional connectors for reliable stage use.
• Excellent sound quality with low distortion and near-zero phase distortion across its linear range.
• Isolation transformer outputs and ground lift help eliminate hum and interaction with house systems.

Cons

• Passive design means no active gain or battery power, so very low output sources may require more input gain at the console.

Specifications

Product type	Passive stereo direct box
Channels	2 independent channels
Transformers	Eclipse ET-DB2 high-performance transformers
Frequency response	Linear from 20Hz to 18kHz (20Hz-20kHz performance noted)
Controls	15dB pad and ground lift switch
Outputs	Two fully isolated XLR outputs for PA

Our Verdict

The Radial ProD2 is a sensible, well-built passive stereo DI that excels at delivering a clean, isolated stereo feed for keyboards and stereo sources. It offers durable construction, faithful sound and practical isolation controls, making it a good value for players and engineers who need a reliable transformer-based DI without active extras.

Frequently Asked Questions

Can the ProD2 handle hot signals?
The Eclipse transformers and 15dB pad allow it to tolerate high levels without audible distortion and give a safety margin for hot outputs.

Does it require power?
No, the ProD2 is passive and does not need batteries or phantom power to operate.

Will it eliminate ground hum?
The ground lift and isolated outputs help reduce ground loops in many setups, though system wiring also affects results.