Radial Engineering ProAV1 – Passive Multimedia Direct Box

The Radial ProAV1 is a versatile direct box built for AV integrators, venues, and content creators who need to connect consumer and professional gear with minimal fuss. With multiple input types, transformer isolation, and excellent signal integrity, it delivers clean, reliable audio—available at Soundium.

Key Features

• Multiple input options: Accepts ¼-inch, RCA, 3.5 mm stereo, and line-level XLR inputs—letting you connect instruments, phones, mixers, and player devices without adapters
• Stereo-to-mono summing: Stereo sources are summed into a single mono balanced XLR output—ideal for simplifying mix setups or combining left/right from consumer gear
• Transformer-based passive circuit: Eclipse ET-DB2 transformer gives high headroom, low distortion, and isolates from ground-loop noise
• −15 dB pad & ground lift: Helps tame hot input sources and remove hum or buzz from ground loops
• Thru connectors: ¼-inch and RCA thru-puts allow you to daisy-chain or feed additional gear without extra splitting gear
• Rugged build: Steel chassis designed for road use, reliable connectors, and passive design means no power needed, fewer failure points

Customer Benefits

ProAV1 makes your life easier when integrating consumer and line-level gear into professional systems. You get clean audio without buzz, the flexibility to plug in varied sources without adapters, and a direct output that works with pro mixers or PA systems. With pad and ground-lift options, you adapt instantly to hot signals or grounding issues—available at Soundium.

Quick Specs

• Audio circuit type: Passive, transformer-based
• Transformer ratio: 12:1 Eclipse ET-DB2
• Channels: Single channel (mono output)
• Frequency response: 20 Hz – 18.5 kHz (± 0.2 dB)
• Dynamic range: 128 dB
• Total harmonic distortion: 0.01 % from 20 Hz to 20 kHz at -10 dB
• Input impedance: 140 kΩ (unbalanced)
• Output impedance: 150 Ω (balanced)
• Common-mode rejection ratio: 100 dB at 60 Hz
• Maximum input: +18 dB at 20 Hz
• Pad: -15 dB
• Dimensions (W × D × H): 12.7 × 8.25 × 4.8 cm
• Weight: 0.73 kg

What’s in the Box

• Radial ProAV1 direct box unit
• Documentation (manual, safety guide)

Use Cases / Ideal For

Perfect for integrating consumer audio sources (like phones, laptops, tablets) into live sound or PA systems, connecting line-level outputs from mixers, interfacing instruments, streaming or AV presentation setups, and any situation where hiss, ground hum or channel clutter is a problem.

Compatibility

Compatible with any mixer, audio interface or PA system that accepts balanced XLR input. Works with unbalanced sources via RCA, ¼-inch or 3.5 mm. No power required (passive). Operates reliably between 5 °C and 40 °C in dry environments.

Pros & Cons

✅ Pros:

• Handles digital sources cleanly while eliminating ground loop hum
• Many input types in one unit, reducing need for adapters and simplifying setups
• High dynamic range and low distortion even at loud transients
• Pad and ground-lift make it adaptable to many signal levels and situations
• Passive design means no power required

⚠️ Cons:

• Mono output only—stereo sources are summed to mono
• Pad and ground-lift controls are manual (no remote or automated control)
• Passive circuits may lose a little high frequency detail with long cable runs compared to active DIs in some setups

The Radial Engineering ProAV1 stands as a robust, no-compromise DI box for any multimedia-centric setup. If you need to connect varied consumer and pro gear cleanly, without noise or hassle, this is a toolbox essential—available at Soundium.