Radial Engineering ProAV2
Passive DI for AV, 2-Channels with RCA, 1/8" and XLR Inputs


A passive direct box providing full stereo functionality, Radial Engineering's ProAV2 is specifically developed with the AV integrator in mind, and features 2 discrete channels; a "must-have" problem solver that should probably be in every AV tech's tool kit.

A 'Swiss Army knife' array of connections are provided, including 1/4" for instruments, RCA and 1/8" connectors for consumer electronics and computers, all eliminating the need for various adapters. Connectors on the front panel can also be used as thru-puts to enable multiple patch points.

Eclipse ET-DB2 custom-wound transformers are employed, and are able to stand up to exceptionally hot signal levels, while still retaining linearity from 20 Hz on up to 18.5 kHz. The resulting smooth Bessel curve brings warm and natural characteristics, making the ProAV2 particularly adept at handling digital sources that can sound harsh. Its transformer isolation adds the benefit of eliminating ground loops that cause audio hum and buzz as well as video hum bars or snow.

Radial Engineering ProAV2 Key Features:

  • Pro 'Swiss Army knife' direct box for multi-media
  • Easy to use passive ultra-quiet design
  • Eliminates ground loops causing hum and buzz
  • Handles huge transients without distortion

Radial Engineering ProAV2 Specifications:

  • Audio circuit type: Passive, transformer based
  • Number of channels: 2-channel (stereo)
  • Frequency response: 20 Hz ~ 18.5 kHz (± 0.2 dB) 
  • Dynamic range: 128 dB
  • Maximum input: +18 dB @ 20 Hz
  • Total harmonic distortion: 0.01% from 20 Hz ~ 20 kHz @ -10dB
  • Phase deviation: 1° @ 100 Hz; 8° @ 20 Hz
  • CMR ratio: n/a
  • Input impedance: 140 kOhms, unbalanced
  • Output impedance: 150 Ohms, balanced   
  • Transformer: Eclipse ET-DB2, 12:1 ratio
  • Shield: Faraday, MuMETAL® can
  • Input Pad: 15 dB 
  • 180° Polarity Reverse: Inverts absolute phase
  • Ground Lift: Disconnects pin-1 at XLR output
  • XLR configuration: AES standard (pin-2 hot)
  • Connectors: ¼", RCA,  3.5mm, in & thru, XLR-M out
  • Power: Passive, no power required
  • Warranty: Radial 3-year, transferable


  • Construction: 14-gauge steel chassis & shell
  • Finish: Durable powder coat
  • Size (W x H x D): 3.25" x 5" x 1.875"
  • Weight: 1.8 lbs. (0.82 kg)
  • Shipping Size (W x H x D): 4.00" x 3.00" x  6.50" (102 x 76 x 165mm)
  • Shipping Weight: 2.60 lbs. (1.2 kg)
  • Environmental Conditions: For use in dry locations only between 41° F and 104° F (5° C - 40° C)
  • WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

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