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Radial Engineering ProAV1 Passive Multimedia Direct Box

BH #RAPROAV1 • MFR #R800 1112
Radial Engineering
Radial Engineering ProAV1 Passive Multimedia Direct Box
Key Features
  • For Multimedia Applications
  • Mono 1/4", Stereo RCA, and 3.5mm Inputs
  • Mono XLR Line-Level Input
  • Mic-Level Mono Sum at XLR Out
The ProAV1 from Radial Engineering is a passive direct box designed for multimedia applications with the audio/video integrator in mind. The unit features a variety of mono and stereo inputs that are merged via a resistive mixer to mono, greatly simplifying signal management.
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Radial Engineering ProAV1 Overview

The ProAV1 from Radial Engineering is a passive direct box designed for multimedia applications with the audio/video integrator in mind. The unit features a variety of mono and stereo inputs that are merged via a resistive mixer to mono, greatly simplifying signal management.

To eliminate the need for various adapters, an array of connections are provided, including 1/4" for instruments, RCA and 3.5mm connectors for consumer electronics and computers, and a +4 dB XLR input for professional systems. The front-panel connectors can also be used as thru-puts to allow multiple patch points.

Custom wound transformers are able to withstand exceptionally hot levels while maintaining linearity from 20 Hz to 18.5 kHz. The resulting smooth Bessel curve is warm and natural, making the ProAV1 particularly adept at handling digital sources that can sound harsh. Transformer isolation adds the benefit of eliminating ground loops that cause audio hum and buzz and video hum.

The ProAV1 is ideal for events that interlace audio with video where audio sources can include smartphones, MP3 players, and video devices.

Professional direct box for multimedia applications
Ultraquiet passive design requires no external power source
Eliminates ground loops that can cause hum and buzz
Handles huge transients without distortion
UPC: 676101036530

Radial Engineering ProAV1 Specs

Input Connections1 x 1/4" TS
1 x 2RCA
1 x 1/8" / 3.5 mm TRS Mini
1 x XLR 3-Pin
Output Connectors1 x XLR
1 x 1/4" TS Thru-Put
1 2RCA Thru-Put
Input Level+18 dB a 20 Hz (Max)
Input Impedance140 Kilohms
Controls-15 dB Pad
Ground Lift Switch
Frequency Response20 Hz to 18.5 kHz, ±0.2 dB
THD0.01% (20 Hz to 20 kHz at -10 dB)
Phase Deviation1° at 100 Hz, 8° at 20 Hz
Common Mode Rejection Ratio+18 dB at 60 Hz
PowerPassive, no Power Required
Operating Temprature41 to 104°F / 5 to 40°C
Construction Material14 Gauge Steel Chassis and Shell
Dimensions5 x 3.25 x 1.9" / 12.7 x 8.25 x 4.8 cm
Weight1.6 lb / 730 g
Packaging Info
Package Weight1.85 lb
Box Dimensions (LxWxH)6.5 x 4.35 x 2.95"

Radial Engineering ProAV1 Reviews

Excellent product

By Victor
Rated 5 out of 5
Date: 2020-01-27

Excellent product with good price

Great Product

By Anonymous
Rated 5 out of 5
Date: 2014-07-27

A real Swiss Army Knife for audio. Had a big production doing video and needed to do a simple interface with exisiting live sound reinforcement. This all in one box did a great job. The problem that I usually face is ground loop but the Pin 1 lift on the box is easily able to eliminate the problem.

Excellent DI for multimedia

By John
Rated 5 out of 5
Date: 2013-06-30

I really like this DI. There is some discussion about whether you really need a DI for connecting small electronics to PAs and other equipment with balanced XLR inputs. Simply put...YES you do. Unbalanced line level signals can and will experience signal drop (especially if it's a stereo signal simply mated to XLR), feedback, and could even damage the PA it's connected to. This little wonder solves all of this. With a plethora of connections for consumer A/V products and 1/4 in for instruments, this truly is the Swiss Army Knife of DIs. Sound quality is good in the venues I've tried. So far I can tell you I haven't heard this add a lick of noise. Radial does make better quality options for professional users playing big venues on big systems. For my use however, (connecting laptops to PAs) presentations in panel rooms and convention halls, this is the perfect solution! It has an on board stereo to mono filter that isolates each channel and is isolated from the balanced side of the unit as well. It has a ground lift to prevent ground loops. Great care and thought has gone into this unit. It's all steel case makes is hefty but also near indestructible as well as providing an EM cage to prevent an noise from nearby electrical cabling from entering the internal components. Of course it's a passive DI so it will function on powered and unpowered mic lines alike. All-in-all, this is a versatile and reasonably priced solution to get your ipod or laptop to talk safely through professional audio installations.

Great Computer/Ipod Direct Box!

By Anonymous
Rated 5 out of 5
Date: 2011-03-23

This unit has exceptional sound quality for a very affordable price. It is rugged, reliable and easy to use. I have several of these and they are used regularly without any issues. You can never go wrong with Radial products.

Worth every penny.

By Hovik
Rated 5 out of 5
Date: 2019-01-28

Im a wedding videographer. I hook DJs mixers Stereo output to ProAV1 with two 1/4 cables. Then I connect my portable audio recorder to RCA THRU output. At the same time I connect my wireless mic transmitter to MIC output (with -15dB pad on this box ). So I have stereo audio in my portable recorder and a mixed left and right in my camera. Awesome. Id like to add Radial J-ISO or Pro-ISO between  the mixers output and ProAV1 for even better result. Actually ProAV1 can convert +4dB to -10dB like Pro-ISO but for one channel only.  Definitely a must have.

Can't tell you how, but this device solves some audio issues

By Chester
Rated 5 out of 5
Date: 2017-11-06

Needed to solve my dilemma of going output of my old laptop to my sportscasting gear and eliminating the overdriven audio. This gizmo did it. I'm not a techie, so I can't tell you why, and quite frankly I don't care. I just needed my problem solved. Unless a knowledgeable person can dumb down and post as to why this works for a particular audio situation, I'll get lost in a paragraph. If you've tried every patch cord/adapter configuration trying to get sound from A to B and can't get the audio to come through clean, read up on this device. It might help solve such an issue.

Great Audio Solution

By Isaac
Rated 4 out of 5
Date: 2016-08-02

Great Audio Solution

Swiss Army Knife of AV tools

By Stephen
Rated 5 out of 5
Date: 2016-01-20

I use this product to eliminate noise coming from a source such as a PC/laptop when I want to grab the audio from these sources. I already use another device to grab video; however, when I grab audio from PC/Laptop, horrible digital noise carries through. Using the Ground Lift option on this device eliminates the noise completely. Great selection of inputs. Wish it was in a different color! Oh well!

See any errors on this page? Let us know


Can I take phone calls using a rca to 3.5 mm out ...

Can I take phone calls using a rca to 3.5 mm out to phone?
Asked by: Solomon
By using this device with a smartphone, the caller could be sent to a mixer/ recorder directly. The caller could be recorded on a separate track of audio on a recorder. The caller would only hear you through the mic of the phone, as though you were on speaker phone. To make the call recording easier and have the caller here your mics audio, you may want to purchase this new Zoom podcasting recorder: B&H # ZOPTP4PCREC.
Answered by: Daniel
Date published: 2020-09-09


I have Yamaha MWC12 mixer and would like to record directly with a videa camcorder using beachtec DXA-2T. Can I use the RCA rec out or Dual TRS out to connect to this box and connect to DXA-2T via xlr cable and record stereo sound? Thanks.
Asked by: Anonymous
you would want the av2 for that
Answered by: Carmen H.
Date published: 2018-08-27


ProAV1 Can this unit output to a laptop's 1/8 microphone input for recording audio from a mixer?
Asked by: Stephen
Hello Stephen, Thank you for your interest in Radial. You will be better off to consider either the Radial Pro-ISO or J-ISO to convert a balanced line level signal from a mixer to a consumer level signal for the 1/8 input on your laptop.Regards,Ryan
Answered by: Radial Engineering Expert
Date published: 2018-08-28
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