Radial Engineering 1115 User manual

INPUT PANEL

¼” INPUTS - left and right stereo

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input for instruments.

RCA INPUTS - left and right stereo

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inp ut for -10dB cons umer aud io
electronics.

3. 5mm TR S - inp ut co nne ction

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for stereo -10dB consumer audio
electronics.

-15dB PAD - reduces the input level

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by 15dB to prevent overload from
high output devices.

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LIFT - interrups the ground path
for the right channel only. Helps to
toubleshoot ground loops when using
the ProAV2 with an AC power device
like a keyboard.

OUTPUT PANEL

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LE FT & RIGHT XLR OU TP UT

- bal anced, 600 oh m, mic-l eve l
output is 100% transformer-isolated
and compatiable with mic snakes and
console preamps.

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GROUND - disconn ects pin-1 on
the XLR output connector to reduce
noise caused by ground loops.

CONSTRUCTION

BOOK-END DESIGN - 14 gauge

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ste e l out e r she l l pro v id e s a
protective zone for the switches and
connectors.

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FULL BOTTOM FOOT - neoprene
foam foot provides electrical isolation
and plenty of friction to stay put.

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I- BE AM DES IG N - inn er ste el
enclosure is reinforced with I-beam
profile. Eliminates stress that could
tor que the PC boa rd and cau se
solder joint failure.

MILITARY-GRADE - double-sided

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PCB is bolted to steel standoffs for
toughness.

RA DI AL TR AN SF ORMER - is

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pr ote cted from elect rom agnet ic
interfierence by a mu-metal can.

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ISOL ATED CONNECTORS - are
made from extremely tough glass­filled nylon for true electrical isolation
from chassis ground.

Radial Engineering

True to the Music

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2 3 5

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ProAV2 SPECIFICATIONS

ProAV2 Stereo Direct Box

Frequency response 20Hz to 20kHz +/- 2.5dB
Total harmonic distortion 0.01% THD 20Hz to 20kHz
Input Unbal. high-Z
Outputs Balanced 600-Ohm, mic-level, pin-2 hot
Input pad -15dB
Power requirement None, completely passive

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Size 3.25” x 5” x 1.875”
Weight 1.8 lbs.

RADIAL LIMITED THREE YEAR TRANSFERABLE

WARRANTY

Radial Engineering - a division of JP Cabletek Electronics Ltd. warrants this product
to be free from defects in material and workmanship and will remedy any such defects
free of charge according to the terms of this warranty. Radial Engineering will repair
or replace at its option any defective component(s) of this product, excluding the

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ProAV2 User Guide

finish, the bottom foam pad and wear and tear from normal use, for a period of three
(3) years from the original date of purchase. In the event that a particular product
is no longer available, Radial Engineering reserves the right to replace the product
with a similar product of equal or greater value. To make a request or claim under
this limited warranty, the product must be returned prepaid in the original shipping
container (or equivalent) to Radial Engineering or to an authorized repair centre and
you must assume the risk of loss or damage. A copy of the original invoice showing
date of purchase and the dealer name must accompany any request for work to
be performed under this limited warranty. This limited warranty shall not apply if
the product has been damaged due to abuse, misuse, misapplication, accident or
as a result of service or modification by any other than an authorized repair centre.

THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE
HEREOF AND DESCRIBED ABOVE. NO WARRANTIES, WHETHER EXPRESSED
OR IMPLIED, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, SHALL
EXTEND BEYOND THE RESPECTIVE WARRANTY PERIOD DESCRIBED ABOVE
OF THREE YEARS. RADIAL ENGINEERING SHALL NOT BE RESPONSIBLE OR
LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR
LOSS ARISING FROM THE USE OF THIS PRODUCT. THIS WARRANTY GIVES
YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS,
WHICH MAY VARY DEPENDING ON WHERE YOU LIVE.

Radial Engineering

ProAV2 User Guide

www.radialeng.com

Users Guide

Radial Engineering
1638 Kebet Way, Port Coquitlam BC V3C 5W9
Tel: [phone] Fax: [phone]
email: [e-mail]

Radial ProAV2 users guide V1.0 - Part #: R870 1145 00
Subject to change without notice

CONGRATULATIONS

on your purchase of the Radial ProAV2. Radial products are easy to use and this
short manual contains all the information you need to start using your ProAV2 right
away. For more information on the ProAV2, and other Radial products, visit our web­site, www.radialeng.com.

OVERVIEW

The Radial ProAV2 is a two channel (stereo) passive direct box. This innovative DI
features a ‘Swiss army knife’ compliment of connectivity options making it the perfect
DI for professional AV integrators and rental companies that regularly deal with a
variety of system interface problems.

The Radial ProAV2 is equipped with standard ¼” instrument inputs for each channel
making it easy to connect a stereo instrument or two mono ones. Stereo RCA and

3.5mm jacks make it easy to connect -10dB audio devices like MP3 and CD players
to a microphone snake and console preamp.

At the heart of the ProAV2 are two Radial transformers that perform level and imped­ance conversion while isolating noise caused by ground loops. Radial transformers
are manufactured for optimum signal transfer and minimal insertion loss, and are
exceptional for their low distortion, fl at frequency response and ability to handle high
input levels. The transformer is sheilded in a mu-metal can for protection against
noise caused by electromagnetic fi elds. It’s heavy-duty, two piece steel enclosure is
well suited for years of touring and rental use. The ProAV2 is completely passive and
does not require any power whatsoever to make it work. Enjoy!

CONNECTING THE ProAV2

Before connecting the ProAV2 make sure the sound system is turned off and all lev­els are set to zero. This will avoid any pops in the sound system that could damage
loudspeakers. Also confi rm that the GROUND, PAD and LIFT buttons are in their
“out” positions. Phantom power will not damage the ProAV2 if applied.

ProAV2 BLOCK DIAGRAM

Follow the block diagram from the inputs on the left to the output on the right. A really
cool feature shown in the diagram is all the hi-Z input jacks are paralleled together
in stereo. This makes any hi-Z jack a handy patch point. For example, a CD player
can be connected to the RCA jacks and the signal thru-put by the ¼” jacks to a sub­mixers line input. The 3.5mm jack could also be used to send the CD signal to a
computer sound card.

¼” JACKS - INSTRUMENTS
Guitar, bass and the output of effect pedals may be connected directly to the ¼” input
jacks. The signal may be thru-put to the players on-stage amplifi er by using the same
channel RCA jack and adaptor.

ProAV2 User Guide

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ProAV2 User Guide ProAV2 User Guide

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LIFT (RIGHT CHANNEL ONLY)

If the ProAV2 is used as two mono DIs a situation can arise where one source device
needs a ground path through the ProAV2 but the other source does not. This can
occure when one source is AC powered and the other is not. To accommodate this
the right channel is equipped with a separate ground lift switch labeled LIFT. Devices
powered throught the AC mains should be plugged into the right channel. When the
LIFT switch is depressed the right channel ground is interrupted between the input and
output while the left channel maintains a ground path through the ProAV2.

AC

Mains

AC

Mains

Break loop here with

LIFT switch.

The right channel LIFT feature can be used on devices that plug into AC mains power to reduce hum and buzz caused

by ground loops. The dashed line shows the ground loop formed between the AC mains and the signal cable ground.

When connecting stereo instruments, like synthesizers and drum machines, the two ¼”
jacks are used for the left and right channels. The stereo signal may be accessed at the
RCA or 3.5mm jacks and passed to sub-mixers, computer sound cards or on-stage ampli­fi ers.

RCA & 3.5mm JACKS

Consumer electronics with an unbalanced -10dB output, like CD and MP3 players, may
connect directly to the ProAV2 without cumbersome adaptors through the 3.5mm and
RCA inputs. The unbalanced inputs are paralleled together so any unused jacks may be
used to thru-put the signal to another device like a sub-mixer or recorder.

GROUND

To make grounding as fl exible as possible, the ProAV2 features a GROUND switch
and all connectors are isolated from the chassis to help eliminate noise caused by
ground loops. When the GROUND switch is in its “in” position, pin-1 on the XLR is
disconnected, interrupting the ground on both channels between the input and output.
Interrupting the ground can help in some situations to reduce noise caused by ground
loops.

XLR OUTPUT

Each ProAV2 channel outputs a balanced, 600 Ohm, mic-level signal that is compat­ible with microphone snakes and mixing console preamps. The output can drive long
cables without appreciably noise or signal loss.

OPTIONAL J-RAK

The optional J-RAK is a high density 2RU rack
shelf for Radial DI’s and splitters that allows up to
8 Radial devices to mount in one neat 19” package.
The DI’s can be mounted with either the input side
or output side facing the front. Ideal for studio or
touring. Constructed of 14 gauge steel with a baked
enamel fi nish.

OPTIONAL J-CLAMP

The optional J-CLAMP can mount a single Radial device to
virtually any surface. Perfect for hiding away inside racks, on
podiums or under tables. Constructed of 14 gauge steel with
a baked enamel fi nish

-15dB PAD

The ProAV2 is equipped with a -15dB input PAD to prevent overload distortion when inter­facing high output devices like CD players. The PAD reduces the input to the left and right
transformers and will not effect the level at the paralleled jacks.

TRANSFORMER ISOLATION

The Radial transformers convert the hi-Z input signals to a low-Z, mic-level signal. A major
benefi t of using transformers for signal conversion is the isolation the transformer provides
by preventing the fl ow of ground currents between the ProAV2s input and it’s output. This
transformer isolation effectively blocks hum and buzz caused by ground loops.

RCA Left & Right

3.5mm Thru

Stereo

Guitar

Bass

RCA Thru

Left ¼”

Right ¼”