RDL AV-DC4 Specifications

AV-PAK™ Series

Model AV-DC4
Line-Level Audio Divider/Combiner

ANYWHERE YOU NEED...

 To Combine Audio Signals to a Single Output
 To Combine Stereo Line-Level Signals
 To Feed a Mono Signal to Stereo Inputs
 To Combine Multiple Lines to a Single Input
 Switch-Selectable Ground Isolation in Balanced Lines
 Line-Level Ground-Loop Elimination
 Balanced Mono Galvanic Isolation
 Signal Divider or Combiner in Rugged Field Case
 Portable or Permanent Module Mounting

You Need The AV-DC4!

The AV-PAK Series is a versatile product group from Radio
Design Labs. The heavy-duty metal design allows the
products to be used for both portable and fixed
installations. These products feature the dark RDL
ULTRASTYLE™ color complement making the modules
ideal for use on stage as well as in an office or meeting
room.

APPLICATION: The AV-DC4 is a mono transformer-coupled audio divider/combiner module for use with balanced,
low or high impedance audio inputs and outputs. Input and output connections are provided on XLR jacks with gold­plated contacts. The AV-DC4 features four identical channels. Each channel may be used as either an input or as an
output. Two XLR jacks are provided on each channel. The female jack is used if the channel is being used as an
input; the male jack is used if the channel is being used as an output. The shield (pin 1) connections of both XLR
jacks on a particular channel are normally connected to ground. The GND LIFT switch on each channel is used to
disconnect the shield from circuit ground at audio frequencies.

Galvanic isolation between each of the channels is provided by a studio quality audio transformer. The AV-DC4
breaks the “ground loop” connection that can produce hum in a sound system. The input connector shield does
provide a radio frequency ground return, thereby preserving system immunity to radio interference.

The four channels allow multiple uses for the AV-DC4. A single mono audio source can be divided to feed one, two or
three mono equipment inputs. A stereo source can be combined to mono, feeding one or two mono equipment inputs.
A mono source can be divided to feed a stereo equipment input (left and right). A stereo source can be combined to
mono and simultaneously be divided to feed the mono signal to both the left and right inputs of stereo equipment.
Ground lift may be selected individually on any of the channels.

The AV-DC4 is a rugged product designed for portable use. For fixed installations, a mounting bracket is included.
Wherever ground isolation and/or signal dividing or combining is required in balanced audio lines, the AV-DC4 is the
ideal choice. Use the AV-DC4 with other RDL modules and products to form a complete audio/video system.

RDL  659 N. 6th St.  Prescott, AZ., USA 86301  [phone]  FAX [phone] www.rdlnet.com

AV-PAK™ Series

Model AV-DC4

Installation/Operation

Line-Level Audio Divider/Combiner

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

FUNCTIONAL BLOCK DIAGRAM

rf Coupling

Ground Lift Ground Lift

SIGNAL SHIELD

CHANNEL A

APPLICATION EXAMPLES SHOWING THE USE OF EACH AV-DC4 CHANNEL INPUT OR OUTPUT JACK:

A single mono audio source feeding one, two or three mono equipment inputs:

Channel A: INPUT Channel B: OUTPUT Channel C: OUTPUT Channel D: OUTPUT

A stereo source combined to mono, feeding one or two mono equipment inputs:

Channel A: INPUT (L) Channel B: INPUT (R) Channel C: OUTPUT (mono) Channel D: OUTPUT (mono)

A mono source divided to feed a stereo equipment input (left and right):

Channel A: INPUT Channel B: OUTPUT (L) Channel C: OUTPUT (R) Channel D: Not used

A stereo source combined to mono and feeding the mono signal to both the left and right inputs of stereo equipment:

Channel A: INPUT (L) Channel B: INPUT (R) Channel C: OUTPUT (L) Channel D: OUTPUT (R)

For permanent installation, fasten brackets to surface and snap module into position:

rf Coupling

SHIELDSIGNAL SIGNAL SHIELD

CHANNEL B

rf Coupling

Ground Lift Ground Lift

CHANNEL C

rf Coupling

SHIELDSIGNAL

CHANNEL D

TYPICAL PERFORMANCE:

Input: +4 dBu nominal
Output: +4 dBu nominal
Frequency Response: 20 Hz to 20 kHz (+/- 0.05 dB)
THD+N: <0.5% (50 Hz to 20 kHz; two 150  sources, two 10 k loads); 0.02% @ 1 kHz
Insertion Loss: 1 dB nominal (one input, one output); 6 dB nominal (two inputs, two outputs)
Dimensions: Height: 1.75 in. 4.45 cm (unmounted)

Height: 1.95 in. 4.95 cm (mounted)
Width: 3.53 in. 8.97 cm
Length: 7.93 in. 20.14 cm

Finish: RDL Dark ULTRASTYLE™ (dark gray with beige lettering)

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-4030

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287