RDL RUADA4D Data Sheet



RACK-UP

®

SERIES

Model RU-ADA4D

Audio Distribution Amplifier

 Stereo Audio Distribution with 4 Outputs
 Mono Audio Distribution with 8 Outputs
 Front-Panel Input Level Trimmers
 Dual-LED VU Meter for Each Input Channel
 Front-Panel Output Level Trimmers
 Inputs and Outputs on Rear Panel Detachable

Terminal Blocks

 Exceptional Audio Quality for the Most

Demanding Applications

The RU-ADA4D is part of the group of RACK-UP products from Radio Design Labs. RACK-UPs feature the advanced circuitry for which RDL products
are known, combined with accessible user-friendly controls and displays. The ultra compact design permits high-density installations, with three
products mounted in a single rack unit. Optional brackets permit mounting a RACK-UP module above, below, or in front of any flat surface.

APPLICATION:

adjustments and input level metering. The module may be operated in mono to provide up to eight distributed mono
signals. The inputs and outputs are connected on rear-panel detachable terminal blocks.

Each of the two line-level inputs accepts either a balanced or an unbalanced signal. Each input is equipped with a
front panel INPUT GAIN trimmer. Input signal levels between -14 dBV unbalanced and +9 dBu balanced may be set
to the proper operating level as indicated by a dual-LED VU meter. This assures ample headroom at all normal
operating levels. The maximum input level is +25 dBu.

A rear-panel switch selects between stereo and mono operation. In the mono position, input A (left) is used to drive all
8 output channels. When the module is used in a monaural system, only input A must be wired.

Audio outputs are isolated from each other and may be wired balanced or unbalanced. Each of the outputs is
provided with a front-panel screwdriver adjusted OUTPUT LEVEL control. Relative to a balanced +4 dBu output
level, this gain potentiometer allows an adjustment range from -9sdBstos+6sdB. Relative to an unbalanced

-10 dBV output, each output potentiometer allows an adjustment from -3 dB to +12 dB.

The RU-ADA4D offers exceptional headroom, very low distortion, excellent crosstalk isolation, wide flat frequency
response and extremely low noise with very high common-mode signal rejection. It provides exceptional audio
performance for the most critical applications in a professional audio environment.

The RU-ADA4D operates from 24 Vdc connected through a rear-panel detachable terminal block.

The RU-ADA4D is a four channel stereo audio distribution amplifier with input and output gain

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

www.rdlnet.com

RACK-UP® SERIES

Model RU-ADA4D

Audio Distribution Amplifier

Installation/Operation

Declaration of Conformity available from rdlnet.com.

Sole EMC specifications provided on product package.

Specifications are subject to change without notice.

TYPICAL PERFORMANCE

Inputs (2): Stereo (A/left and B/right) on detachable terminal block
Input Impedance: 20 kΩ balanced or 10 kΩ unbalanced
Input Level: +4 dBu balanced (nominal), +25 dBu maximum;

-10 dBV unbalanced
Input Gain Adjustments (2): -5 dB to +15 dB (rel. +4 dBu balanced); -3 dB to +17 dB
(rel. -10 dBV unbalanced)
Input Metering (2): Dual-LED VU Meter for Input A and Input B
Mono mode: Rear-panel switch-selectable (input A feeds all 8 outputs)
Outputs (8): Stereo, A (4), B (4) on detachable terminal blocks
Output Impedance: 150 Ω balanced; 75 Ω unbalanced
Output Level: +4 dBu balanced (nominal), +24 dBu maximum;

-10 dBV unbalanced
Output Level Adjustments (8): -9 dB to +6 dB (rel. +4 dBu, balanced);

-3 dB to + 12 dB (rel. -10 dBV, unbalanced)

Radio Design Labs Technical Support Centers

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

891-3425B

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

Frequency Response: 10 Hz to 165 kHz (+/- 0.25 dB);
10 Hz to 35 kHz (+/- 0.01 dB)
THD+N: < 0.0025% (20 Hz to 20 kHz)
Headroom: > 20 dB (above +4 dBu input or output)
Noise: < -92 dB (below +4 dBu output, 20 Hz to 20 kHz)
Crosstalk: < -90 dB (20 Hz to 5 kHz); <-80 dB (5 kHz to 20 kHz)
CMRR: > 90 dB (100 Hz)
Power Requirement: GROUND-REFERENCED,
24 Vdc @ 82 mA (idle, nominal), 120 mA (max.)
Ambient Operating Environment: 0° C to 50° C
Case Dimensions: 5.75” (14.6 cm) W x 1.65" (4.18 cm) H x 3.54” (9.0 cm) D;

3.9" (9.9 cm) D with connectors