Precision Audio and AV Interface Products

Radio Design Labs

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
  • Overview
  • Specifications
  • Related Products
  • Accessories
  • Downloads
  • How to Buy
  • Product Series
  • Dimensions

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

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.

Applications

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 dBu (rel. -10 dBV, unbalanced)
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)
Ambient Operating Environment:
0° C to 50° C
Power Requirement:
GROUND REFERENCED, 24 Vdc @ 82 mA (idle, nominal), 120 mA (max.)
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
Package Type:
Cardboard Box
Package Dimensions:
6 x 6 x 2.625 in.
Shipping Weight:
1.38 lbs.
WEEE weight:
1.13 lbs.
Tariff code:
8543.70.9860

Documents:
Format
PDF
CAD Files:
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High Res Images:
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Press Release:
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RACK-UP SERIES

RACK-UPs are the original 1/3 rack width 1RU rack-mountable modules for the A/V, recording and broadcast industries. Module functions include mixing, switching, pre-amplification, power amplification, distribution, gain control, equalization and more. Some RACK-UP modules are constructed in solid encapsulated durable industrial black plastic enclosures; MAX RACK-UPs are assembled using heavy duty extruded aluminum and steel panels. The rear panels feature clear bold white lettering for the terminal blocks and connectors. Reverse-printed front-panel polycarbonate laminates provide an attractive, durable finished appearance for rack-mounted or free-standing use.

Since RDL first originated 1/3 rack width modules, RACK-UPs have led the industry in economical, high-performance and cost-effective long life solutions in system designs. Multiple RACK-UP modules may be interconnected, or may be connected with other RDL modules to form all or part of an A/V system. Certain RACK-UP modules are often used free standing; all RACK-UPs may be rack mounted. A complete range of mounting options is available for systems comprised of multiple modules.

RACK-UP modules provide input, output and control connections through terminal blocks and connector (or both) according to common usage in professional installations. Front panels are equipped with connectors, user controls and LED metering, as appropriate.

Functions and features provided by RACK-UPs, since their introduction, are still available today. This continuity in product offering and support makes RACK-UP modules a preferred long-term resource for system design solutions. RACK-UP SERIES modules are designed and manufactured in the U.S.A.

RU-ADA4D RU-ADA4D