Radio Design Labs RUDA4D
Audio Distribution Amplifier

RUDA4D

The RU-DA4D 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! Single RACK-UPs can be mounted right where they are needed using the adhesive method popularized by RDLs STICK-ON series of products. Optional brackets permit mounting a RACK-UP module above, below, or in front of any flat surface!

APPLICATION: The RU-DA4D is the ideal choice in applications where line level signals need to be distributed. All connections are made using full-size barrier block terminals on the rear panel.

The RU-DA4D has two separate line level inputs. Each input permits the connection of either balanced or unbalanced, high or low impedance audio lines.

When a stereo source is used, each channel is connected to an individual input. In this configuration, the RU-DA4D provides four isolated outputs from each of the two (left and right) inputs. When a monaural source is used, a total of eight outputs can be fed simultaneously. A jumper may be placed between the two rear-panel terminals which feed the audio source signal connected to the channel A input, to all of the channel B outputs, as well as to the normal channel A outputs.

Each of the outputs is provided with a front-panel screwdriver gain control. Relative to the input level, this gain potentiometer allows an adjustment ranging from -15 dB to +18 dB gain. Each of the outputs drive balanced audio lines, and may be unbalanced if required. A convenient write-on label area is provided to identify the feed controlled by each output level control.

Audio `presence' is indicated by an LED indicator. An indicator is provided for each channel. Whenever an audio signal is present for the given channel input, the indicator lights.

Specifications:

• Inputs (2): Line-Level
• Input Impedance: 10 kohm Balanced or Unbalanced
• Gain: Each Output Adjustable -15 dB to +18 dB
• Frequency Response:
      * 20 Hz - 20 kHz (+/- 0.5 dB) into 600 ohm
      * 10 Hz - 20 kHz (+/- 0.5 dB) into 10 kohm
• THD: less than 0.010%
• Headroom: greater than 18 dB above +4 dBu (Input or Output)
• Noise: less than -85 dB below +4 dBu Output
• Crosstalk: less than -70 dB
• CMRR: greater than 50 dB @ 100 Hz
• Indicators (2): 1 LED Per Channel for Audio Present (Audio Input greater than -20 dBu)
• Power Requirement: 24 to 33 Vdc @ 120 mA, Ground-referenced

Our Part #  RUDA4D