RDL RACK-UP Series Manual

RACK-UP
®
Models RU-VCA2A & RU-VCA6A
Digitally Controlled Attenuators

Local or Remote Audio Level Control

Mono or Stereo Attenuation (RU-VCA2A)

Six Channel / Surround Attenuation (RU-VCA6A)

Noiseless Zero-Crossing Adjustment Steps

96 dB Attenuation Range in 0.5 dB Steps

Data Bus Provides Adjustment of Multiple Modules

Multiple Remote Control Locations Possible

Precise Level Tracking on Each Channel

Balanced or Unbalanced Line Inputs/Outputs

Adjustable Ramp Up/Down Rates

Controllable Using Various RDL Remote Controls

Selectable Level Control Options:
Pushbuttons (Internal or External)
Momentary Pulses (External/Rotary Encoder)
0 to10 Vdc or 10 k Potentiometer

Selectable Power-Up Return to PRESET or LAST Level

Selectable MASTER/SLAVE Mode for Control
Expansion
APPLICATION: The RU-VCA2A is a full-featured studio-quality dual-channel audio attenuator module for local and/or remote
control of balanced or unbalanced line-level sources. The RU-VCA6A has all the features of an RU-VCA2A with four additional
audio channels for level control of surround sound (5.1) or six individual analog audio channels. Each module can be remote
controlled from a single or multiple locations. Rear-panel terminals provide flexible control options using a variety of RDL remote
controls or OEM equipment.
Audio levels are controlled in
and long-term click-free service. Exceptional wide-band low-noise performance makes the RU-VCA2A and RU-VCA6A suited to
level adjustment in the most demanding applications. Rear-panel inputs and outputs may each be wired balanced or unbalanced.
The RU-VCA2A and RU-VCA6A power up in one of two operating modes set by a rear-panel switch.
MOM (momentary) Mode
In the MOM (momentary) mode, audio level is controlled by momentary pushbuttons or pulses. Remote terminals and front-panel
pushbuttons are provided for up and down ramping control. If either button is held in, the audio will ramp automatically. If a button
0.5
is pulsed (< second), the audio will increment one step. The time of both the UP and DOWN ramps is individually adjustable
on the front panel. Pushing remote UP and DOWN buttons simultaneously, or pressing the front-panel GO TO PRESET button,
returns the audio to a preset level. The preset level is stored by adjusting the desired level using the UP and DOWN buttons, then
pressing and holding the front-panel PRESET button for 3 seconds. A rear-panel switch sets the audio power-up level to either the
preset level or the last level setting used. Multiple remote control locations are possible in the MOM mode. External control pulses
may be either of positive polarity or pulled-to-ground (open-collector).
0 to 10 VDC Mode
In the 0 to 10 VDC mode the preset function is disabled and the audio level is controlled by a remote 10 k linear taper pot or by
0 to 10 Vdc. A single remote control location is possible using a remote 10 k pot.
In both operating modes, two separate 0 to 10 Vdc outputs are provided. The linear RAMP output drives the level display on RDL
remote controls; the EQ RAMP output is used to control an automatic RDL Loudness Equalizer (see ST-LEQ1). A front-panel
10-LED string display indicates the relative audio level. Control expansion is possible using the EXTERNAL CONTROL DATA
jacks. One module can be set as a MASTER module to control the level of one or more additional RU-VCA2A or RU-VCA6A
modules set to the SLAVE mode.
Use the RU-VCA2A and RU-VCA6A individually, or combine them with other RDL products as part of a complete system.
th
 
RDL 659 6 St. Prescott, AZ., USA 86301
SERIES
0.5
dB steps using noiseless zero-crossing digital attenuators for optimum reliability, precise tracking
 
(928) 443-9391 FAX (928) 443-9392

www.rdlnet.com