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RDL RU-ASX4DR 4x1 VCA Remote Controlled Stereo Audio Selector

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Please Note: requires PS-24AS Power Supply (sold separately)


The -TPS7A is a single-pair audio sending module compatible with RDL Format-A twisted pair products. The front panel features a single stereo mini-jack intended for stereo consumer line level audio sources. A studio-quality transformer provides isolation between the audio source and the RJ45 TP C... Read More

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The -TPS7A is a single-pair audio sending module compatible with RDL Format-A twisted pair products. The front panel features a single stereo mini-jack intended for stereo consumer line level audio sources. A studio-quality transformer provides isolation between the audio source and the RJ45 TP CABLE.

The -TPS7A is a single-pair sender, feeding the input signal to the cable pair set on the rear-panel switch during installation. This module drives only one cable pair, therefore a TP CABLE RJ45 jack is provided to accept signals and power from other mic level or line level Format-A senders. Two other single-pair senders may be chained to a TP CABLE jack, or a single two-pair sender may be connected. If three single-pair senders are connected together, each sender must feed a different pair: A, B or C. The -TPS7A must be set to feed pair A if it is connected together with an RDL two-pair sender that feeds stereo audio on pairs B and C.The -TPS7A is a passive module that does not require power to operate. If power is present on a cable connected to a TP CABLE jack, that power is passed through to the modules connected to the other TP CABLE jack.
  • Stereo Audio Input Combined to Mono Output
  • Input on Mini-jack
  • Switch Selects which RJ45 Pair (A, B or C) is Fed
  • Signal and Power Pair Pass-Through between TP CABLE RJ45 Jacks
  • Passive Circuitry Does Not Require Power
  • Galvanic Isolation through a Studio-Quality Transformer
  • Daisy-Chain with Single-Pair or Two-Pair Format-A Senders

Each of the four stereo line level inputs accepts either a balanced or an unbalanced signal. Each input is equipped with a rear panel screwdriver-adjustable input gain trimmer. Input signal levels between -15 dBV and +8 dBu may be set to the proper operating level as indicated by a stereo dual-LED VU meter. This assures ample headroom at all normal operating levels. The module is equipped with two identical dual-led VU meters, one on the front panel, the other on the rear panel. The maximum input level is +25 dBu.

The RU-ASX4DR was designed for absolute silent switching of audio signals using only solid-state switching circuitry. Each of the VU-meters, left and right, is calibrated to read +4 dBu feeding the corresponding balanced output.

The audio output level is controlled by a remote 10k ohm linear taper pot or by 0 to 10 Vdc. A single remote control location is possible using a remote 10k ohm potentiometer. The RU-ASX4DR is compatible with RDL D SERIES-RLC10 rotary remote controls that provide user adjustment at single or multiple locations. Audio levels are controlled in 0.5 dB steps using noiseless zero-crossing digital attenuators for optimum reliability, precise tracking and long-term click-free service. The output is stereo line level. Each output channel may be connected balanced or unbalanced.

Inputs are selected by a sequential remote control such as an RDL D-RCS4, by a momentary remote control such as an RDL D-RC4M or by an external open-collector momentary closure to ground. The RU-ASX4DR may be remote controlled from a single or from multiple locations. When a source is selected, the RU-ASX4DR provides a 25 mA open-collector output to control other equipment or modules. A front-panel LED indicates the selected source. Only one source may be selected at a time. If the momentary input terminal for a selected source is triggered again, all inputs are turned off.

Rear-panel DIP switches are provided to set the VCA activity LEDs for momentary or continuous display, to select the remote control mode (sequential or individual source selection), and upon power-up a return to either a pre-programmed source or to the last source used. The pre-programmed source is stored when the module is installed.

The RU-ASX4DR 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-ASX4DR operates from 24 Vdc connected through a rear-panel detachable terminal block.

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Product Specs

Audio Inputs (4)Stereo, Line level on Detachable Terminal Block
Input Impedance> 20 k balanced, > 10 k unbalanced
Input Level (for +4 dBu output)-15 dBV to +8 dBu, adjustable on rear-panel trimmers
Maximum Input Level+25 dBu
Common Mode Rejection> 60 dB (50 Hz to 120 Hz)
Headroom (above +4 dBu)> 18 dB (unity gain)
Frequency Response10 Hz to 20 kHz (±0.2 dB)
Distortion (THD + N)< 0.01% (20 Hz to 20 kHz)
Noise (below +4 dBu)< -85 dB (with any input selected); < -95 dB (with no input selected)
Off Attenuation> 85 dB (1 kHz), > 70 dB (20 kHz)
Crosstalk< -80 dB (1 kHz); < -60 dB (20 kHz)
Front-Panel Indicators (11)Power, Selected channel (4), VCA activity up/down (2), L and R Dual-LED VU meters (4)
Audio OutputStereo, Line level on Detachable Terminal Block
Output Impedance150 balanced, 75 unbalanced
Output Level+4 dBu balanced, unbalanced output 6 dB below balanced output level
Control inputs (6)1 mA, pulled to ground (4, source selection); 1 mA, pulled to +15 Vdc (SEL); 0 to 10 Vdc (VCA)
Control outputs (5)25 mA, open-collector to ground
VCA Control Input0 to 10 Vdc; or 0 to 10 k linear potentiometer
Rear-Panel Indicators (4)L and R Dual-LED VU meters
RDL Remote Control CompatibilityD-RC4M, D-RCS4 (source selection); D-RLC10, D-RLC10M, D-RLC10K, D-RLC10KM, D-RLC3 (VCA)
Power ConnectionDetachable Terminal Block
Power Requirement24 Vdc @ 175 mA, Ground-referenced
Ambient Operating Environment0° C to 55° C

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