The RU-ASX4D is a four channel stereo audio selector with input gain adjustments and output level metering. The inputs and outputs are connected on rear-panel detachable terminal blocks. 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-ASX4D was designed for absolute silent switching of audio signals using only solid-state switching circuitry. The output is stereo line level. Each output channel may be connected balanced or unbalanced. Each of the VU-meters, left and right, is calibrated to read +4 dBu for the corresponding balanced output. A front-panel LOCAL/REMOTE switch enables either the front-panel buttons or the rear-panel remote control terminals provided on detachable terminal blocks. In the LOCAL mode, four keyboard style long-life pushbuttons on the front panel are used to select one input. When a button is pushed, the corresponding audio input is fed to the output and any previously selected source is shut off. Only one source may be selected at a time. If the button for a selected source is pushed again, all inputs are turned off. An LED above each pushbutton indicates the selected source. In the REMOTE mode, 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-ASX4D may be remote controlled from a single or from multiple locations. When a source is selected, the RU-ASX4D provides a 25 mA open-collector output to control other equipment or modules. Rear-panel DIP switches are provided to permanently activate the remote control terminals, 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-ASX4D 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-ASX4D operates from 24 Vdc connected through a rear-panel detachable terminal block. Features: - Local or Remote Controlled Switching
- Multiple Switching Control Points
- 4 Stereo Inputs to 1 Stereo Output
- Line-Level Audio Switching
- Balanced or Unbalanced Inputs and Output
- Gain Trim on Each Source
- Controllable Using Various RDL Remote Controls
- Open-Collector Output for Selected Input
Specifications: | Audio Inputs (4): | Stereo, Line level on Detachable Terminal Block | | Input Impedance: | > 20 kO balanced, >10 kO unbalanced | | Input Level (for +4 d8u output): | -15 dBV to +8 dBu, adjustable on rear-panel trimmers | | Maximum Input Level: | +25dBu | | Common Mode Rejection: | > 60 dB (50 Hz to 120 Hz) | | Headroom (above +4 dBu): | > 20 dB (unity gain) | | Frequency Response: | 10 Hz to 20 kHz (±0.2 dB) | | Distortion (THD + N): | < 0.01% (20 Hz to 20 kHz) | | Piolse (belov. +4dBu): | < -85 dB (with any input selected); < -95 dB (with no input selected) | | Off Attenuation: | > 85 dB (1 kHz), > 70 dB (20 kHz) | | Crosstalk: | < -85 dB (1 kHz); < -65 dB (20 kHz) | | Front-Panel Switches: | Momentary pushbuttons (4, 1 per input), LOCAL/REMOTE latching pushbutton | | Front-Panel Indicators (11): | Power, Selected channel (4), LOCAL/REMOTE selector (2), L and R Dual-LED VU meters (4) | | Audio Output: | Stereo, Line level on Detachable Terminal Block | | Output Impedance: | 150 O balanced, 75 O unbalanced | | Output Level: | +4 dBu balanced, unbalanced output 6 dB below balanced output level | | Control inputs (5): | 1 mA, pulled to ground (4, source selection); 1 mA, pulled to +15 Vdc (SEL) | | Control outputs (5): | 25 mA, open-collector to ground | | Rear-Panel Indicators (4): | L and R Dual-LED VU meters | | RDL Remote Control Compatibility: | D-RC4M, D-RCS4 | | Power Connection: | Detachable Terminal Block | | Power Requirement: | 24 Vdc at 150 mA, Ground-referenced | | Ambient Operating Environment: | 0° C to 55° C | | WEEE Weight: | 1.26 lbs | | Shipping Weight: | 1.515 lbs | | 
