RDL RU-ADA4D - Audio Distribution Amplifier
- 4 Channels of Stereo Audio Distribution
- 8 Channels of Mono Audio Distribution
- Front-Panel Input Level Trim Controls
- Dual-LED VU Meters for Both Inputs
- Detachable Terminal Block Connections
- Input Peak LEDs
The RU-ADA4D from RDL 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 trim level. 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 is used to drive all 8 output channels. When the module is used in a monaural system, only input A must be wired.
Audio outputs are isolated from each other and may be wired balanced or unbalanced. Each of the outputs is provided with a front panel screwdriver adjusted Output Level control. Relative to a balanced +4 dBu output level, this gain potentiometer allows an adjustment range from -9 dB to +6 dB. Relative to an unbalanced -10 dBV output, each output potentiometer allows an adjustment from -3 dB to +12 dB.
The RU-ADA4D offers generous headroom, low distortion, crosstalk isolation, wide frequency response and low noise with high common-mode signal rejection. It provides quality performance for professional audio applications.
| Audio Input | |
|---|---|
| Inputs | Stereo input (input A /input B) on detachable terminal block |
| Input Impedance | 20k? balanced 10k? unbalanced |
| Input Gain | -5 dB to +15 dB (rel. +4 dBu balanced) -3 dB to +17 dB (rel. -10 dBV unbalanced) |
| Input Metering | Dual-LED VU meter for Input A and Input B |
| Audio Output | |
|---|---|
| Mono Output | Rear-panel switchable (input A feeds all 8 outputs) |
| Outputs | 4 x stereo (input A /input B) outputs on detachable terminal blocks |
| Output Impedance | 150? balanced 75? unbalanced |
| Nominal Output Level | +4 dBu balanced -10 dBV unbalanced |
| Maximum Output Level | +24 dBu maximum |
| Output Level Adjustment Range | -9 dB to +6 dB (rel. +4 dBu, balanced) -3 dB to + 12 dBu (rel. -10 dBV, unbalanced) |
| Performance | |
|---|---|
| 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) |
| General | |
|---|---|
| Power Requirement | 24 VDC @ 82 mA (idle, nominal), 120 mA max Ground referenced |
| Operating Temperature Range | 32 to 122°F (0 to 50°C) |
| Dimensions (W x H x D) | 5.74 x 1.64 x 3.54" (14.58 x 4.17 x 9 cm) |
| Weight | Not specified by manufacturer |
| Packaging Info | |
|---|---|
| Package Weight | 1.4 lb |
| Box Dimensions (LxWxH) | 6.8 x 6.2 x 2.8" |
- Limited 3-Year Warranty
