RDL RU-ASX4D – 4x1 Stereo Balanced Audio Switcher, Terminal Block
RDL RU-ASX4D – 4x1 Stereo Balanced Audio Switcher, Terminal Block is backordered and will ship as soon as it is back in stock.
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RDL RU-ASX4D – 4x1 Stereo Balanced Audio Switcher, Terminal Block
What is the RDL RU-ASX4D?
The RDL RU-ASX4D is a four-input, one-output stereo line-level audio selector with silent solid-state switching. It accepts balanced or unbalanced sources on detachable terminal blocks, with gain trim on each input and dual-LED VU metering on the output. Sources can be selected from the front panel or from one or more RDL remote controls.
How does it work?
Each of the four stereo inputs has a rear-panel gain trimmer that sets input levels between -15 dBV and +8 dBu to the proper operating level, with a maximum input of +25 dBu. Switching uses only solid-state circuitry for silent transitions between sources. In LOCAL mode, four front-panel pushbuttons select one input at a time, and pressing the active button again turns all inputs off. In REMOTE mode, inputs are selected by a sequential remote such as the RDL D-RCS4, a momentary remote such as the RDL D-RC4M, or an external open-collector closure to ground. The RU-ASX4D can be controlled from a single location or several, and it provides a 25 mA open-collector output for the selected source to control other equipment. Rear-panel DIP switches set remote mode, permanently enable the remote terminals and choose whether power-up returns to a preset source or the last source used. The stereo output can be wired balanced or unbalanced, and two dual-LED VU meters, front and rear, are calibrated to +4 dBu. It operates from 24 Vdc at 150 mA through a detachable terminal block; RDL recommends the PS-24AS (USA) or PS-24AX (international) power supply, not included. Mount it with the RC-1UR 1RU rack chassis, RU-HRA1 10.4-inch rack mount or RU-SMA1 surface mounting plate.
What are the key features?
- Four stereo inputs to one output — Line-level sources are selected one at a time to a stereo output.
- Silent solid-state switching — Switching uses only solid-state circuitry to avoid audible clicks.
- Local or remote control — Select sources from the front panel or from RDL D-RCS4 and D-RC4M remotes.
- Input gain trim — Each input has a trimmer for levels from -15 dBV to +8 dBu.
- Status output — A 25 mA open-collector output for the selected source can control other equipment.
- Power-up recall — DIP switches select a preset source or the last source used at power-up.
Where is it typically used?
- Conference room
- Boardroom
- Training room
- House of worship
- Auditorium
- Multi-purpose room
Technical Specifications
| Audio inputs (4) | Stereo line level, detachable terminal block |
| Input impedance | > 20 kΩ balanced; > 10 kΩ unbalanced |
| Input level (for +4 dBu out) | -15 dBV to +8 dBu, rear-panel trimmers |
| Maximum input level | +25 dBu |
| Common mode rejection | > 60 dB (50 Hz to 120 Hz) |
| Headroom | > 20 dB above +4 dBu |
| Frequency response | 10 Hz to 20 kHz (±0.2 dB) |
| Off attenuation | > 85 dB (1 kHz); > 70 dB (20 kHz) |
| Audio output | Stereo line level, detachable terminal block; +4 dBu balanced |
| Output impedance | 150 Ω balanced; 75 Ω unbalanced |
| Control inputs (5) | 4 source selection (pulled to ground); 1 SEL (pulled to +15 Vdc) |
| Control outputs (5) | 25 mA open-collector to ground |
| Remote compatibility | RDL D-RC4M, D-RCS4 |
| Power requirement | 24 Vdc @ 150 mA, ground-referenced |
| Operating environment | 32°F to 131°F (0°C to 55°C) |
| Shipping weight | 1.515 lb |
Frequently Asked Questions
Can the RU-ASX4D be controlled from a wall plate?
Yes. It works with RDL remotes such as the RDL D-RC4M and RDL D-RCS4, or with external open-collector closures.
Can I use balanced and unbalanced sources together?
Yes. Each input and the output can be connected balanced or unbalanced.
Will switching cause pops?
RDL designed the RU-ASX4D for silent switching using only solid-state circuitry.
Can it trigger other equipment when a source is selected?
Yes. It provides a 25 mA open-collector output for the selected input.
What happens after a power failure?
Rear-panel DIP switches set power-up to return to a pre-programmed source or the last source used.
Is a power supply included?
No. It needs 24 Vdc at 150 mA; RDL recommends the PS-24AS (USA) or PS-24AX (international) power supply, not included.
What warranty applies?
This product is covered by a 7-year RDL warranty. For warranty claims, RMAs or support, contact Creation Networks at (888) 230-3661 or sales@creationnetworks.net.
At Creation Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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