Sonifex RB-FS42 Audio Failover Switcher

The Sonifex RB-FS42 Audio Failover Switcher gives you peace of mind when it matters most. Built for reliability, it keeps your audio running even if your main source or destination fails. Whether in a broadcast setup or a professional audio network, this switcher ensures that the sound never drops out, so your audience always hears what they should.

Sonifex RB-FS42 Audio Failover Switcher Review

Behind its sleek 1U rackmount design, the Sonifex RB-FS42 Audio Failover Switcher carries powerful features that guarantee nonstop performance. With 4 main stereo paths and 2 standby inputs, it can quickly step in when a fault is detected, routing signals automatically to keep your broadcast or transmission alive. It works with both analog and digital audio as well as RS232 data, and thanks to its passive relay design, it maintains signal integrity even during a power loss. Add in dual redundant power supplies and simple web-based controls, and you’ve got a professional tool built for reliability in mission-critical environments.

Standard vs. DC Power Input Models

The Sonifex RB-FS42 comes in two versions to suit different installation needs. The standard RB-FS42 includes dual power options with a universal AC input (85–264V) and a 12V DC backup. This setup makes it ideal for studios or facilities that rely on standard mains power but still want the security of a backup supply.

The RB-FS42DC model, on the other hand, is designed for sites that depend on DC power systems. It accepts two separate 24–48V DC inputs, giving it the flexibility to run from battery banks or telecom-grade power supplies. Both models use the same passive relay design, so your audio signal will still pass through even if power is completely lost.

Sonifex RB-FS42 Audio Failover Switcher Features

• Keeps your audio running even if a source or destination fails
• Handles up to 4 main program feeds with 2 backup paths
• Works with both analog and digital audio connections
• Continues passing sound even during a power outage
• Easy-to-read front panel lights show system status
• Simple web interface for setup and monitoring

Sonifex RB-FS42 Audio Failover Switcher Specs

• 4 stereo main inputs and outputs plus 2 standby inputs
• Supports analog L/R audio, AES/EBU digital audio, and RS232 data
• Dual power options with AC input (85–264V) and DC backup at 12V 1A
• DC version available with two 24–48V DC inputs
• Dimensions 19 in W x 8.7 in D x 1.7 in H (1U rackmount)
• Weight 4.6 lb