RDL ST-ACR2 Line-Level Audio Controlled Relay, to 50 Seconds Delay

Bring reliable audio-driven control to your AV, security, and monitoring installations with the Radio Design Labs ST-ACR2 Audio Controlled Relay. Designed for commercial environments, this line-level relay senses incoming audio and closes contacts only when meaningful signal is present, making it ideal for surveillance triggers, paging systems, jukebox control, and other automated audio switching tasks. The ST-ACR2 lets you dial in sensitivity from -30 dBu to 0 dBu so you can ignore background noise, and its multiturn DELAY control provides a 5 to 50 second release time to prevent nuisance toggles during short audio gaps. With DPDT switching contacts, an open-collector SLAVE output and a 2A switching capacity, the module integrates cleanly with access control, monitoring equipment and broader control systems. Housed in a compact STICK-ON package for fast installation, the ST-ACR2 delivers dependable, repeatable operation in professional AV and security deployments. Add the ST-ACR2 to your next monitoring or surveillance project to automate audio-based switching—contact us to order or discuss integration options.

• Automatically activates line-level equipment when audio is present to streamline control in AV and security systems
• Adjustable sensitivity (-30 dBu to 0 dBu) for reliable triggering in noisy environments
• Configurable release delay (5 to 50 seconds) prevents chatter and false switching during brief signal drops
• DPDT contacts and open-collector SLAVE output for flexible integration with access control, monitoring, and automation
• Compact STICK-ON form factor enables quick, discreet installation in surveillance and paging applications