RDL ST-VCA3 Voltage Controlled Amplifier

Centralize smooth, reliable audio control for AV, security and surveillance installations with the Radio Design Labs ST-VCA3 Voltage Controlled Amplifier. Purpose-built as a pro amplifier module, the ST-VCA3 lets integrators remotely adjust amplifier or mic levels via a 0–10 V control output, wall-mounted potentiometer or control panel—eliminating scratchy audio and long-term potentiometer wear. The module provides line‑level attenuation plus a high‑quality microphone preamplifier, making it ideal for paging, monitoring and microphone jack applications. With a compact stick‑on design, 24 V DC power, LED metering and a wide 10 Hz–20 kHz frequency response, the ST-VCA3 delivers transparent audio performance and easy rack integration. Rated for 10 W RMS output and offering TwoWire or ThreeWire control options, it pairs cleanly with system controllers and AV security platforms. Backed by a 3‑year limited warranty, the ST-VCA3 is a practical solution for installers who need remote, tamper‑resistant audio control in professional monitoring, surveillance and commercial AV systems. Add the ST-VCA3 to your next project for dependable remote level control and better sound management.

• Remote, scratch‑free audio level control using 0–10 V or wall/panel potentiometers, protecting front‑end hardware and eliminating noisy pots
• Smooth, professional line‑level attenuation with on‑board mic preamp for flexible use with microphones or line sources
• Compact stick‑on form factor for rack installations—keeps audio inside the rack while extending level control to remote locations
• LED metering and selectable TwoWire/ThreeWire control for clear visual monitoring and simple integration with AV control systems
• Integrates with security, surveillance and monitoring systems for centralized audio management and consistent level control