The Symetrix 308 VCA Volume Control/Loudness EQ is a half‑rack unit designed for professional installed sound systems that requires precise remote volume control and automatic loudness compensation. It provides two channels of voltage‑controlled amplifier (VCA)‑type level control, applicable for either a stereo signal in one zone or two mono zones. Additionally, the unit applies a loudness EQ contour at low volumes, boosting bass and treble while reducing midrange to improve perceived balance at reduced listening levels. Key Features: Two remote‑controlled channels with VCA gain control via 0‑10V control voltage or 10kΩ linear potentiometer. Loudness EQ contour automatically engages at lower volume levels, with up to ‑15dB midrange attenuation at 1kHz for perceived bass and treble boost. Balanced line‑level I/O (Euroblock connectors) with maximum input +20dBu balanced, output +22dBu balanced; wide bandwidth 20Hz ‑ 20kHz (+0/‑0.5dB). Flexible control interface: accepts remote potentiometers up to 500ft away, or DC control voltage, or remote control modules; supports both mono and stereo arrangements. Compact installation‑friendly format (1/2 rack width) requiring only a compatible power supply (Symetrix PS‑3 or PS‑3E) and minimal rack space.