OSD Audio SSVC-2 Dual Source Two Speaker Selector Switch with Volume Control

Used excellent condition.
Flexible switching and volume control for two pairs of speakers
OSD's SSVC2 has connections for two pairs of speakers, each with independent volume controls. Dual source inputs let you connect two amplifiers. Each amplifier can play through a single set of speakers, or you can have the same amp playing across all connected speakers. The built-in impedance matching circuitry is useful if you have a few speakers wired up that present too low of an impedance for your amplifier. It helps magnify the impedance to keep your amp from overheating or shutting down.

Highlights:
impedance-matching dual-source/dual-zone volume control
dual source inputs for connecting two separate amplifiers
front-panel A/B source buttons for zone source selection
outputs for two pairs of speakers, each with independent volume controls. handles up to 100 watts per channel (peak)
impedance-matching circuitry maintains stable load at the amplifier when multiple speakers are connected.