The SOLUPEAK X301 is a passive XLR stereo source selector for audio setups that need to manage multiple balanced connections. It accepts three stereo XLR input pairs and provides one stereo XLR output pair, with a front-panel rotary control for choosing the active source.
Passive operation requires no external power, and the unit has no amplification or volume-control circuitry. Its signal path uses direct PCB traces without internal wiring. Balanced pin assignments are 1 for shield, 2 for positive, and 3 for negative. The aluminum case and knob accompany an FR4 PCB rear panel. External dimensions are 120 x 100 x 60 mm, with a package weight of 510 g.