Amazon.com: XtremPro 2 Way Speaker Switch, 1 in 2 Out Way Pair Stereo Speaker Selector W/Volume Control Metal Non-Slip Box - Black (61052), 9.0 x 3.25 x 1.5 : Electronics
2-Way Speaker Selector Switch | Control Boxes | Products - B-Tech International
2 Way Speaker Selector with Volume Control
4 Way Speaker Selector Switch Box Review and Uses, Cheap but Well Made. Stereo HiFi Audio - YouTube