Audiotek Subwoofer Volume Bass Control (Knob) AT-SC4<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>4 RCA's (left in， left out， right in， right out)</li><li>High grade construction built to last</li><li>Small compact design able to be installed anywhere</li></ul></div><img src="http://ecx.images-amazon.com/images/I/410zVpZiurL.jpg" noproxy>