[. . . ] Note: It will take several minutes for the LED to turn from blue to red after the input signal to the subwoofer is removed. [. . . ] Note: It will take several minutes for the LED to turn from blue to red after the input signal to the subwoofer is removed. Due to JBL's unique high-output, high-efficiency amplifier design, power consumption is minimal when the subwoofer is not receiving a signal. Of course, the subwoofer can be turned off with the main power switch, whenever desired, if you do not wish to leave it in auto (standby) mode. Then plug in a single separate RCA type interconnect cable (not supplied) into the Y cable. Finally, plug the other end of the single cable into your receiver's subwoofer jack. ". [. . . ] Then plug in a single separate RCA type interconnect cable (not supplied) into the Y cable. [. . . ]