And with line-level and LFE inputs, adjustable crossover and phase controls and automatic turn on/off, the SUB150P is also simple to connect and set up. We're confident that this JBL subwoofer will provide every note of enjoyment that you expect ­ and that when you think about purchasing additional audio equipment for your home, car or office, you will once again choose JBL products. This quick-start guide contains all the information you need to set up, connect and adjust your new subwoofer. For more in-depth information, go to our Web site: www. Included Items 1X 1X 1X quIck-start guIde suBwooFer rear-Panel controls and connectIons Phase Switch Input Mode Switch Volume Control SUB150P Northridge, CA USA Designed and engineered in USA Made in P. C Crossover Control On/Standby LED Line-Level/LFE Input Connectors Power Switch 205323 Power Cord Connector Phase Switch: This switch determines whether the subwoofer transducer's piston-like action moves in and out in phase with the main speakers. If the subwoofer were to play out of phase with the main speakers, the sound waves from the main speakers could partially cancel out the sound waves from the subwoofer, reducing bass performance and sonic impact. This phenomenon depends in part on the placement of all the speakers relative to the listening position and to each other in the room. Input Mode Switch: When this switch is in the "Normal" setting, the input signal from both Line In connectors is routed through the subwoofer's built-in low-pass crossover network...