User manual JBL JBL 6021 SERVICE MANUAL

[. . . ] This phenomenon depends in part on the placement of all the speakers relative to each other in the room. Power-On Mode Switch: When this switch is set in the "Auto" position and the Power Switch is set to "On, " the subwoofer will automatically turn itself on when it receives an audio signal and will enter the Standby mode when it has gone without receiving an audio signal for 20 minutes. When this switch is set in the "On" position, the subwoofer will remain on whether or not it is receiving an audio signal. Subwoofer Level Control: Use this control to adjust the subwoofer's volume. Turn the knob clockwise to increase the volume; turn the knob counterclockwise to decrease the volume. [. . . ] Line-Level In LFE Connector: This input bypasses the subwoofer's internal crossover circuitry, so use it only with a receiver or processor subwoofer output that has been low-pass filtered. If your receiver or processor does not have a dedicated subwoofer output that is lowpass filtered, use the subwoofer's Line-Level In L/R Connectors (see below) instead. Use the supplied mono RCA cable (purple connectors) to connect the Line-Level In LFE Connector to the dedicated subwoofer output of a receiver or preamp/processor. Line-Level In L/R Connectors: These inputs pass through the subwoofer's built-in crossover. Use them if your receiver or preamp/ processor does not have a dedicated subwoofer output that is lowpass filtered. Power Switch: Set this switch in the "On" position to turn the subwoofer on. The subwoofer will then be in On or Standby mode, depending on the setting of the Power-On Mode Switch. Power Cord: After you have made and verified all subwoofer and speaker connections described in this manual, plug the power cord into an active, unswitched electrical outlet for proper operation of the subwoofer. DO NOT plug this cord into the accessory outlets found on some audio components. 2 PLACING THE SPEAKERS FRONT LEFT AND RIGHT SPEAKERS TV Front Left Speaker Front Right Speaker Center Speaker CENTER SPEAKER 0 ­ 2 ft (0 ­ 61cm) TV Front Left Speaker Front Right Speaker SURROUND SPEAKERS AND SUBWOOFER TV Front Left Speaker Surround Right Speaker Surround Left Speaker Center Speaker Front Right Speaker Subwoofer 5 ­ 6 ft (1. 5m ­ 1. 8m) Surround Left Speaker Surround Right Speaker www. jbl. com 3 English SPEAKER MOUNTING OPTIONS SHELF-MOUNTING Satellites: 1. 3. Center: WALL-MOUNTING IMPORTANT SAFETY NOTE: The customer is solely responsible for proper selection and installation of mounting hardware not included with the speakers. JBL disclaims any liability for the selection and installation of mounting hardware. The Line-Level In LFE Connector bypasses the subwoofer's built-in crossover and the Crossover Control. SUBWOOFER ADJUSTMENTS: PHASE The Phase Switch determines whether the subwoofer driver's piston-like action moves in and out in phase with the satellite speakers. If the subwoofer were to play out of phase with the satellite speakers, the sound waves from the satellites could partially cancel out the waves from the subwoofer, reducing bass performance and sonic impact. This phenomenon depends in part on the placement of all the speakers relative to each other in the room. Although in most cases you should leave the Phase Switch in the "Normal" position, there is no absolutely correct setting for the Phase Switch. When the subwoofer is properly in phase with the satellite speakers, the sound will be clearer and have maximum impact, and percussive sounds like drums, piano and plucked strings will sound more lifelike. The best way to set the Phase Switch is to listen to music that you know well and to set the switch in the position that gives drums and other percussive sounds maximum impact. CROSSOVER The Crossover Control adjusts the subwoofer's built-in crossover between 50Hz and 200Hz. The higher you set the Crossover Control, the higher in frequency the subwoofer will operate 50 (Hz) 200 and the more its bass will "overlap" that of the satellite speakers. This adjustment helps achieve a smooth transition of bass frequencies between the subwoofer and the satellites for a variety of different rooms and subwoofer locations. To set the Crossover Control, listen for the smoothness of the bass. If the bass seems too strong at certain frequencies, try a lower Crossover Control setting. [. . . ] If the bass seems too strong at certain frequencies, try a lower Crossover Control setting. If the bass seems too weak at certain frequencies, try a higher Crossover Control setting. SUBWOOFER ADJUSTMENTS: VOLUME Use the Subwoofer Level Control to set the subwoofer's volume. Turn the knob clockwise to increase the subwoofer's volume; turn the knob counterclockwise to decrease the volume. [. . . ]