User manual JBL J220

[. . . ] Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the product and to protect it from overheating, and these openings must not be blocked or covered. The openings should never be blocked by placing the product on a bed, sofa, rug or other similar surface. This product should not be placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturer's instructions have been adhered to. 9. The product should be situated away from heat sources such as radiators, heat registers, stoves or other products that produce heat. [. . . ] Do not overload wall outlets, extension cords or integral convenience receptacles, as this can result in a risk of fire or electric shock. 17. Never push objects of any kind into this product through openings, as they may touch dangerous voltage points or short-out parts that could result in a fire or electric shock. Never spill liquid of any kind on the product. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions: a. The power-supply cord or the plug has been damaged; or b. Objects have fallen onto, or liquid has been spilled into, the product; or c. The product has been exposed to rain or water; or d. The product does not operate normally when following the operating instructions. Adjust only those controls that are covered by the operating instructions, as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation; or e. The product has been dropped, or the enclosure damaged; or f. The product does not appear to operate normally or exhibits a marked change in performance. 1) If your receiver/amplifier has no subwoofer outputs or preamp outputs for the left, center and right channels. RECEIVER/AMPLIFIER SPKR In Left Right Phase 180 120 L R 0 90 60 150 180 Low Pass ­ + ­ + L R SPKR Out L L R Out Line Level R In ­ + ­ + LEFT SPEAKER RIGHT SPEAKER Power On Off PSW-D112 Digital Amplification ­3­ 2) If your receiver/amplifier has subwoofer outputs or preamp output jacks for the left and right channels. 3) If your receiver/amplifier has a single (mono) subwoofer output or LFE output, you may connect the output to either the Left or Right line-level input on the subwoofer. However, to maximize the subwoofer's performance, we recommend that you use a "Y"-connector (not included). Plug the single male end of the "Y"-connector into the subwoofer output on the receiver/ amplifier, and connect each of the 2 female connectors to an RCA-type interconnect cable. Then connect the 2 intercon- nect cables to the Left and Right line-level inputs on the PSW-D112. Note: If your receiver/processor contains Dolby* Digital or DTS® surround processing technology, then set the "Low-Pass" control on the 180Hz position. 120 120 90 60 150 180 90 60 150 180 High Pass High Pass SPKR In Phase 180 120 SPKR In 0 Phase 180 120 L R L 150 0 90 60 90 150 60 180 180 Low Pass RECEIVER/PREAMPLIFIER Subwoofer Output/LFE R L R SPKR Out Low Pass L R SPKR Out L L R Out Line Level RECEIVER/AMPLIFIER SUBWOOFER OUT LEFT RIGHT L L R Out Line Level R In R In MAIN SPEAKER OUTPUT RIGHT + ­ ­ + LEFT Power On On Power Off PSW-D112 Digital Amplification Off PSW-D112 Digital Amplification + ­ ­ + RIGHT LOUDSPEAKER LEFT LOUDSPEAKER ­4­ 4) If your receiver/amplifier has preamp output jacks and main input jacks for the left and right channels, or you have a separate preamp/ processor and power amplifier. This method of hookup can offer the highest level of performance for your complete loudspeaker system. The PSW-D112 incorporates a variable high-pass crossover in addition to a variable low- pass crossover. When hooked up as shown, the subwoofer will limit the low-frequency information that is returned to your receiver/amplifier. Your receiver/amplifier does not need to waste valuable power reproducing the low frequencies. In addition, since no low-frequency information is being sent to your main loudspeakers, they are able to reproduce mid and high frequencies with greater clarity. 120 90 60 150 180 High Pass SPKR In Phase 180 120 L R 0 90 60 150 180 Low Pass RECEIVER/AMPLIFIER L R SPKR Out L L R Out Line Level PRE OUT LEFT RIGHT MAIN IN R In MAIN SPEAKER OUTPUT RIGHT + ­ ­ + LEFT Power On Off PSW-D112 Digital Amplification + ­ ­ + RIGHT LOUDSPEAKER LEFT LOUDSPEAKER ­5­ Operation Power When the unit is plugged in and power is on and no signal is received, the LED on the front of the unit will turn red. When a signal is present, the LED will turn green. [. . . ] With this setting, your main speakers will not have the burden of reproducing any low-frequency sounds. · If you hooked up your subwoofer as shown in Hookup 1 on page 3, the high-pass frequency is fixed at 180Hz. · If you hooked up your subwoofer as shown in Hookup 2 or Hookup 3 on page 4, no high-pass control adjustments can be made from the subwoofer. Unless your receiver/ampli- fier incorporates a high-pass crossover, your main speakers will continue to get a full-range signal. [. . . ]