User manual JBL PSW-D112

[. . . ] The product should be mounted on a wall or ceiling only when and as recommended by the manufacturer. 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. [. . . ] Do not use attachments not recommended by the product manufacturer, as they may cause hazards. When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or that have the same characteristics as the original part. Unauthorized substitutions may result in fire, electric shock or other hazards. Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition. Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous voltage or other hazards. All the safety and operating instructions should be read before the product is operated. The safety and operating instructions should be retained for future reference. All warnings on the product and in the operating instructions should be adhered to. The product should not be used near water ­ for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement or near a swimming pool, and the like. ­2­ Placement · As a general rule, bass response increases as a subwoofer is placed closer to a wall. Therefore, bass output is maximized when the subwoofer is placed in a corner. · It is also recommended that the subwoofer be positioned along the same wall as the front loudspeakers. Low-frequency sounds are normally omnidirectional, meaning the listener can't tell where they are generated from. However, frequencies between 75Hz ­ 150Hz can be localized, especially at higher volume levels. Positioning your subwoofer as recommended will provide the most natural soundstage and imaging from your loudspeaker system. Since every listening room is different, JBL strongly recommends experimenting with the positioning of your subwoofer to obtain the most pleasing results in your room. One technique that can help you find the ideal subwoofer location is to temporarily place the subwoofer near the main listening location. Then move around the room and determine where you hear the most pleasing bass performance. This would then be the ideal location for the subwoofer. 120 90 60 150 180 High Pass Hookup When we designed the PSW-D112 powered subwoofer, our goal was to offer the user the best possible performance combined with the most flexible and complete installation options. Please look over the following four examples to determine which description best matches your system and follow the corresponding hookup instructions. 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. [. . . ] · Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass. · Make sure that you have configured your receiver/ processor so that the subwoofer/LFE output is on. The Phase Control determines whether the subwoofer speaker's piston-like action moves in and out with the main speakers, 0°, or opposite the main speakers, 180°. Proper phase adjustment depends on several variables such as subwoofer placement and listener position. Adjust the phase switch to maximize bass output at the listening position. Remember, every system, room and listener is different. [. . . ]