User manual JBL 502VXA

[. . . ] Do not defeat the safety purpose of the polarized plug. Powersupply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the product. Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. [. . . ] 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, or liquid has been spilled into the product; or c. The product has been exposed to rain or water; or d. If the product does not operate normally by 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. If 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. 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. Mode Off On Auto Procedure Turn volume knob fully counterclockwise. If the subwoofer is already off, turn volume knob clockwise. The subwoofer will turn off after approximately five minutes. The subwoofer will turn on when your receiver/amplifier begins playing again. LED Status Red Green Red Volume sub6 sub6 sub10 sub10 Crossover Frequency The crossover frequency knob determines the highest frequency your subwoofer will reproduce. It allows a seamless transition from the subwoofer to the satellite speakers. Experiment with this adjustment to find the crossover frequency that sounds best with your speakers. When using the speaker level connections, the crossover adjustment will also limit the low frequencies being sent to your satellite speakers. This means that your satellites won't have to try and reproduce the information the subwoofer is playing. Phase The phase switch is used to adjust the relative polarity of the subwoofer. Listen to your Control subwoofer and main speakers with the switch in the "+" position, then listen to the same material with the switch set to "­". Decide which sounds better and leave the switch in this position. [. . . ] · Review proper operation of your receiver/amplifier. If there is low bass output, check the following: · Make sure the connections to the left and right "Speaker Inputs" have the correct polarity (+ and ­). · Make sure that the subwoofer is plugged into an active electrical outlet. · Powered subwoofer is plugged in and is either in the "On" or "Auto" position. [. . . ]