User manual JBL 905VX

[. . . ] The power cord of the product should be unplugged from the outlet when left unused for long periods of time. If an outside antenna or cable system is connected to the product, be sure the antenna or cable system is grounded so as to provide some protection against voltage surges and builtup static charges. Article 810 of the National Electrical Code, ANSI/NFPA 70, provides information with regard to proper grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna discharge unit, size of grounding conductors, location of antenna-discharge unit, connection to grounding electrodes, and requirements for the grounding electrode. For added protection for this product during a lightning storm, or when it is left unattended and unused for long periods of time, unplug it from the wall outlet and disconnect the antenna or cable system. [. . . ] Never spill liquid of any kind on the product. Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel. 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 damaged in any way; or f. The product exhibits a distinct change in performance ­ this indicates a need for service. If your receiver or amplifier does not have a line-level subwoofer output, then you do not need to make any other connections, and you should skip to the section titled "Amplifier Controls. " 4 LINE-LEVEL CONNECTIONS RECEIVER/AMPLIFIER SUBWOOFER OUT Y-Connector (not included) LEFT RIGHT LFE IN LFE IN LEFT 905VX RIGHT 905VX Each 905VX speaker is also equipped with a line-level Low-Frequency Effects (LFE/Subwoofer) input for superior performance with digital 5. 1 surround formats. The . 1 LFE channel contains additional low-frequency information not found in the left- and right-front channels. The LFE input works with the full-range speaker-level input to provide the dynamics and effects that your favorite filmmakers intended. You will need to use a Y-Connector (not included) with one male connector and two female connectors to connect the line-level subwoofer output on your receiver/amplifier to the LFE/Subwoofer inputs on the 905VX speakers. Plug the male connector into the subwoofer output on your receiver or amplifier, and connect each of the two female connectors to extension RCA patch cords. Then plug each patch cord into the LFE/Subwoofer input of the left and right 905VX speakers. Note: If your receiver has separate left and right line-level subwoofer (or LFE) output jacks, you do not need to use a Y-Connector. 5 AMPLIFIER CONTROLS LFE Level Control: Allows you to adjust the volume of the low-frequency effects/ subwoofer channel to suit your room acoustics or tastes. However, it only affects the LFE signal. If you are not using the LFE input, the LFE level control will not operate. Configuring Your Receiver: You should choose the "Large" or "Wide" option for the left- and right-front speakers so that full lowfrequency information will be sent to the 905VX speakers. Make sure that you also configure your receiver for "Subwoofer On" or "LFE On. " In this case, the LFE/Subwoofer signal will consist only of the . 1 (bass) channel. [. . . ] If you are using the 905VX LFE/Subwoofer input and the bass level decreases (instead of increasing) when you turn the LFE/ Subwoofer Level knob clockwise: · Recheck to make sure that your receiver or amplifier-speaker outputs are correctly connected to the 905VX speaker inputs (gold-plated binding posts), (+) to (+) and (­) to (­). The 905VX (+) terminal has a red stripe and is located on the right-hand side, below the letter "L" of the molded JBL logo, when looking directly at the back of the 905VX. · If the wires are connected properly, the confusion may be attributable to the design of your receiver/ amplifier. Your unit may have inverting inputs, which reverse the polarity of the signal between the inputs and outputs of the amplifier. [. . . ]