User manual JBL L150A

[. . . ] Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, or the apparatus has been exposed to rain or moisture, does not operate normally or has been dropped. Do not expose this apparatus to dripping or splashing and ensure that no objects filled with liquids, such as vases, are placed on the apparatus. To completely disconnect this apparatus from the AC Mains, disconnect the power supply cord plug from the AC receptacle. The mains plug of the power supply cord shall remain readily operable. [. . . ] Setting the subwoofer's volume level too high will result in an overpowering, boomy bass. Setting the volume level too low will negate the benefits of the subwoofer. Here are several additional facts on installation that may prove useful. It is generally believed that low frequencies (below 125Hz) are nondirectional and, therefore, placement of a subwoofer within any listening room is not critical. While in theory it is true that the larger wavelengths of extremely low frequencies are basically nondirectional, the fact is that, when installing a subwoofer within the limited confines of a room, reflections, standing waves and absorptions generated within the room will strongly influence the performance of any subwoofer system. As a result, specific location of the subwoofer becomes important, and we strongly recommend that you experiment with placement before choosing a final location. Placement will depend upon your room (for example, whether or not your room permits placement of the subwoofer near either satellite) and the amount and quality of bass required. 5 WALL - MOUNTING THE SATELLITES AND CENTER CHANNEL The L150A satellites and center channel are designed to be mounted on the wall. There is a fixed-mount wall bracket and an adjustable wall bracket provided for each satellite and the center channel. Each speaker bracket will require up to four 1-1/2" #10 wood screws; each screw should be fastened to a wall stud. If a wall stud is unavailable, install an anchor appropriate for a 1-1/2" #10 screw. NOTE: The customer is responsible for the correct selection and use of mounting hardware (available through hardware stores) that will ensure the proper and safe wall-mounting of the speakers. Connect the ­ (black) terminals in the same way. Do not reverse polarities (i. e. , + to ­, or ­ to +) when making connections. Doing so will cause poor imaging and diminished bass response. Be certain that positive and negative wire strands are completely isolated to avoid short circuits that may damage your equipment. Center Channel Observe polarities when making speaker connections, as shown in Figure 5. Connect each + terminal on the back of the amplifier or receiver to the respective + (red) terminal on the speaker. Connect the ­ (black) terminals in the same way. Do not reverse polarities (i. e. , + to ­, or ­ to +) when making connections. Be certain that positive and negative wire strands are completely isolated to avoid short circuits that may damage your equipment. NOTE: On certain models using hexagonal terminal nuts, a small socket wrench is provided to help in properly tightening the terminals. Hand-tighten only and do not overtighten. Figure 5. The satellites and center channel speaker feature terminals that can be connected in several different ways ­ e. g. , spade terminals and direct wiring (as shown here). [. . . ] Once you have confirmed that the subwoofer is active, proceed by playing a CD or DVD. Use a selection that has ample bass information. Set the overall volume control of the receiver/processor to a comfortable level. Adjust the Subwoofer-Level Control until you obtain a pleasing blend of bass. [. . . ]