User manual JBL S4

[. . . ] Also take into consideration any unusual features of the room, such as an alcove, which may tend to create a localized node that may affect bass response in that area of the room. It is also recommended that the speaker be installed so that the bottom of the speaker is approximately 12" from the floor. Using the S4BB back box enclosure will ensure that the loudspeaker is installed at the ideal height. This is to help with the low-frequency loading (bass reinforcement). [. . . ] To use the push-type terminals on the S4 baffle, depress the colored cap until the pass-through hole in the binding post is revealed. While holding the cap down, insert the bare end of the wire, or a banana plug, into the passthrough hole. Release the cap and tug gently on the wire to ensure that it is secure. To use the binding-post speaker terminals on the terminal cup located on the top panel of the S4BB back box enclosure (sold separately), unscrew the colored knob until the pass-through hole in the center post is visible under the knob. Insert the bare end of the wire through this hole, then screw the knob down until the connection is tight. The hole in the center of each knob is intended for use with banana-type connectors. Since the S4 is a passive loudspeaker, only speaker-level connections are available. Use the S4 with a high-quality dedicated subwoofer amplifier as recommended by your JBL Synthesis custom installer, such as the JBL Synthesis S800. The amplifier should be capable of outputting up to 500 watts per channel with flat frequency response from 20Hz to 500Hz. Connect your main receiver or processor's line-level subwoofer output to the line-level input on your subwoofer amplifier. After you have installed the S4BB back box enclosure as described in the next section, connect the speaker terminals on your subwoofer amplifier to the speaker input terminals in the terminal cup located on the top panel of the back box, making sure to observe the correct polarity. They also help to isolate the speaker system from room resonances. 0 1 2 3 2 1 4 1 Detail A 3 1 2 2 1 3 5 5 6 INSTALLATION Installation: 1. Place the StyrofoamTM blocks on the bottom plate of the stud bay. The S4BB back box will rest on top of the blocks. Install the two centering bars as shown in Detail A on page 6. The centering bars are for setting the depth of the enclosure. They also help locate the horizontal position of the enclosure as they are mounted into the studs at the left and right to hold the enclosure in the correct location. The bottom of the S4BB back box will rest on top of the Styrofoam blocks 5 that you put on the baseboard two-by-four in Step 1. At this time, you may want to screw through each side of the wood centering bars to mount the enclosure to the studs. This will hold the enclosure in position. Install each of the ten bushings into their mounting holes 1. Insert one end of the rubber bushing into the hole, then place a flat washer on top of the bushing and screw the supplied 5" deck screw through the washer and into the bushing. [. . . ] · Check all wires and connections between the receiver/amplifier and the speakers. Make sure none of the speaker wires are frayed, cut, punctured or touching each other. · Review proper operation of your receiver/amplifier. · Check the Balance control and channel output level settings on your receiver/amplifier. [. . . ]