User manual JBL S412P II

[. . . ] 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. [. . . ] We're confident that the JBL loudspeakers you have chosen will provide every note of enjoyment that you expected ­ and that when you think about purchasing additional audio equipment for your home, car or office, you will once again choose JBL. It enables us to keep you posted on our latest advancements, and helps us to better understand our customers and build products that meet their needs and expectations. JBL Consumer Products SPEAKER PLACEMENT Proper placement of the speakers is an important step in obtaining the most realistic soundstage possible. These recommendations are for the optimal placement of the loudspeakers. The S412PII loudspeakers are video-shielded and can safely be placed near a television. The S412PII speaker features four rubber feet that enable it to be placed on a smoothsurfaced floor, such as tile or hardwood. Four metal spikes are supplied for use when the speaker is to be placed on a carpeted surface to decouple the speaker from the floor and prevent unwanted damping. To insert the spikes, gently lay the speaker on its side (not its front or back) on a soft, nonabrasive surface. Each spike screws into the threaded insert in the center of each rubber foot. NEVER drag the speaker to move it, as this will damage the spikes, the feet and/or the wood cabinet itself. Always lift the speaker and carry it to its new location. CAUTION: Floorstanding (tower) loudspeakers have a high center of gravity and may become unstable and tip over during earthquakes or if rocked, tipped or improperly positioned. If this is a concern, these speakers should be anchored to the wall behind them, using the same procedures and hardware customary for anchoring bookcases and wall units. Customer is responsible for proper installation and proper selection of hardware. 3 SPEAKER CONNECTIONS CONNECTION TIPS amplifier. Wiring "out of phase" results in thin sound, weak bass and a poor stereo image. With the advent of multichannel surround sound systems, connecting all of the speakers in your system with the correct polarity remains equally important in order to preserve the proper ambience and directionality of the program material. To use the binding-post speaker terminals, unscrew the collar until the passthrough hole in the center post is visible under the collar. Insert the bare end of the wire through this hole; then screw the collar down until the connection is tight. The hole in the center of each collar is intended for use with banana-type connectors. Speakers and electronics terminals have corresponding (+) and (­) terminals. It is important to connect both speakers identically: (+) on the speaker to (+) on the amplifier and (­) on the speaker to (­) on the SPEAKER-LEVEL CONNECTIONS RIGHT LEFT ­ + ­ + ­+ ­ + Receiver's Speaker Outputs 4 Your S412PII speakers should be connected to your receiver in two ways (at speaker level and line level) in order to achieve the best performance, especially when listening to program material recorded in digital formats, such as Dolby* Digital and DTS. ® Connect the left-front and right-front speaker terminals on your receiver or amplifier to the 5-way binding posts on the back of each S412PII speaker. Remember to maintain the correct polarities ("+" to "+" and "­" to "­"). The S412PII uses a red binding post for "+" and black for "­". These connections will provide full-range sound to all four transducers, and you should ALWAYS make these connections. 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. " LINE-LEVEL CONNECTIONS RECEIVER/AMPLIFIER SUBWOOFER OUT Y-Connector (not included) LEFT RIGHT LFE IN LFE IN LEFT S412PII Each S412PII speaker is also equipped with a line-level Low-Frequency Effects (LFE/Subwoofer) input for superior performance with digital surround formats. The . 1 LFE channel contains additional low-frequency information not found in the left- and right-front channels. This configuration is generally unnecessary but, in certain room-placement conditions, it allows greater bass-level control. [. . . ] · 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. To check if this is the case, reverse the speaker connections for ALL S412PII's in your system (and disconnect any other speakers in the system) so that the receiver/amplifier's (+) connector is connected to each S412PII's (­) (black stripe) speaker connector. If you do this and the S412PII's function properly (bass increases as you turn your LFE/Subwoofer levelcontrol knobs clockwise), your receiver/amp uses inverting inputs. [. . . ]