User manual JBL GTQ100

[. . . ] If the GTQ amplifier is installed by an authorized JBL dealer in the USA, we will double the length of your warranty to two years from date of purchase. Please retain a copy of your bill of sale to ensure this additional coverage. If you choose to install the GTQ amplifier yourself, read all of the information in this manual before you start the installation. It will save potential problems later if you take a few minutes to plan the complete installation before you start. [. . . ] Make sure that the positive (+) speaker terminal is attached to the positive (+) amplifier connection in every speaker-toamp connection. All two-conductor speaker wire has one conductor marked in some way so it can be easily traced. · Stereo Connection ­ Connect each speaker to appropriately labeled terminals of the speaker output connector. · Bridged-Mode Connection ­ Connect the loudspeaker positive (+) terminal to the RIGHT positive amplifier speaker output terminal on the group to be bridged. Connect the loudspeaker negative (­) terminal to the LEFT negative amplifier speaker output terminal on the group to be bridged. The appropriate group mode switch should be set to LEFT or L+R. 08 GTQ 190 - English 06/03/98 11:49 Side 9 )­( )+( GR1 L LINE LEVEL INPUT GR2 PREAMP OUTPUTS GR1 GR2 SPEAKER LEVEL INPUTS R GR2 L +­ ­+ GR2 + R SPEAKER OUTPUTS BRIDGE ­ +L ­ FUSE 30A POWER R +­ ­+ R GR1 L GR1 + R ­ + L ­ BATT(+) REMOTE BRIDGE GND Audio Input Connections Line-Level Input Connections · Proper wiring between the signal source, any other components in the system, and the GTQ amplifier will help keep noise levels in the system low. Use high-quality, twisted-pair cable or lowcapacitance shielded wire. )+( )­( )+( )­( Simultaneous Stereo-Mono Connection Diagrams 09 Owner's Manual · Simultaneous Stereo + Mono Connection­ Each of the two groups of the GTQ amplifier may be used to drive a stereo pair of speakers with a mono speaker at the same time. This is sometimes used for centerspeaker applications or for inexpensive subwoofer addition with two-output amplifiers. Unlike a true bi-amplified subwoofer connection, however, this type of system configuration does not provide fine control of subwoofer-satellite balance. It requires the use of a passive subwoofer crossover instead of the superior active circuitry already built into GTQ amplifiers, and it does not separate the power amps driving the satellites from the amps driving the subwoofer. With the 4 speaker outputs already available on the GTQ amplifier, a stereo + mono connection for subwoofers should not be necessary. When using a group of the GTQ amplifier for mono mode fed with a stereo signal it is best to use the L+R mode. When feeding a single GTQ amplifier channel group with a mono signal from an outboard crossover, use the L mode and connect your source input to the left input of the desired group to be used in bridged mono. · Simultaneous Stereo + Mono ­ Set the Mode switch for the appropriate group to the stereo position. Main speakers are connected normally to the left and right stereo outputs of the group, and a center speaker or subwoofer speaker is connected to the same group as in bridged mode. Refer to the diagram on page 9 for connection details. Speaker-Level Input Connections When speaker-level signal is used to drive the GTQ amplifier, the signal goes into the amp through a special eight-wire harness/connector (see the "Controls and Connectors" section). If extension wires are needed between the head unit output and the amplifier unit, use conventional speaker wire or twisted-pair wiring. Keep the wiring inside the passenger and trunk compartments, and make the wires as short as possible. All connections should be securely crimped or soldered and insulated with heatshrink tubing. · Use the color code of the input harness wires and the identification on the radio/tape deck output wires to be sure that left and right channels are correctly connected and the positive/negative polarity of each channel is connected correctly. For example, the left positive output of the head unit must be connected to the left positive input of the GTQ amplifier. · The Universal Interface Speaker-Level Input may also be used to accept the signal from a preamp-level balanced-line driver capable of at least 4V output. [. . . ] Putting a filter on the head unit or signal processor power supply input may then be helpful. Using a portable powered speaker as described in the "Source Noise" section can help you isolate an individual component which may be sensitive to this. Start at the head unit, and work back, checking each component individually. Power wires carrying high currents may induce noise in nearby signal wires. Make sure that power wires and signal wires do not run together for long distances. [. . . ]