User manual JBL GTQ190

[. . . ] GTQ 190 - English 06/03/98 11:49 Side 1 Introduction . 10 Simultaneous Speaker-Level + Line-Level . 10 Owner's Warranty Information Model Number Serial Number Dealer Name City, State, Zip Sales Receipt Number Date of Purchase 01 Owner's Manual Adjusting the Gain . . 11 11 11 13 13 13 13 15 15 GTQ 190 - English 06/03/98 11:49 Side 2 About Installation Features · 4-, 3-, or 2-Channel Operation · Simultaneous Stereo + Mono Operation · 2 Built-In Independent 18dB/Octave Frequency Selectable High-Pass and Low-Pass Crossovers · 2 Pairs of Preamp Outputs · No Current Limiting · Oversized Floating Rail MOSFET Switch-Mode Power Supply · "Common Sense" 2-Way Turn-On with Remote-Out Capability to Turn On Other Amplifiers or Signal Processors · Switchable Bass Boost · "Stealth Remote" Silent Turn-On Circuitry with Power-On Indicator · Balanced Speaker-Level Inputs · Mute Input ­ Accepts Standard Noise Gate Input to Silence the Amp During No Music Conditions · 2 Continuously Adjustable Gain Controls · Capable of Single-Ended Operation into 2-Ohm Loads · Fully Complementary, Direct-Coupled, Discrete Power Amplifier Circuitry · Gold-Plated RCA Input Connectors · Gold-Plated Power and Speaker Connectors · Third Order (18dB per Octave) Capacitive/Inductive Power-Supply Filtering · Independent Input Mode Switching for Each Group of Channels · Made in USA Although the GTQ190 is designed to make installation as easy as possible, this is an extremely sophisticated product that requires proper installation and setup to realize its full performance potential. [. . . ] 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. If you wish to add a center speaker, connect the main pair of stereo speakers as in the stereo mode; connect the mono speaker as indicated on page 9 for bridge-mode connection. A highpower L-Pad or power fader can be used to attenuate the center channel for proper level matching. Each speaker should have an impedance that is equal to or greater than 4 ohms. The input-mode switch for the channel pair being used in Simultaneous Stereo + Mono should be set to STEREO. Keep the wire as short as possible. Do not run audio signal wires alongside power wires for an extended length either for the amp or the vehicle's standard power wires. When wires are run for long distances, separate the audio signal wires from power supply wires or vehicle wiring harnesses as much as possible. When signal wires and power wires must cross, try to keep them perpendicular. Avoid routing any wires near accessories such as ignition control modules, tachometers, fuel pumps or fan motors. · The line-level inputs of GTQ amplifiers accept standard phono plugs (also called RCA plugs). The outputs of most head units, equalizers, or crossovers also accept phono plugs. If another type of connector is used, adapters or special cables may be needed. Proper wire and connectors can be obtained from any JBL authorized installation specialist. · Note: GTQ amplifiers have 2 built-in frequency-selectable low-pass crossovers and also 2 frequency-selectable highpass crossovers. Be sure the crossover switches for each group and the preamp outputs are properly set for the chosen system configuration (see "Typical Applications" and "Add-On and Upgrade Steps" sections for suggestions). If you have any questions about how to set the crossover switches, contact your local JBL dealer. (­) (+) C L (+) C (­) 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 ­ 30A BATT(+) REMOTE GND BRIDGE 30A GTQ 190 - English 06/03/98 11:49 Side 10 Mode Switches These switches are set according to the number of inputs connected to the amplifier group and the desired mode of operation. See the diagrams on pages 4 and 5, and the descriptions below for options. [. . . ] Other Noise Sources ­ Common noise problems will be solved by proper grounding and power supply connections. However, there are impulsetype noise sources which may require suppression at the noise source. Many noise suppression devices (such as spark plug and coil lead suppressors, and rotor and coil bypass capacitors) are available at auto parts or car stereo stores. There are also noise suppressors that can be connected directly to the alternator that are effective in some situations. [. . . ]