User manual JBL GTS600

[. . . ] Introduction Thanks for purchasing your new GT series automotive amplifier. The GT series amplifier you have chosen includes many unique features to enhance its performance and utility. The power amplifier circuitry is a fully discrete design notable for its low distortion and unusually clean and clear sound quality. Your GT series amplifier will easily connect to virtually any car audio system, whether it is factory installed or one purchased separately. [. . . ] Set this switch to R to drive both the left and right output channels with only a single input on the right channel. Set this switch to "L+R" to sum the left and right inputs for a mono output on both amplifier channels. Power Indicator LED (on chassis top) ­ LED steadily illuminates for normal operation. LED blinks when protection circuitry or muting is engaged. Bass Boost Switch ­ This activates a built-in Bass Boost circuit used to increase low-bass output. LINE INPUT L L PREAMP OUTPUT SPEAKER LEVEL INPUT SPEAKER OUTPUT POWER FUSE 40A + R + _ L _ + R + REM IN REM OUT GND 40A _ _ L R R BRIDGED BATT(+) Preamp Level RCA Inputs Preamp Level RCA Outputs High Level Speaker Inputs Speaker Outputs Remote Turn On Output Battery Ground Battery (+12v) In Remote Turn On Input Fuse Power Connector BASS BOOST OFF ON INPUT MODE R STEREO L+R SPEAKER OUTPUT CROSSOVER FLAT LOW PASS HIGH PASS PREAMP OUTPUT CROSSOVER FLAT LOW PASS MIN HIGH PASS NOM MAX GAIN Gain Control Preamp Crossover Frequency Selector Amplifier Crossover Frequency Selector Input Mode Selector Bass Boost 3 3. System Design Using the GTS300 or GTS600: 3. 1 Speaker Requirements When used in the non-bridged mode the GTS300 or GTS600 can easily drive 2 ohm speaker loads. When only one speaker is connected to each channel, virtually any conventional speaker may be used. When the GTS300 or GTS600 is in bridged mode, the combined impedance of the speaker (or speakers) connected to the bridged channel should be at least 4 ohms. Sustained operation of the GTS300 or GTS600 in bridged mode with less than 4 ohms will likely cause overheating. The GTS300 or GTS600 must not be used with speakers that have either one of their input terminals wired to the frame of the speaker or to the chassis of the vehicle. 3. 2 Signal Sources The low level preamp outputs of any radio/tape deck, CD player or preamp/equalizer so equipped can drive the GTS300 or GTS600. The gain controls of the GTS300 or GTS600 are used to match the amplifier's input sensitivity to the output voltage of the source. This matching is important to keep noise low and is explained in the "Adjusting the Gain" section of this manual. Thanks to Universal Interface Circuitry, the GTS300 or GTS600 can also be connected to power amplifiers, radios or equalizers that are equipped with only speaker outputs by connecting them through the speaker level input connector. Inside the GTS300 or GTS600, the speaker-level and preamp-level inputs are connected through a mixing circuit, which allows them to be used simultaneously. Therefore a low level source, such as a CD player equippe with a volume control may be connected to the preamplevel inputs at the same time as a powered radio/tape unit is connected to the speaker-level inputs. This provides a higher performance alternative to an FM Modulator connection when you wish to add CD capability to a factory casette stereo. Switching from one source to the other is as simple as turning the desired source on and turning the undesired one off ­ no additional switches or relay connections are needed. Parallel Wiring (+) 2 Ohms Nominal Impedance 4 Ohms 4 Ohms (­) Series Wiring (+) 8 Ohms Nominal Impedance 4 Ohms (­) 4 Ohms 4. Wiring Proper wiring of the GTS300 or GTS600 and the associated 4 components is extremely important for proper performance and long term reliability. All wiring connections should be made either by soldering with heatshrink tubing insulation or with high quality crimp type insulated connectors installed with a good crimping tool. Soldering crimp connections is recommended to further enhance connection reliability. Never use wire-nuts, insulation-displacement connectors (i. e. ScotchLok type), or "twist and tape" connections. [. . . ] Satellite/Subwoofer Component Values for 4 Ohm Loudspeakers* High Pass Satelite Crossover Frequency: 100Hz C: 300µF capacitor 100V, non polorized Subwoofer Low pass Crossover Frequency: 100Hz L: 6. 2mH air core inductor (­) Right (+) C Subwoofer (Low Pass) (+) (­) Tweeter/Midrange Satellites (High Pass) Left L (+) C (­) GTS300 or GTS600 LINE INPUT L L PREAMP OUTPUT SPEAKER LEVEL INPUT SPEAKER OUTPUT POWER FUSE 40A + R + _ L _ + R + REM IN REM OUT GND 40A _ L R R BRIDGED BATT(+) *You may change the subwoofer satelite crossover frequency by using the Inductor and Capacitor values calculated with the following formulas: 30, 000 High Pass (Satelite Crossover): = New Capacitor Value in µF Desired crossover Frequency in Hz 620 Low Pass (Subwoofer Crossover): = New Inductor Value in mH Desired crossover Frequency in Hz 11 8. In Case of Difficulty Power-on light does not come on · Head unit not on; turn the head unit on. · Ground wire is disconnected or defective; check for continuity with an ohm-meter between the amplifier's ground terminal and a know chassis ground point. · Battery wire is disconnected or defective; check approximately +12 volts between the amplifier's battery and ground terminals. [. . . ]