JBL manual Fuse – 40 Amp ATC type fuse for the GTS300 and two 40 amp fuses for the GTS600

9.Fuse – 40 Amp ATC type fuse for the GTS300 and two 40 amp fuses for the GTS600.

10.Gain Control – Use this control to adjust the input sensitivity of the amplifier. See the “Adjusting the Gain” section for tips on proper setup.

11.Preamp-Output Crossover Switch – This switch controls the built-in crossover that is directed to the preamp-output connectors. Set the switch to “Flat” for full band operation. Set this switch to “Low-Pass” to activate the low- pass filter on the preamp output (for subwoofer use). Set the switch to “High-Pass” to activate the high-pass filter for use with satellite speakers.

12.Speaker Output Crossover Switch – This switch controls the built-in crossover that is connected to the power amplifier circuitry. Set the switch to “Flat” for full band operation. Set this switch to “Low Pass” to activate the low

pass filter on the amplifier (for subwoofer use). Set the switch to “High Pass” to activate the high pass filter for use with satellite speakers.

13.Input Mode Selector – This switch is used to set the input mode for both preamp and speaker-level inputs.

Set this switch to Stereo for normal operation using both left and right inputs. 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.

14.Bass Boost Switch – This activates a built-in Bass Boost circuit used to increase low-bass output.

LINE

INPUT

L

R

➀Preamp Level RCA Inputs

➁Preamp Level RCA Outputs

➂High Level Speaker Inputs

➃Speaker Outputs

PREAMP

OUTPUT

L

R

SPEAKER

SPEAKER LEVELOUTPUT INPUT

+	+
R	L	+	+
_	_
		R	L
		_	_

BRIDGED

FUSE 40A

40A

POWER

REM IN

BATT(+)

REM OUT

GND

➄Remote Turn On Output

➅ Battery Ground	Power
➆ Battery (+12v) In	Connector

➇Remote Turn On Input

➈Fuse

	BASS BOOST	INPUT MODE		SPEAKER OUTPUT		PREAMP OUTPUT
				CROSSOVER		CROSSOVER		NOM
OFF	ON	R	L+R	FLAT	HIGH PASS	FLAT	HIGH PASS
		STEREO		LOW PASS		LOW PASS	MIN	MAX
								GAIN
								➉ Gain Control
								Preamp Crossover Frequency Selector
								Amplifier Crossover Frequency Selector
								Input Mode Selector
								Bass Boost
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