JBL GTH400-20107 manual Non-fading subwoofer output on Group

GTH400-20107 06/03/98 15:49 Side 10

to use in conjunction with a high- pass filtered input signal to create a bandpass crossover (for a midrange or midbass driver). Set the switch to H (high) to activate the high-pass filter for use with satellite speakers or tweeters on an amplifier group.

13.Mode Switches – These switches are used to set the input mode for both preamp and speaker-level inputs.

Set the switch to ST(ereo) for normal operation on the group using individual left and right inputs. Set this switch to L to drive both the left and right outputs with only a single input on the left jack. Set the switch to L+R to sum the left and right inputs for a mono output on the group. These switches do not affect the preamp outputs.

14.Bass EQ Switch – These switches activate a built-in Bass Boost circuit used to increase low-bass output on the selected group. These switches do not effect the preamp outputs.

15.Group 2 Input Switch – This switch is used to select which inputs will drive Group 2 of the amplifier. Put the switch in position “GR 1” to allow Group 2 to be driven by the Group 1 inputs. Put the switch in the “GR 2” position to drive Group 2 with the Group 2 inputs.

16.Group 3 Input Switch – This switch is used to select which inputs will drive Group 3 of the amplifier. Put the switch in position “GR 3” to allow Group 3 to be driven by the Group 3 inputs. Put the switch in the “GR 2” position to drive Group 3 with the Group 2 inputs. Put this switch in the “GR 1+2” position to drive Group 3 with the sum of Group 1 and 2 for a

non-fading subwoofer output on Group 3.

17.Remote Bypass/On Indicator – This indicator is on when the Imaging Enhancer is engaged and off when the Imaging Enhancer is bypassed.

18.Driver/All Optimizer Indicator – This indicator is on when the Virtual Center Channel circuitry is in “Driver” opti- mization mode and off when it is in the “All” passenger mode. Note: The enhancer on indicator must be on before driver’s mode can enabled.

19.Front Ambience Control and On/Bypass Switch – Rotating this control adjusts the amount of ambience and front staging width produced by the Imaging Enhancer. Pulling the knob places the Imaging Enhancer in “Bypass” mode. Pushing in the knob places the Imaging Enhancer in “On” mode.

20.Rear Ambience and Driver/All Optimizer Control – Rotating this knob controls the amount of rear-fill ambience and the “room size” of the acoustic environment when used in a system with rear speakers. Pulling the knob out places the Imaging Enhancer in “All” passengers opti- mization mode. Pushing the knob in places the unit in “Driver” optimizati- on mode. Best results at the driver’s position will be achieved with the control in the “Driver” setting.

		IMAGING ENHANCER
17	ENHANCER ON		DRIVER MODE		18
	FRONT AMBIENCE			REAR AMBIENCE
	ENHANCER			DRIVER
	ON
19	BYPASS			ALL	20
	MIN	MAX	MIN	MAX

Power Indicator LED (on amp chassis top) – LED steadily illuminates for normal operation. LED blinks when protection circuitry or muting is engaged.

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