JBL SDP-40HD manual BGC Boundary Gain Compensation

SDP-40HD Setup

SETTING CROSSOVER POINTS (continued)

THX ULTRA2 SUB									ON, OFF
							ULTRA2 SUB
	SETUP		SPEAKERS		CUSTOM SETUP
	or
		SETUP		SPEAKERS		SYNTHESIS 7CH		ULTRA2 SUB

Enables boundary gain compensation (BGC) for THX Ultra2- certified subwoofers.

•Select ON if the subwoofer using the Main Zone audio output connectors labeled Subwoofer L/R is THX Ultra2-certified. When ON is selected, the BGC parameter can be used to adjust boundary gain compensation.

•Select OFF if the subwoofer using the Main Zone audio output connectors labeled Subwoofer L/R is not THX Ultra2-certified. When OFF is selected, the BGC parameter is not available (N/A).

BGC (BOUNDARY GAIN COMPENSATION)									ON, OFF
	SETUP		SPEAKERS		CUSTOM SETUP		BGC
	or
								BGC
		SETUP		SPEAKERS		SYNTHESIS 7CH

Adjusts boundary gain compensation when the THX ULTRA2 SUB parameter is set to ON.

•Select ON to apply a high pass 55Hz filter to all Main Zone audio output connectors and listening modes.

•Select OFF, and no filtering is applied to the Main Zone audio output connectors and listening modes.

Note:

BGC compensates for increased bass energy that is caused by the proximity of the speakers to the listening room walls.

ASA (ADVANCED SPEAKER ARRAY)									ON, OFF
	SETUP		SPEAKERS		CUSTOM SETUP		ASA
	or
								ASA
		SETUP		SPEAKERS		SYNTHESIS 7CH

ASA is a proprietary THX technology to process rear channel signals to optimize the listening experience for THX Ultra2 listening modes, including THX UL2Cin, THX MUSIC, DTS THX UL2Cin, DTS THX MUSIC, 5.1mc THX UL2Cin, and 5.1mc THX MUSIC. Applied to film sources, ASA processing blends surround channel signals to optimize ambient and directional surround sounds. Applied to music sources, ASA processing places surround channel signals on a wide, stable rear soundstage.

ASA processing is available when one of the THX ULTRA2 listening modes is activated and both side and rear speakers are present.

The ASA parameter can be changed in any mode, but the change will have no effect unless the above conditions are met.

To maximize the effectiveness of ASA processing, configure a 7.1-channel speaker setup so the rear speakers are placed close together facing the center of the listening space.

•Select APART if the distance between the rear speakers is greater than 4 feet (1.2m).

•Select CLOSE if the distance between the rear speakers is greater than 1 foot (0.3m), but less than 4 feet (1.2m).

•Select TOGETHER if the distance between the rear speakers is less than 1 foot (0.3m).

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