Lexicon SDP-40 manual Speaker Setup Custom Setup, Determining Crossover Settings

The SETUP Menu

JBL

SPEAKER SETUP

CUSTOM SETUP

SETUP SPEAKERS CUSTOM SETUP

The CUSTOM SETUP menu can be used to configure the MAIN AUDIO OUTPUTS for a custom speaker system. For a Synthesis 7- channel setup that requires THX-certified loud speakers, use the SYNTHESIS 7CH SETUP menu (see page 3-24).

	Default
Parameter	Value	Values
FRONT L/R	40Hz	FULL, 30Hz to 120Hz,
		THX 80Hz
CENTER	60Hz	FULL, 30Hz to 120Hz,
		THX 80Hz, NONE
SIDE L/R	60Hz	FULL, 30Hz to 120Hz,
		THX 80Hz, NONE
REAR L/R	60Hz	FULL, 30Hz to 120Hz,
		THX 80Hz, NONE
SUB L/R	MONO	MONO, STEREO, NONE
SUB XOVER	40Hz	FULL, 30Hz to 120Hz,
		THX 80Hz
LFE	OFF	ON, OFF

Determining Crossover Settings

The CUSTOM SETUP menu allows different crossover points to be set for the following MAIN AUDIO OUTPUTS: FRONT L/R, CENTER, SIDE L/R, REAR L/R, and SUBWOOFER L/R. Crossover points can be set in 10Hz increments within a 30 to 120Hz range. All crossover settings activate a 24dB per octave filter, with the exception of THX 80Hz, which activates a 12dB per octave filter. The graphs on the next page illustrate the frequency response of the crossover settings.

For each output, select the crossover setting closest to the low-frequency rating of the corresponding speaker. For the SUBWOOFER L/R outputs, select the crossover setting that matches the lowest setting of the other speakers in the system. Crossover settings determine how the unit redirects low-frequency signals.

In general, low frequencies will be redirected from the outputs with the highest crossover setting to the outputs with the lowest crossover setting. Remaining low frequencies below the lowest crossover setting will be redirected to the SUBWOOFER L/R outputs. If the lowest crossover setting is FULL, no low frequencies will be redirected to the SUBWOOFER L/R outputs.

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