JBL Professional MPC-XU owner manual IV. Typical configurations, Subsonic Filter Infrasonic Filter

CD Horn Equalization (Boost)—In addition to enabling the high-pass filter at Jx02, if you opt for CD horn equalization you must place a jumper at Jx03 as well. The MPC-XU offers two equalization curves for CD horn correction:

•For +6 dB of boost at 20 kHz, place the jumper across pins 1 and 2 of Jx03.

•For +10 dB of boost at 20 kHz, place the jumper across pins 2 and 3 of Jx03.

•To bypass the CD Horn Equalization, do not place a jumper in one position or the other.

Pins 1 & 2 Pins 2 & 3 None

The table at left is a summary of the jumper settings for the MPC-XU.

	Function	Header
	Bypass low-pass	J101	X
	Enable low-pass	J101	X
	Bypass high-pass	J102	X
Channel 1:
	Enable high-pass	J102	X
	Disable CD horn boost	J103		X
	CD horn boost, +6 dB @ 20 kHz	J103	X
	CD horn boost, +10 dB @ 20 kHz	J103	X
	Bypass low-pass	J201	X
	Enable low-pass	J201	X
	Bypass high-pass	J202	X
Channel 2:
	Enable high-pass	J202	X
	Disable CD horn boost	J203		X
	CD horn boost, +6 dB @ 20 kHz	J203	X
	CD horn boost, +10 dB @ 20 kHz	J203	X

IV. Typical configurations

Subsonic Filter (Infrasonic Filter)

Applications: Subsonic filters are commonly used in sound installations to filter out rumbles and other inaudible or unwanted low frequency signals and to protect speaker tuned vented speakers from damage due to excessive energy below the tuning frequency.

For a subsonic filter, determine the lowest useable frequency that the speaker can safely handle and set the high-pass filter to that frequency. Typical subsonic filters are set at 50 Hz, 40 Hz, 30 Hz or 20 Hz.

Program settings:

1Set Jx01 to bypass the low-pass filter (if not using) by placing jumper across pins 1 and 2.

2 Set Jx02 to enable the high-pass filter by placing jumper across pins 2 and 3. 3 No jumper on Jx03.

4 Insert proper resistor network in RNx04 socket.

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