Harman-Kardon Comprehensive Crossover Manual for 234XL and DBX 223 Models

2-Way, 3-Way	223/223XL -234/234XL	3
4-Way Crossovers

INSPECTION

Before going any further, you should take time to fill out your warranty registration card and inspect the contents of the shipping carton. Inside both the 223/223XL and 234/234XL boxes you should find the following:

•either the dbx model 223, 223XL, 234, or the 234XL crossover.

•operation manual (you are reading it!)

•4 rack screws and washers

•power cord.

The contents of this manual are subject to change at any time without notice.

dbx 234/234XL Front Panel

Note: There are no front panel differences between the 234 and the 234XL. Therefore the 234XL is shown below, representing both the 234 and the 234XL.

1 2 3 4 5 6 7 8 9 10 11 12

		CHANNEL ONE																			CHANNEL TWO
	0			240			2.4k			-10				-10			-10			0			240				2.4k			-10				-10				-10
		140			350	1.4k		3.5k														140		350		1.4k		3.5k
-6		+6						-30				-30				-30			-6		+6								-30				-30			-30
		70			680	700		6.8k			0				0				0		40 Hz	70			680	700			6.8k			0			0				0
		40 Hz									INV				INV				INV														INV			INV			INV
					x10																				x10
-12	dB	+12	45	Hz	960	450	Hz	9.6k	-	dB	+6		-	dB	+6	-	dB	+6	-12	dB	+12	45	Hz	960		450	Hz	9.6k	-	dB	+6		-	dB	+6		-	dB	+6
	GAIN		XOVER FREQ			XOVER FREQ				GAIN				GAIN			GAIN			GAIN		XOVER FREQ				XOVER FREQ				GAIN				GAIN				GAIN
	INPUT	LOW CUT	LOW/LOW-MID			LOW-MID/HIGH-MID				LOW OUTPUT			LOW-MID OUTPUT						MONO							HIGH-MID/HIGH							HIGH-MID OUTPUT					HIGH OUTPUT
	INPUT	LOW CUT	LOW/MID			MID/HIGH				LOW OUTPUT				MID OUTPUT		HIGH OUTPUT			STEREO	INPUT	LOW CUT	LOW/MID				MID/HIGH			LOW OUTPUT					MID OUTPUT			HIGH OUTPUT
		13			14						15				16				17 18 19		20				21								22			23			24

STEREO 2-WAY MODE

In 2-way stereo mode the controls are marked BELOW the horizontal blue line.

Channel One and Channel Two functions are identical in the stereo mode. Front panel controls not described in this section are not active in stereo 2-way operation.

[1]	& [7]	INPUT GAIN	Controls the INPUT level with +/- 12 dB of gain.
[13] & [20]		LOW CUT	Switch for selecting the 40 Hz high pass filter. An LED indicates the
			selection.
[2]	& [8]	LOW/MID*	Selects crossover point between the LOW and HIGH outputs.
[14] & [21]		X10 LED	Indicates that the LOW/HIGH crossover frequency range is 450 Hz to
			9.6 kHz.
[4]	& [10]	LOW OUTPUT	Controls the Low frequency output level with a range of -∞to +6 dB.
[15] & [22]		PHASE INVERT	Switch for reversing the polarity on the Low Output. An LED indicates
			that the phase is inverted.
[6]	& [12]	HIGH OUTPUT	Controls the High frequency output with a range of -∞to +6 dB.
[17] & [24]		PHASE INVERT	Switch for reversing the polarity on the High Output. An LED indicates
			that the phase is inverted.
[19]		STEREO	LED indicating stereo mode operation.

*although this control is labeled as “LOW/MID”, it operates as the crossover frequency control between low and high frequencies in stereo 2-way operation.

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