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223/223XL - 234/234XL
®
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.
3
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] H
IGH 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.
INPUT
INPUT
LOW CUT
LOW CUT
x10
LOW/LOW-MID
LOW/MID
LOW-MID/HIGH-MID
MID/HIGH
LOW OUTPUT
LOW OUTPUT
LOW-MID OUTPUT
MID OUTPUT HIGH OUTPUT INPUT LOW CUT LOW/MID
HIGH-MID/HIGH
MID/HIGH LOW OUTPUT
HIGH-MID OUTPUT HIGH OUTPUT
MID OUTPUT HIGH OUTPUT
GAIN
dB
-12
-6 +6
0
+12
XOVER FREQ
Hz
45
70 680
350
240
140
960
XOVER FREQ
Hz
450
700
6.8k
3.5k
2.4k
1.4k
9.6k
x10
GAIN
dB
-12
-6 +6
0
+12
XOVER FREQ
Hz
45
70 680
350
240
140
960
XOVER FREQ
Hz
450
700
6.8k
3.5k
2.4k
1.4k
9.6k
MONO
STEREO
40 Hz 40 Hz
-
GAIN
dB
-30
-10
0
+6
-
GAIN
dB
-30
-10
0
+6
-
GAIN
dB
-30
-10
0
+6
-
GAIN
dB
-30
-10
0
+6
-
GAIN
dB
-30
-10
0
+6
-
GAIN
dB
-30
-10
0
+6
INV INV INV INV INV INV
CHANNEL ONE CHANNEL TWO
dbx 234/234XL Front Panel
1 2 3 4 5 6 7 8 9 10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
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.