The dbx 223, dbx 223XL (stereo 2-way/mono 3-way crossovers) and the dbx 234, dbx 234XL (stereo 2/3 way, mono 4-way crossovers) are extremely well built. The controls exude great precision, and the feel is a solid "click". And because dbx knows how difficult external power supplies can be to work with and even though it costs a little more dbx put's the high quality power supply right in the unit.

All the inputs and outputs on the dbx 223 and 234 are TRS differentially balanced 1/4" jacks, while the dbx 223XL and 234XL are balanced XLRs. All are bolted down to the chassis. This "nutting down" of the jacks insures that even if someone stomps on a cable plugged into the unit, it's not going to tear up the circuit board inside. All dbx crossovers all feature Linkwitz-Riley 24dB per octave filters, the professional standard.

Via a switch on the back panel of the 223 and 223XL, you first select whether you're operating your system in stereo 2-way or mono 3-way. The 234 and 234XL have two switches on the back panel for you to first select whether you're operating your system in stereo 2-way, 3-way or mono 4-way. Then you set, on the back panel, whether or not you want to mono sum the LF (subwoofer) out. (Most systems that use a subwoofer are mono subbed to take advantage of amplifier power and because low frequencies are non-directional.)

Back panel switches allow you to select the range of the crossover frequencies individually for both channels. The crossover frequency controls have a green LED that indicates when the x10 switch on the back panel is activated. All these switches are on the back panel because it could be disastrous if you were to change them mid-program.

On the front panel you'll notice there are LEDs that indicate whether the unit is in mono or stereo mode. Each channel has an input gain control for proper level setting. There's a recessed 40 Hz low cut (HPF) on each channel to remove unwanted low frequencies. Both the low and high outputs on each channel have a gain control ranging from - to +6 dB to allow muting of individual outputs and for level matching. Also, these outputs each have phase reverse switches that will help get you out of a bind without having to reconfigure your system. These phase reverse switches may be internally reconfigured as mute switches.

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