dbx Analog Loudspeaker Crossover

All three crossovers use the same filter design, a state-variable Linkwitz-Riley alignment at 24 dB per octave, which is the standard that keeps the summed response flat and the drivers in phase through the crossover region. Frequencies are set on the front panel from 45 to 960 Hz, or 450 Hz to 9.6 kHz with the x10 switch engaged, one switch per channel.

The 223xs is the two-way stereo box that becomes a three-way in mono mode. The 234s and 234xs are three-way stereo, four-way in mono, differing only in connector: 1/4-inch TRS on the 234s, XLR on the 234xs and the 223xs. Every model adds a 40 Hz Butterworth 12 dB per octave high-pass per channel to keep subsonic energy out of the drivers, a phase invert switch on each output, and an LF sum for feeding a single subwoofer from a stereo pair. Dynamic range is better than 106 dB unweighted on any output.