The older original symmetry had a pc based module system, the evolution of that was the above symmetry epx and epx2.
the epx2 had the ability to ad a 28 band eq board, there is also an available dsp card but i don't have one of those yet.
the crossover section is awesome....
front hp, front band pass, rear high pass, rear bandpass, and sub out. All digital and programmable.
the eq will let you adjust l & r channels individually, along with programming it to change eq presets at different banks of volume ranges 3 or 4 times through the volume range....
i have 2 of them but need to find a second controller