Rives answer (self-promotion notwithstanding :-) seems comprehensive as far as it goes, but in regards to the original question, I would point out that all dynamic speakers, except those specifically configured as dipole bass radiators (rare), are functionally omnidirectional at low frequencies. The Shahinians, of course, diverge from the norm in being configured to approximate an omnidirectional radiator at mid and high frequencies as well, a range the PARC device is not intended to address, unlike some of the units asked about. I agree with Rives that a dedicated, measurement-calibratable room-correction EQ device should be usable with speakers having any characteristic radiation pattern, omni included, and that such a device may be at its most useful with just such a speaker, as room interaction will be even greater than with conventional designs (but that's just an opinion based on theory, not experience ;^). He'd also probably tell you that at the frequencies above those dealt with be his PARC product, some judicious acoustical wall-treatments may be the first way to go with omni's, and he'd probably be right...
Room correction EQs with omnidirectional speakers?
My speakers are Shahinian Diapason, which are omnidirectional speakers. Also, I keep my conventional, forward-throwing Audioplay Reference-speakers. From time to time, I'd love to set up the Audioplay-speakers, which - being nearly 6 feet high, with two 30-cm-bass drivers, are too mighty for my room. I'd like to correct that, and, if possible, would like to improve the sound listening to the Shahinians as well. I do have a German Audionet ART V2 as CD-transport, a Chrod DAC-64, and McIntosh-preamp and amp. My question is: Does it make sense and is it possible at all to use a room correction system such as Behringer 8024, Tact or Z-Systems, with the Shahinians, which work with room reflections? Or is it good for conventional speakers only?