I've always prefered to first get my room as flat as possible with corner bass traps, first reflection absorbers, etc. and then to use DEQ for bass only. That way it keeps all that processing out of treble regions that are more sensitive to digital corruption (ie. ADC/DAC).
But I'm curious as to how bad a delay is created by using a device like this on the woofer arrays (and subs) only. That's why I stayed away from it last time. It would be good if we could measure the delay that it creates (when the delay function is not used, obviously). I recall your telling me that any small delay created when dealing with very low frequencies, like the sub, is unlikely to be a big deal because those waves are bigger - but it might be a big deal when we're up around the LS9 crossover point if the DEQ is delaying the woofers.
I couldn't find any figures for the DEQX, Berringer, etc. since all of the manufacturers contemplate the devices being used on every driver.