Hi folks, After a DSPeaker Dual Core 2.0 pulled me into DSP room correction, it was down the rabbit hole of digital correction of speaker response and the impact of the room. Two biggies in the reproduction of a recording, no? So I pulled the trigger on a DEQX unit, the HDP-4. It both corrects for speaker response, and the impact of the room, as well as correcting for phase and timing issues. Want to use active crossovers? Oh yeah, this will give you some serious crossover power in the digital domain (though I am not taking advantage of this yet). Just did my initial set-up (quick and dirty), and wow is this an impressive component. Even before having done room correction. Only scratching the surface so far. But mighty impressed. Let me know if you have any questions I can answer, and I'd love to hear from other DEQX users on this forum. To give you an idea of the DEQX capabilities, check out this article by Kal Rubinson at Stereophile: http://www.stereophile.com/content/deqx-premate-da-processordigital-equalizer Really exciting food for audiophile thought. Difference between bypassing the calibration and correction, and employing the DEQX to correct for speaker effects is not subtle.