I've recently started using the time alignment features of Hijack (v426, built for ext3), and I feel it has noticeably improved the soundstage in my car.
However, something recently occurred to me.
Since the empeg lacks separate, non-fading subwoofer outputs, am I not now 'smearing' my bass?
The low frequency signals come out of the empeg in stereo, but now (via Hijack) slightly offset in time (and therefore phase). When they are later recombined to mono in my subwoofer amp, each discrete bass note now spans a slightly longer period of time. Am I hurting my bass performance by using this feature?
I haven't done enough critical listening yet to know whether any differences are actually audible.

Thoughts? I'd kill for a non-fading subwoofer output on the empeg harness.