PS Even when the record has issues, there's always the purists's question of whether you want to hear what's on the record or whether you want to "fix" what's on the record by tweaking the system.Marty I agree and it does take a while to come to a happy medium with all recordings. What worked best for me was to never move the x-over up once I started to hear too much bass.
Personally, I'm already there with systems that correct for the room. When they start selling the system that can adjust itself for the recording flaws, I'll be first on line to sign up.
That being said no one mentioned phasing/timing. The last thing you want is to have the sub either be ahead or behind the music. With my Rel B3 I had to move closer or farther but only by a inch or 2 at a time. BTW I just used my ears. I tried test cds with single frequency selections. For me when I had that (what I thought was dialed in w/the cd) it was way too much bass with music.
Again you have to listen with your ears. When I first had everything dialed in with my Dyn C1's I had my x-over set at 38 hz. The C1's are rated at 45hz. Then I upgraded to the C1 Signatures. Found the Rel to sound better at 34 hz. Next I upgraded my Frey Ic to the Tyr2. Here we go again - I had to reset the Rel again and now I have it at 32 hz. There are some recordings that don't go below 60hz. Don't try to fix that. Sounds like a pretty low x-over point but to me ALL my recordings sound good and balanced.