I use subs in my main 2 channel system, too. My suggestion would be to exercise great care before replacing the Onkyo (or at least replacing it with a unit that does not share the Audyssey software).
It's entirely possible that other software has a "higher ceiling" for room correction/subwoofer integration, but Audyssey xt 32 is awfully good and virtually goof proof. I've used an (older and more primitive) manual room correction system and it was both a royal PITA and tricky to dial in. I'd assume that the newer systems are better, but the process is likely similar - repetitive manual manipulation of interactive parameters.
My guess is that going that route is probably as likely to yield worse results than improvements - unless you bring a lot of time and determination to the table.
Unless you are a really dedicated soul, I'd look elsewhere for an upgrade. Main L & R speakers are usually a good place to start.
It's entirely possible that other software has a "higher ceiling" for room correction/subwoofer integration, but Audyssey xt 32 is awfully good and virtually goof proof. I've used an (older and more primitive) manual room correction system and it was both a royal PITA and tricky to dial in. I'd assume that the newer systems are better, but the process is likely similar - repetitive manual manipulation of interactive parameters.
My guess is that going that route is probably as likely to yield worse results than improvements - unless you bring a lot of time and determination to the table.
Unless you are a really dedicated soul, I'd look elsewhere for an upgrade. Main L & R speakers are usually a good place to start.