I am with Stanwal for the most part, though I haven't rolled any sub off as low as 25 HZ.
To me the integration is the different speed characteristics. A "slow" sub is very difficult to mate with speakers. This is the area that is most noticeable as well in listening to music.
I am suspicious when I see subs with 15" drivers advertised (especially if they don't cost a fortune $5K-$10K+, and to some degree even with those that do cost a fortune). A 15" driver is a lot of driver to move quickly and stop quickly.
In my book, the faster sub will be easier to integrate. I would rather give up some absolute bottom frequency extension to insure I get the speed I need (especially with your ATC speakers).
To me the integration is the different speed characteristics. A "slow" sub is very difficult to mate with speakers. This is the area that is most noticeable as well in listening to music.
I am suspicious when I see subs with 15" drivers advertised (especially if they don't cost a fortune $5K-$10K+, and to some degree even with those that do cost a fortune). A 15" driver is a lot of driver to move quickly and stop quickly.
In my book, the faster sub will be easier to integrate. I would rather give up some absolute bottom frequency extension to insure I get the speed I need (especially with your ATC speakers).