Bob, for 7k more or so, it's a huge difference. By upgrading to the built in subs, you get a much much more dynamic system with huge depth and it frees up my amp so it only has to handle 100hz on up. It's a killer speaker AND it makes the amp better. I personally love an active system if implemented properly. Doesn't mean that all active systems are great as some I've heard are still too bright for my ears or when done in the digital domain, it masks the sound a bit and throws it off. This is why I personally don't like speakers like Persona and some others that are using DSP. I have personally never heard any DSP sound as good as without.
Bottom line is that it's smoother and more natural. Those Treo's you have are outstanding. The tweeter difference is big, but in an incremental way not a night and day per say.
Bottom line is that it's smoother and more natural. Those Treo's you have are outstanding. The tweeter difference is big, but in an incremental way not a night and day per say.