There are two reasons I want a component subwoofer. 1. Kill the bass to my speakers for more clarity 2. Much better bass. I'm not actually looking for more bass. I normally don't crank music because I have tinnitus (constant ringing in the ears) and I don't want to risk making it worse. I don't care about really low low's either. I do care some about the sub being fairly punchy though. I should also mention that I'm going for a 150 rms fosgate amp and a 150 rms sub. Also, space is not an issue.

Even a 10" subwoofer doesn't seem to bump at all (almost no excursion) when producing a fair amount of bass at low volume levels. Will an 8" for example sound better at low volume in comparison to a 12"? Because I could actually get a 12" kicker for around the same price as an 8" (maybe fosgate, JL, etc.), but I would only consider it if it sounded the same or better at low volume levels. Any advice would be helpful.

Thanks!