Hello all, I am a two channel user who is looking into subwoofers and I have a few general conceptual questions. I have a really solid pair of floorstanding speakers that extend down to 35hz. (JBL 590) My question is if an 8 inch driver can reach 35hz at the same spl/dB/ect. as say an 18 inch subwoofer, is there any perceptible difference in bass quality? Is a bigger driver going resonate/fill up a room more fully than a smaller woofer will with all other factors being equal? (I want to know if a subwoofer can feel "bigger" without actually being louder in dB) Thanks, I'm trying to see if a sub would be much of a value add for me. I'm more interested in music, but I plan to integrate into a home theater at some point.