Bi-amping question

Well thanks for the responces. The issue of having the same "gain" was what I had been reading about and didn't quite understand. The info about the Sttaf bass being a mid/bass was something I hadn't thought of. I have no interest on adding a subwoofer, more powerful bass isn't what I'm after. I find I have the volumn knob at 12:00 for many of my CD's even though I'm in a 13X20 room and sitting 7-8 ft awawy from the speakers. I guess I'm used to a volumn setting of 9-10:00 on other systems and just thought maybe this would be a good idea. I'll just keep it as it is.

Done properly a subwoofer will increase dynamics, soundstage and detail. You should not know the sub is even turned on until you turn it off.

Concur 100% with this. When set up properly it is wonderful. Just last night I moved my system out of my dedicated room (daughter returning from school for summer) and was listening to Beck's "Sea Change." The bass was overwhelming so I turned the sub off. Things were better but definitely lacking so I went to work adjusting the sub for its new placement and before Beck was finished the sub was dialed in. Now if I turn the sub off it is only noticed in the very lowest register, more of an ambiance thing.
This is with a pair of Proac 1.5s which aren't exactly bass shy speakers. I don't think I'll ever be without a sub in my system again.

I agree with Bob Reynolds regarding the sub.
However, I do not remember if you mentioned what speaker cable you were
using. I might think, i your cable manu, has a product that is alike in the highs and mids, but is thicker, you'll get more bass. 14 gauge, verses 10g. But, that is if they swear the other characteristics are the same.
*Maybe a less expensive solution. I'd go for the sub, generally having
a contour control to be just where you want it, including "hardly
perceivable" if that's how little addition you need.

count me as one more in total agreement with Bob reynolds.

It's not about more powerful bass at all. It's about deeper bass which does wonderful things as Bob indicates.

If you don't want to make this investment, another option may be to upgrade to an amp with a little more power. You don't mention which amp you're using, but a Tube amp with 30-50 w/c will be plenty IMHO. 15 w/c is perhaps just below what you really need for the Sttafs.

Sorry is it sounds like we're trying to get you to spend more money . . . I guess that's the truth of the matter though given the problem you're saying you want to solve.