ProAc 1.5's add sub or trade up?

I was in same situation before but found out that speaker placement, amp and speaker wire were the key to get the most
out of these speakers. I'm using White Audio Labs/Llano Design amps with very good result. My listening room is about 20'X17'X11' and I get good bass response down to mid
30's (-6db). I did try my HT subwoofer with this speaker but
did not like the result. The good bass drum response definition and imaging were no where near compared with the 1.5s alone.

As a prior owner of the 1.5's, I would suggest that you look to speaker placement before making any further changes. Check out the excellent instruction on the Audio Physic website.

Before I bought the ProAc 1.5's I already had a Vandersteen 2wq sub in my system. All I can say is that I am very satisfied with the bass produced with this combo. I think a Vandy sub is a great foundation for almost any system. It is a music sub not a home theater one. The filter system from the Vandy sub will also lower the distortion in the mid woofer and lessen the load on your amp to. I would also like to note that if blended properly this sub never calls attention to itself. If you consider this sub make sure you talk to a dealer that knows what there talking about or call Vandersteen to insure that it is compatible with your system. Good Luck!

Thanks for all the info. I am using them in a HT set-up with a marantz sr-19 (might be some of the problem) bi-wired (shotgun) with Harmonic Tech melody speaker wire. I guess I should look at entire package before making any decision. Thanks again

Thanks - Purchased a proac sub a week ago. Thanks for all your suggestions and recommendations.