B/W 702 s3

If you do the Klipsch you'll have the same lacking bass problem. I think your current B&W's are better and more resolving than the Klipsch IF you'll fill in the low end properly they will sing! They need a sub. Most of the modern day speakers benefit from a sub. Maybe 2 subs!! 

Two subs are needed to add a solid foundation to otherwise very good speakers.

I have never had a sub, probably should look into that.  Here is my living room set up.  Thank you all, I appreciate your advice. 

B&Ws are known for bass. The 702 gives the 802 a run for the money, especially in punch. Punch is bass above 40Hz. But two subs will give you better results than another amp for about the same price.

Likely you have bass suckout in the 60Hz region. Many rooms have this. Subs can help to fill it.

These are pretty much out of the box measurements on my 802D2 and DB1D for music. The 802 was calibrated to minimize cancellation below 40Hz but the curve is the same out of the box elsewhere. The 802 gets decent output to 18Hz. The sub extends it to 8Hz. Calibrating the sub removes the 2nd hump and partially fills in the suckout from 70-100Hz. The 702 should probably get you to about 25Hz but feels more tactile above 40Hz because of the smaller box.

I had a pair of DB4S but you need at least two to get satisfactory output (for music) in a living room. Four would have been ideal. Sealed subs are best above 30-40Hz. Ported better below 30-40Hz.

https://mega.nz/file/7ExmzKzQ#uPb0-IEE9MOgLsMYxbjF1y1yjw-tTAjirY-28HvSoa4