Bookshelf speakers with the good bass.

Hello
Recently I've purchased Harbeth Compact 7 speakers. Vocals
are beautiful but not enough bass. My room is 17' x 11' x 9'
and speakers are placed along the long wall. Listening
distance is 9'. Speakers are placed 14" from rear wall and
7' apart. I know that my room is not ideal and that I cannot
use floorstanding speakers. Any suggestions on bookshelf
speakers with the good bass for my room. I forgot to mention,
I really wouldn't like to use subwoofer
I can stretch up to 4K.
Thanks in advance