Naim can slam, T+A had good bass from all my listening sessions, Boulder sounded good to me with respects to bass delievery, Octave for a tube amp has very good bass levels on par with the others. Acoustic Reasearch was great as well. However none of these did I hear with B&W speakers.
Maybe you should look at a subwoofer
Dynaudio Focus 260s, Focus 210C, DM 2/6, Hsu VTF3 MK5 HP, Oppo BDP-103, NaimUniti 2, Naim Stageline N, Pro-ject 2xperience Classic, Marantz SR7007, 60" 4K Samsung LED LCD