To be honest i would keep the speakers and change the amp, i had the Monitor Audio br2's for a while and they are great little speakers but i also had the B&W DM603 S1 standmount speakers that i prefered over the MA speakers so i dont think your speakers would be lacking in bass but i feel your amp is letting the side down also what source are you using, cd or vinyl. Rotel amps are great with B&W speakers and you could pick up a new amp for the price of the MA speakers . There is also the Audiolab 8000s that can be picked up quite cheaply now or the Creek Evo that has plenty of power. Remember source first, amp then speakers, a lot of memebers will advise speakers make the greatest difference to upgrading but i feel this is false economy as the speakers can only pick up what's feed into them.