, if you have a cheap amplifier, and bad, if you have spent more than $3,000 on it (update: my HK 7550 was still worth the price with the M12s; end of update)

From the first moment that I heard Martin Logan products in my home there was a sense of immense clarity over my previous system (a top end system from a respected vendor).

I enjoyed the R5Bi bookshelf speakers because of all the subtle and refined characteristics they have over the R55Ti towers (top end, a pristine upper midrange and being less colored or more neutral).

The point source KEF Uni-Q drivers provide a smooth and detailed frequency response along with a tight, focused image and the larger 6.5" Uni-Q of the Q300 allows for better low end response then the Q100's 5.25" driver without stepping up to the larger Q700 tower

The subwoofer takes care of the occasional soft bottom end and the center channel helps improve the high end (I happen to use an R5Bi for my center channel).

The R5Bi bookshelf speakers have a more open and clearer top end.