I have Merlin VSM-SEs in a rather heavily damped room, and I also added a Rel Stadium II. I agree with Marklivia. The Rel does do it, probably with all speakers that roll-off their bottom ends smoothly and cleanly without "burping" or "harrumphing" as they reach their lower limit. That's because according to REL, their speakers work best as bass augmentation, i.e., adding bass that your main speakers running full range just can't produce.
adding "slam" to 2-way speakers?
i'm hoping to add more slam / energy to my room (15*25*10) as my speakers are 2 ways w/ a 6.5" woofer (merlin vsm). the sound i get is wonderful, but i would like it to be more 'visceral' if possible. would adding a sub accomplish this? i realize that it would entail a 2x coverage of certain freqencies (from 80hz down), but if its seamless & it adds slam, sign me up! any experiences? any merlin owners out there w/ experience? thanks!