Hi,
I recently purchased a Sig 30 that I am using with my Merlin VSM-MM's - sounds great so far, and though I haven't started comparing to my existing equipment to decide which will stay, I haven't turned the attenuator past 11 am yet. If you are interested, let me know how far from the speakers your listening spot is and I'll measure the sound level at a few spots on the Sig 30's attenuator - not perfect since rooms are similar but different, but it should give you an idea about how well the Sig will drive Merlins in general.