I know the vac 200IQ does not get a lot of praise on the forum but its sounds great with my Marten Speakers. I would be curious to hear it as mono blocks but the cost and the heat makes it unlikely that I will pull that trigger.
The marten with the VAC just sound so musical and sure not thunderous bass slam or set amp warmth but just sounds real so natural.....It works better in my system that the Pass 260.8 monoblocks which have more slam but ultimately was not right with the Marten.