My experience is that the VTL 750 amps with the 5A is not a synergistic match. It is slow and dark sounding IMO, and simply does not work. I really like the Quicksilver V4 on the 5A. Take this with a grain of salt, because I have not heard the VTL amp that you run in your system. The 5A does IMHO, thrive on fair amount of power also. That's my $0.02. I am sure there are others with more experience that will chime in with their opinions.
Vandersteen 5A dynamics and bass response.
I am thinking of purchasing 5As or 7s when they come out. My hesitations are two fold: Is this speaker dynamically limited? Will the bass response live up to my expectations? I currently use a pair of Infinity RS1Bs which have 12 servo controlled bass woofers. Although the midrange and high frequencies leave something to be desired (veiled) the bass response is excellent and clean on the 1Bs. I suspect the 5As will never move enough air to make me happy. The posts on the dynamic limitations of the 5As are mixed. Are there dynamic limitations to this speaker if it is paired with the proper amplification? The RS1Bs are very dynamic and will play as loud as one could want at least with the VTL 300 and Perreaux 3150 amps that are driving them. Anyone have experience with these issues?