Hi discnik,
That amp is a keeper. I had the Accuphase E450 integrated amp years ago and you can’t get rid of that, that thing sounded fantastic. The problem is the speaker connection on the Vandersteen’s. They use what’s called a barrier strip. Richard Vandersteen is convinced they sound better. In my opinion HCM dropped the ball, they should have asked you what amp you have and which speakers you have and they should have called you to say here’s what you need, got your approval and asked you can we proceed. That’s what a reputable dealer would have done. If those barrier strips sound better then many more speaker manufacturer’s would use them. If you like the Vandersteen speakers and you are owing to keep them, then I would ask your dealer much it would cost to install some good Cardas or WBT 5 way finding posts on the speakers. I know it sounds crazy but it’s worth looking into. The only other thing you could do is bring the speaker wires back to HCM and have them re-terminate them properly (like they should have done in the first place). Good luck.
Scot