Hi Mike - long time admirer of your application to the task! I'm hoping to learn from some of your trials and tribulations if possible.
I was wondering about your DartZeel's - I'm considering one amongst a few others (Lamm 1.2, VTL S400) - but only one (budget, you know!) yet I see both yourself and LakeFrontToad have used two amps. Is this a function of VS speakers that perform better with more power, or that the amps are a bit short on power? I'm looking to drive a pair of 89dB efficient Wilson Sophias in a room 14' by 16'. Do you listen normally where you can hold a conversation, or need to turn it down to see if that was the doorbelll ringing? :o)
On a lighter note - did your one in front, two behind, seating arrangement stem from the million dollar Maclaren F1 car? Any crossover here? Just jokin' !
:o)