Hi Yakbob,
If you remember correctly that my first issue was finding the right amp.Due to high impedence curves on account of no crossover,this is quite a demand on an amp.
Provided your dampening factor is high,and slew rate is on point,150 wpc will make them sing.But try 400 500 or more per side and watch the Tantos transform your room even at low listening levels.Provided you feed them with clean and unadultered power.Indeed,their is the law of physics we have to respect here when dealing with a 6.5 inch driver.But as you well know its the cabinet itself that is producing this massive like bass too(due in part to a full transmission line enclosure,coupled with a V/Flex design.
I have so far used half of the amps full capability(power wise) and the Gemmes took it without a hitch.Its when I was trying certain cds(like Hadouk trio,patricia Barber) that this "boominess" became more and more apparent.But Solen assured me that this issue will be resolved.But nonetheless i will still have to respect the Tantos and keep it at under 12:00 just to be on the safe side,my ears included!
As for speaker placement,I have them currently at 24" from rear wall,with 4" thick Bass panels for where the firing ports are located.I have them at about 7 1/2 to 8 feet from each other and i am seated approx 10' away.