I want to add that TAD is the Japanese response to JBL....yes of course, they copy JBL and do it better on some parameters several years after.
also the 12" of TAD (the grey one) is a revisited 2202h with some improvements, but basically a copy.
To my mind, building a 4350/55 fully TAD would be one dream, but the cost is 3-4times higher...
I would go with TAD 1603 in your cabinets(with smaller volume, I suppose 150-170Lt) !!!
(and sell to me your E140 for my 4560 horn setup!! ehehe Just kidding).