You don't think that its because it is so cheap that they can't put all the shit on a smaller board?It's not inefficient, it just uses a large heatsink so people go, "Wow, that's a big amp ... Holy shit, 1600 watts !"
My friends are impressed by big, crappy DHD amps all the time ...
Actually the old school Lanzar's are good stuff, better than most of the crap put out today (by most companies, not just Lanzar).possibly old style... lanzar.