i'm using the Selenium D210Ti and there is no need for attenuation (along with the beyma 8g40 and the selenium 2k crossover - sounds incredible)
in your setup where you want to use coaxial hcld, i would look at using beyma all the way through ( 8xc20 coaxial, 8g40 driver, and the fd2xc1 crossover) with a big, big amp like a zapco, arc, or tru...
the beyma is so smooth sounding- the emmimence sounds course/bright/distorted in comparison. it is a pricey setup, but it will go insanely loud and stay "together" in comparison to anything else... the european drivers are that much better (comparing a yugo to a ferrari)
(Message edited by clubmyke on January 03, 2008)