Just Got This Baby In After A Long Wait.
Everything is the same great package as the HD600/4 & 750/1..
HD900/5 100x4 + 500x1 or
3chl mode 150x2 + 500x1.
I run the 600/4.. after reading this product discription I may add the 900/5 to run my HAT setup, 100x2 to the L1v2 Tweeters 100x2 for the L3 Midrange (Quasi-Active Crossover Configuration)
Bridge my 600/4 on the L6 Midbass drivers
Toss the 500w on the sub.

tr0y_audi0