[Chrisbee]

Hi Roly

You ought to consider trying your drivers in series pairs first. If this provides you with enough power then you don't need to use 2 Ohms.

I am using an EP2500 myself with 2 x 4 Ohm 15" pairs in series for 8 Ohms per channel in my IB. This is a kinder load on the EP2500.

Great project. Make sure that your stage top is stiff enough to cope with the acoustic loading from all those lovely drivers. Use lots of cross-bracing to tie the top down and don't try to spare on timber cross sections. Things really like to flex when driven hard at low frequencies. You would not believe how things can flex until you see it for yourself!

Fire doors are much heavier and less likely to cause problems than ordinary domestic doors. They are also better sealed.