i think that the difference in sensitivity of the speakers could cause level matching problems, like rabbit suggested. having amps that have adjustable gain controls on them would really help. in all likelihood, the gain will have to be set to 0 dB on the amp driving the AL, and the other amps will have to be dialed back, maybe to about -10 dB or thereabouts. but i'm just guessing on the numbers.
for my home theater setup i'm using M-1.5t and PM-1.5 amps. the PM-1.5 amps have adjustable gain pots on their input, so that you can dial down their input sensitivity to match the levels.
if you don't have amps that have adjustable input sensitivities, then you're going to need a 7.1 preamp that allows you to independently adjust the output levels for the different channels, or you're going to have to run the outputs through some sort of mixer to establish control on the levels.
i think that no matter what, you'll need independent volume controls somewhere in the system for level matching.
Carver Preamps: C-1, C-2, BillD's JVD-modded C-4000, C-9
Carver Amplifiers: BillD's C-500, M-1.5t (4) PM-1.5 (4) M-500t (2)
Repair/Restoration/Upgrade expert for all of these components.