I'm surprised Dave didn't throw in a little comment about moi & my admittedly obvious affinity for Nakamichi & a/d/s/ products.
I'm curious, though, TonyD; why the different component speakers? Seems to me you'd want to keep the system consistent with a/d/s/ components & subwoofer.
Now before you call me a hypocrite, the only reason I went with the Infinity sub in my system instead of the A310rs.2 was Crutchfield had the Infinitys on sale with a free Q-Logic box & they were relatively identical in construction & specifications.
The only difference being the a/d/s/ is a dual voice coil (DVC) design while the Infinity is a single voice coil (SVC).
To answer your question, each of two channels can be bridged to provide power to each sub. If the sub you are using is the 'A' series, then I believe the recommended power range is 25 to 200 watts per voice coil & these feature a SVC design.
Your bridged channels should probably provide at least 50 watts but will likely be much more than that as Power Plates offer multiplied power ratings for bridged channels.
For example the latest P650 is rated @ 50 watts x 6 channels @ 4 ohms, but offers 150 watts x 3 channels bridged @ 4 ohms.
However, I also am not familiar with MA speakers so I cannot comment on them either.
As for how or where to mount them, the obvious solution would be a pre-fab or custom built box to be located in the trunk.
However, considering you are using a pair of 8" subs, you might be able to mount them in the rear doors if you are willing to spend the money & effort on some custom installation work.
This way you avoid taking up trunk space with a fairly large dual sub box. Plus I would think the entire system might sound better as the subs are located directly in the passenger compartment & thus not have to fire through the rear seats.
Hmmmm, now that I think about it this could be a potential update to my own system...
