I'm an anti-fan of the trunk/boot imlpementation. That would be going backwards as far as I'm concerned.
I think I understand this view. In my case, without a secure garage, I don't use the Empeg in the car as much as I'd like. For sure on long trips, but when I make a trip to the store or a restaurant, I have the tendency to think ahead and just leave the Empeg behind rather than have to pull it out when I go into the store/restaurant. I'd vote for something that becomes invisible with less effort.
Another aspect for me is that the amount of space in the WRX behind the radio is extremely tight. It was *not* an easy install, so a "faceplate" type install has some appeal. Also, I'm thinking that putting the box/brains in the boot would shorten a lot of the critical interconnects and eliminate a lot of ground loop opportunities -- just one shielded 1394 cable running fore-aft.
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Jim
'Tis the exceptional fellow who lies awake at night thinking of his successes.