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ont speakers have separate tweeters, do I need some sort of cross over to wire them up to the new amp ?
- is it good enough to simply bolt the amp to a chunk of MDF that is Velcro'd to the carpet ?



Can't speak with authority on Subarus, but unless you have some sort of premium sound package, any crossover for the front components are likely to simply be a capacitor in series on the tweeter (tweeter+cap then simply wired in parallell to the woofer)

How well velcro works depends on the type of carpet and the velcro, but normally works well. Velcro normally balances grip <-> open/close cycles, it can be meant for many cycles and then typically has less powerful grip.

If you want to be extra sure, consider metal brackets/whatever and anchor the MDF to the seats anchoring bolts... hard or easy depending on exact design...

Is the Scooby ICE FAQ helpful wrt. your model?
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/Michael