1. No, They are different types of speakers. The Beltronics Speaker is an amplified speaker and the AL one is not. On the AL the amplifier is being into the controller.
2. The CPU is not water and moisture proof and if you mounted the CPU under the dash you would surely kill it and if moisture gets in the CPU you would void your warranty. You are much better off mounting the unit under the dash and running the wires through the firewall. You can run the power line just as easily though the firewall as you would if you left the CPU under the dash and ran the controller wire through the firewall.
There are a few Jeep installs here if you do a search for Jeep.
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