Hey no worries.
One thing I neglected to mention is if you do any deep water crossings. I would be careful of the speaker, maybe make a quick disconnect mount. I guess it should really be for muddy crossings. I clogged up a loud horn that way, lol.
Anyway, passing through the firewall is easy, there are two ready made holes, one on each side. On the passenger side I have the wires for my lights. On the driverside I have two six gauge wires coming in for an auxiliary fuse panel under the hood. (I got the idea from "NewOldTimer").
Here is a good link for firewall penetration.
http://en.wikibooks.org/wiki/Jeep_Liber ... enetration