I just did this for QS4's. The easiest wall was an inside wall where I measured and drilled into the wall cavity from my crawlspace. I picked a stud for the bracket and drilled a 1.5" role right next to it. Then, I pushed fish tape up thru the hole in the crawlspace until my wife could grab it. Then, 14ga in-wall wire came down.
The opposite wall was harder - it was an outside wall with insulation and a fire break. I ended up pulling a couple runs of the vinyl siding off the house and cutting into the sheathing to run the wire. Replace the sheathing and reinstall the siding - took about an hour.
-Brian
2xM60ti, 2xM3ti, 2xQS4, VP100, EP350, N2's
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