Something just struck me while looking at my options for wire routing. One of the better suggestions for speaker wire has been the low voltage lighting cable at Home Depot which is rated for outdoor use (I'll wade into that debate at a later time). If the speaker and your stereo setup are on exterior walls you might be able to get by with two penetrations with the wire routed outside. This would be a last resort for me as I'm not fond of a lot of exterior wall holes. To the crawl space.
Plaster walls on furring strips are a lot easier to work on than plaster on metal lathe.
