I bought a house that is prewired for surround sound in the family room.
Standard electrical boxes all mounted in the ceiling and covered with
plastic blank covers. I was thinking about buying 5 aluminum colored,
metal, blank plates and drilling each one with 3 holes. Two for the speaker
mounts and a small one to pass the wire through. Since my speakers are also
aluminum colored and so are the ceiling mounts, I was thinking this would
give the whole job a nice, neat finished look. The speakers weight less
than 1# and are 7" x 4" and I would think two screws through the plate would
be plenty strong. 2 nuts & bolts on each plate to hold the mount.
The only alternative would be to keep the blank plastic covers, drill a
small hole to pass the speaker wire and then mount the ceiling mount very
close by to all five of them. I think that would look too busy.
What you are talking will probably work, but ONLY if it is a metal box. I'd
suggest you try to bolt the speakers to the plates, with lock nuts. Since
the plates are pretty think, a screw won't have much bite. I'd then replace
the regular plate screws with something a bit longer as well. If the box is
plastic (or just a plaster ring and not even a full box) I'd mount the
speakers to the ceiling, preferably into a ceiling joist and run the wire to
the box. You can either drill the hole thru the plate (or buy ones with a
hole already in them) or buy a plate with an RCA jack and then use a short
jumper with an RCA plug from the speaker to the plate. Paint the plate the
color of the ceiling if necessary to make it less noticable.
Ideally ceiling speakers should be recessed into ceiling. If you don't
mind the looks your idea will do but MAKE sure they are very well
secured. I don't know how strong your amp. is it can vibrate the speaker
enclosure causing unpleasant acoustic problem. Only pseaker should
produce sound. Not the enclosure nor mounting plate.
Maintaining phase is simple. Just watch the speaker wires(it is
poloarized by color of wire or strand on the insulation, etc) and
where it goes to which terminal(usually marked with colored dot or size
of terminal spade) on the speaker.
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