Just wanted to thank everyone for your input and recommendations throughout this thread. After much consideration and careful planning, I have decided to go with the following 7.4.4 setup:
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The front left and right speakers are DALI Opticon LCR MK2 On-Wall Speakers
, which are mounted so that the bottom edge of the speaker is 95cm (just over 3 feet) above the floor level), and they're slightly closer together than before - the front of the sofa is 8 feet away from the TV wall, so the tweeters of the two front speakers are approx. 8 feet apart also
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Instead of rotating a third MK2 for the center, I'm going to setup a DALI Opticon Vokal MK2 Centre Speaker
on a floating shelf under the TV. It won't be perfectly in line with the tweeters on the front left and right, but it'll be pretty close.
The TV is now an 85 incher - the width and height are marked out with red tape. The center of the TV does feel quite high up on the wall, but with a slightly higher sofa and some head support, I think it should be fine.
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There are four in-wall Monitor Audio IWS-10 subwoofers
in this room; and they're each going to be installed in an IWB-10
pre-construction back box. The two front subwoofers will face outwards from the TV wall, and the rear two subwoofers will projector perpendicularly across the back of the sofa. The front subwoofers will be as far apart as possible, for a nice even bass and all four subwoofers are going to be positioned as low as physically possible. This setup is going to be powered by an Anthem MRX1140
AVR, which has two subwoofer line-level outputs. Each of those outputs will run to an IWA-250
amplifier. The first IWA-250 will power the front two subs, and the second IWA-250 will power the rear two subs behind the sofa. To avoid messing with the AVR's room correction, the front two subs will have to be on the same amp, and the two rear subs will have to be on the same amp.
For the side surround speakers, I decided to move them down by 1 foot in height (so that the bottom of the speaker is 47 inches/120cm above the floor level). I swapped out the Monitor Audio W280
in-wall speaker for the CP-WT260
, as the latter has pre-built back box enclosures, so we can simply cut out the plasterboard and insert the speaker, without giving the carpenters any extra headaches.
For the tricky rear surrounds, first I moved the sofa forward by one foot. So now, the front of the sofa is 8 feet from the TV wall, and there's a little more space between the back of the sofa and the rear speakers. Going with SoundFrame 3 In-Wall
for rear surrounds; they're a more compact speaker, and once again, the back box is pre-built. They're also quite a shallow speaker, which is good because the stud of the rear wall is only about 70mm deep. Line up the centre of the Soundframe 3's with the tweeters of the CP-WT260 side surrounds.
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For Atmos, instead of two overhead speakers, we're going with four C280-IDCs
. The front Atmos pair are 1/4 of the way up the length of the room (about 3 feet from the TV wall), and the back Atmos pair are about 3/4 of the way up the room's length (nearly touching the steel girder). Width-wise, everything is line with the front left and right DALIs. The C280-IDCs will use a Hoody 2
; won't bother with an in-ceiling back box.
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Thank you again to @gene
and everyone who commented for all your help and suggestions; will post pics when I have the cable runs
completed and when we start installing speakers in the room.