ZYGI
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Brian,
Welcome to the forum!!!
I don't see any problem with the 5 foot spacing, as you could almost place the two feet apart and get a good image well beyond the width of the room.
Placing the ERR's one foot off the back wall, shouldn't be a big problem as long as its not that close to the side walls as well, I.E. corner. With the Torii-III which has a bass control knobs, should take care of any bloat you might incur. The passive radiator which is on the bottom of the speaker, between the base and the main cabinet, ports out the front and back. You could block the rear firing port, which would help if you were having problems.
Zygi
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