The short answer is “It depends…”
as for a longer answer. I do not think I can add anything of interest that has not already been said.
As a general rule, I keep them mostly parallel with the rear wall, toed in maybe a couple of degrees at best, but sometimes I need a change, and I toe them in.
in other words, not only does it depend on your room and equipment, it depends on your mood that day.
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