A little under 7'. The speakers are a little under 7' apart between the tweeters and over 5' off the front wall.
I'm over 4' off the back wall although there's an open hallway immediately behind my seat.
You want to sit as close as you can with the drivers still integrating because distance reduces their level relative to the reverberant field. 8' out from conventional speakers you may be getting as little as 1/16th of the energy directly from the speakers.
You want both yourself and speakers far away from reflective surfaces so your brain doesn't hear the reflections as part of the direct sound.
I'm over 4' off the back wall although there's an open hallway immediately behind my seat.
You want to sit as close as you can with the drivers still integrating because distance reduces their level relative to the reverberant field. 8' out from conventional speakers you may be getting as little as 1/16th of the energy directly from the speakers.
You want both yourself and speakers far away from reflective surfaces so your brain doesn't hear the reflections as part of the direct sound.