How did you determine the placement on the front wall? Have you modeled the subs and used that data in rew to find placement options?
When I first put the sub in my room that’s in there now that’s where I measured the flattest response. I spent 12+ hours over several days tweaking the placement and layout of the system, measuring response, group delay, phase, listening, manually eqing etc. to determine that placement spot and the listening position.
I’m a bit of a perfectionist with it, to the point where I made sure my speakers and seat were within a half inch of center reference to the side wall, spl within a .5dB tolerance of 85dB, acoustic panel placement determined using a room reflection simulator, all speakers exactly toed in directly at the mlp using a laser pointer, tweeters centered exactly at ear level using adjustable stands, crossover points set based on measured in room response, distance set within 1/10th of a foot, and the placement angles (22 degrees for the l/r, 110 for the surround, 55 for the top middle etc) were exact by calculating the angles of the triangle formed. I don’t believe I could do a better job of setting it up if I tried.
Multiple subs spread out across the room would no doubt flatten the response around the room, but since nobody sits outside of the Goldilocks zone, which is +-5dB from 25hz-24khz, it’s pointless for my setup.
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