My friend also has a Lyngdorf 3400 plus corner bass speakers, his main speakers are Lyngdorf DP-1 - dipoles, like my Quads
His room is a large L shape, not ideal, but he was making a HUGE soundstage compared to my setup. Both irritating and inspirational!
His back wall, behind the speakers, are large glass doors onto the garden, either side just plain plaster, same for the ceiling, carpeted floor
So quite a reflective space, but not badly so. Anyway, that got me wondering why I couldn’t do the same?
Hence strip it all away, bar those rear diffusers, and start from basics
What we both have is freedom to place/sit
His speakers/seat approximates to the 1/3rds rule (for one side of the L) and the 5:8 rule (speakers 8 in, 5 out). After that, there was a lot of listening, incremental movements - and more listening (all in bypass mode on the 3400 bass channel off)
Once happy - you run the RoomPerfect, and that last 10% snaps into focus
My setup has the Quads around 40% into the room and I almost sit against the rear wall, head around 50cm from it - this shouldn’t work, but it does!
The quads are on PTFE furniture sliders so they’re easy to slide around. Once I’ve got the macro position about right, I use tape/biro to mark the position of the spikes front and side, then I can move/listen, move/listen etc and keep my reference position if things are sounding worse or I’m unsure. When real progress has been made, I reset the reference position with more tape
For a sanity check - I move the speakers a long way, say 0.5-1m back or forwards. If things don’t collapse and/or boom I know my reference is good
For the seating position, in my room, this is all about bass response. Hence I play various bass references (Janelle Monae ‘Let’s Get Screwed’ has some deeeep eyeball wobbling notes on it). I slide the sofa back and forth to get the best response overall - all that with the bass channel on, but room correction in bypass
That might require some speaker position tweaking, but generally not in my room
Finally, once it’s sounding good - apply the RoomPerfect and bingo
That’s better than mine