The rug is from Pakistan!

Having turned around my baffleless bass drivers into a "boxer engine" east-west configuration I've now reverted to the original north-south. For completeness, I explain. The initial result east-west was good, fewer room modes and cleaner bass. I knew though I'd need to reset the dsp I use on my bass - BTW the bass drivers XO at 100Hz.

My room is a challenge for bass, it's 15ft square with a 3ft bay at one end so overall it's 18ft x 15ft. These squarish dimensions are of course really bad for standing waves. To make it much worse...the ceiling is only 7ft 6ins high - this is in my cellar. The height of the room being exactly half the width of the room make the standing wave issue so much worse. Other 18ft x 15th rooms in the house have an 11ft ceiling, these rooms are much better acoustically but this cellar room is my dedicated "playroom" so on balance it's best.

When I tried to lessen the remaining room modes with dsp on east-west I hit some weird cancellations which seem to be due to the drivers firing at each other (yes, I messed with polarity to check). Each time I reset the dsp I get better at it so this iteration increased my ability. I applied the same learning to the north-south bass setup and have now significantly improved this. Hence I'm happy to stick with the north-south orientation.

Apologies for the convoluted explanation - I just wanted to clarify the bass driver orientation route I've chosen and why in case someone else tries this.

I may do at some point, I did think about such a 45 degree splay but given the cancellation I discovered my suspicion is I would get a different set of cancellations.  It's not as simple as just trying it as I'll only know how well or badly it works once I've set up the dsp properly.  This is 1 to 2 hours work.  My gut feel is that have the basses firing full-on at me is a good thing.  The bay is 6ft behind the speakers, yes the angles in the bay may not seem good but overall the bay helps the sound.