So with Sofast1 talking about doing the phase adjustment and using Brian's calculator and it being good, I experimented a bit today with all this. My new RS SPL meter is still at work, so I can't take measurements yet, but I did a listening test and I'm noticing something interesting and unexpected. I was hoping you guys could see if this makes sense to you.
My Pioneer receiver after running MCACC set my sub distance to 9' 8.5"
Brian's calculator tells me to set them at 6' 8.5"
Here's my interesting results: I actually notice more bass with the default MCACC setting, but I notice tighter, more articulate bass at Brian's setting.
I used to DJ so I have a pretty good sense of timing and beats and can tell when two beats aren't aligned. It's almost like with the MCACC setting, the beat from the subs was slightly delayed sounding and therefore the overall sound was more muddy.
But with Brian's calculator setting, there is no separation of beat between sub and mains and therefore it sounds extra tight. The sub hits at the exact same time as the mains do. I never even realized it was off before hearing this. But strangely the overall output seems lower. I'm not noticing the subs as much as I am when it is set the way Pioneer is recommending it.
But since it is a cleaner sound, I think I'll keep it.
Anyone else find this interesting? What is the effect I am noticing? And why do you guys think it has an adverse affect on perceived SPL? As I understand phase alignment it should increase SPL. Of course I haven't actually measured this yet, so it could be all perception.