Weird, I’m confused.

[TankTop5]

So I adjusted my main listening position to be perfectly centered and figured I’d do a basic speaker distance change in my AVR to make them equal with no other changes. Now the highs roll off way too low (no measurements just ears) and I normally listen -20db which is loud enough, now I need to listen around -15db for the same volume level. I’m going to do a full reset and start from scratch but I’m just confused on why the changes were so drastic with only a .2” change in one speaker distance? Anybody have a clue?

 

[ryanosaur]

Need more info.
What does “centered” mean? You moved your LP... but where in the room? How far from it’s original position?

What is “basic” speaker distance change? How did you measure? Do you use room correction or no?

FWIW, very small movements do matter. I fixed a 20dB suckout by moving one of my speakers about 1-1.5”. It is no longer symmetrical with the other speaker, either. Neither are my subs... all are different distances from each other (and the LP) and in my room that yields the better response.

Depending on where everything is, your LP could be right in a null for you room. Your speaker could be in a spot that has a reflection cancelation. A lot of variables.

 

[TankTop5]

Need more info.
What does “centered” mean? You moved your LP... but where in the room? How far from it’s original position?

What is “basic” speaker distance change? How did you measure? Do you use room correction or no?

FWIW, very small movements do matter. I fixed a 20dB suckout by moving one of my speakers about 1-1.5”. It is no longer symmetrical with the other speaker, either. Neither are my subs... all are different distances from each other (and the LP) and in my room that yields the better response.

Depending on where everything is, your LP could be right in a null for you room. Your speaker could be in a spot that has a reflection cancelation. A lot of variables.

Canted both speakers in equally so the my 12’ listening position so that I can looking down the inside line of the speakers and they are pointing just slightly behind my head. I moved my main listening position about 6” to center it. My right wall is about 5’ from the right speaker but the left side opens into a modest sized dining room and behind me is about 8’ of open space with a split staircase going down.

Reading into what you’re saying I may be better off with an offset listening position due to a closed right side of room and open left with my listening position offset to the left?

How do I measure for a null in my room, is that the sub crawl?

 

[ryanosaur]

Re: a null, though it is more commonly associated with LF, you could still have found your new LP in one...
(just spitballing here, trying to help brainstorm a solution)

Without knowing your full room dimensions, and where your LP is in relation to all boundaries, there are a few simple things worth trying by themselves or in combination...
Push LP back 1 more foot...
Come closer to your speakers...
Pull your speakers a little further into the room...

I don't think that the measurements you did share in terms of where your listening area is indicate a obvious point of concern...

Canted both speakers in equally so the my 12’ listening position so that I can looking down the inside line of the speakers and they are pointing just slightly behind my head. I moved my main listening position about 6” to center it. My right wall is about 5’ from the right speaker but the left side opens into a modest sized dining room and behind me is about 8’ of open space with a split staircase going down.

How far apart are your speakers?

I prefer my LP further away than the distance between the speakers, Isosceles instead of Equilateral triangle. Not that this is going to change SPL at LP, but you brought it up, so I thought I'd share. I toe my speakers so I am seeing a little bit of the inside panel, similar to you, but it sounds like mine might be a touch more wide and aiming further behind me.
They are wide dispersion speakers and I was advised ~15º off axis listening was preferred. Also, I was advised no toe in, but that geometry doesn't work in my room, hence why I do that.

More than anything, the placement of your speakers and LP in your room are the key items. This video from Dynaudio is a good one. Seemingly a little long, but they go over some great points.

Anyway, unless you deep dive into testing with a microphone and REW, you will be hard-pressed to lock in on any one single cause. I've had good success you the Audyssey XT32 App and the "Before" graph to help identify inconsistencies between channels and other placement problems.
That said, based on what you have shared, I think those minor changes just happened to coinicide with a less than ideal acoustic location in your room (or the flipside for that matter, that you were in a modal boost before and are now out of it. Neither of those is ideal, though).

Experimenting a little further with your placements seems like it could be beneficial/educational, especially if you are able to get any kind of graphical information for the response at your LP.

Hope this helps!

 

[Pogre]

Did you recalibrate (run setup) after you moved the MLP?

I see Ryan set you up with some good starting info.

 

[Pogre]

I prefer my LP further away than the distance between the speakers, Isosceles instead of Equilateral triangle. Not that this is going to change SPL at LP, but you brought it up, so I thought I'd share. I toe my speakers so I am seeing a little bit of the inside panel, similar to you, but it sounds like mine might be a touch more wide and aiming further behind me.
They are wide dispersion speakers and I was advised ~15º off axis listening was preferred. Also, I was advised no toe in, but that geometry doesn't work in my room, hence why I do that.

Interesting. I'm set up like an isosceles triangle also. 10' between my front 2 and I sit 15' away. My last calibration I toed my mains out to where I can barely see a sliver of the outside panels. Before I had them toed in more and pretty much always have.

I saw some measurements that suggest my speakers have a little bit flatter response off axis and good dispersion as well so that's why I'm trying it out. The good news is, it doesn't seem to have affected imaging in any negative way. Stuff still locks on dead center when it's supposed to.

Whether it's better or not is hard to say. I lean toward yes, I think it opened up the soundstage a little and I can hear better separation between instruments but that could so easily be me just wanting there to be, lol. Either way it's not dramatic. I have found tho, that sometimes those little improvements are even more noticeable when you put it back the way it was. I've had that happen a couple times too.

Sorry, I got a little rambly there. More thinking aloud than a question or anything.