Given the on-going resurrection of my vinyl collection--see:
I decided to review the set-up of my speakers. The initiative was spurred as I noticed a slight shift of the balance to the left, made more noticeable by more attentive listening to the increased clarity of my old favourites. I did check other sources and the shift was there too, but had gone basically unnoticed. It wasn't large by any means but it started to bother me.
I've always been fairly fussy (some might say anal😃) about set-up so I wasn't really expecting much. Boy, was I surprised.
My room is very asymmetrical, with a cathedral ceiling of about 3 metres. The speakers are approximately 750 mm from the wall, 2.7 metres apart and my listening chair sits 3.5 metres back from them with 2.8 metres to the wall behind me. I've spend a fair while getting this set-up and it works well. I'm not convinced it's perfect but I got tired of moving heavy speakers and furniture.
I put my chair on the centre-line between the speakers, got the tape measure out and proceeded to measure everything.
One speaker was closer to the wall by about 30mm. One speaker was angled more than the other with a 15mm difference when comparing the R-L spike positions. One speaker rocked slightly while the other was rock solid to the concrete slab. The rocking speaker was tilted down by about two turns of one thread locking nut.
I evened everything up and lastly put the listening chair precisely on the apex of the chair/speakers triangle. All measurements were now the same within a mm or two.
I sat down to listen, and WOW. The 'image' was now precisely in the centre between the speakers with some sounds extending beyond the outside of the speakers by several feet. The image was exceptionally stable and the clarity of the music improved again. My involvement in the music was so improved that I've had trouble reading, having to stop and just listen, eyes closed.
As above, I'm falling behind in my reading.😧😧
I haven't listened to digital in a couple of weeks. (Advantage--Even though I bet I'm listening more and louder, my tinnitus is less!?)
Moving my seating more than a very few inches from the 'hot spot' means the image shifts to the right or left. The quality is there--but the centre shifts. (Speculation: The shift seems more than can be explained by loudness issues and I'm wondering if it could be related to the sounds from the right and left no longer arriving simultaneously. 5000 Hz (below which most of the music lies) has a wavelength of 2.7 inches, so moving 3 inches right or left would delay the long side by one wavelength. Comments and experiences please.)