On Sun, 10 Jan 2010 15:28:05 +0000, Keith Garratt
wrote:

That may demonstrate just how MUCH room effects matter, as compared to
direct sound. Though I'm a little surprised they didn't notice any
hf drop-off as the tweeters moved out of view.


Yes, the wall behind the speakers is only painted - doubles as a cinema
screen!

Lack of HF would, I'm sure, be put down to using LPs (if I did each and
every time) and the speakers that were used on different occasions were
my Ruark Paladins a long time ago and more recently the JM-Labs I got
from Rob.

Interesting point. The ear is very adaptable and forgiving. I have a
theory that in the days of vinyl we might have subconsciously filtered
the surface noise and, along with it, any real hf content. There was
the common preference for mellow "tone" rather than hf extension - no
bad thing considering what was likely to be happening in the hf range!

Speaker manufacturers would be delighted to hear that in fact treble
propagated equally in all directions. But I fear it just isn't so.