Hi
The purchase of an ECM8000/Xenon 802 today instantly provided a chance to confirm the accuracy of the various testing devices in my possession.
Using the correct REW cal files my Galaxy 140 so closely matches my ECM8000/preamp combo as to make the latter merely desirable luxuries.
You chaps obviously did a superb job on the cal files and these devices do seem very similar from example to example.
The problems start when I try to compare my old/new RS analogue SPL meters with the above two.
There is obviously some disparity here which is quite probably the result of a simple testing error on my part: I had similar problems in matching the RS curves when I first obtained the Galaxy 140. I have tried both C-weighting and disabled. The ECM8000 and Galaxy 140 both had C-weighting disabled for their tests.
Rather than further damaging my few remaining brain cells it is very likely that you can point straight to the problem.
My old and new RS meters have near identical curves despite there being 10 years in age between them. They do not seem to share the same curves with the other two more expensive devices despite careful loading of the correct cal files for each REW test. Close matching of the position of the various mic capsules [on the tripod at the listening position] was achieved with rubber bands.
Thanks.