On 11/03/2015 13:59, Jim Lesurf wrote:

FWIW I checked the 'pink' and 'white' noise bands on a variety of test LPs.
They were all wildly different in ways that didn't simply mimic the
response of the cartridge I was using.

The best way I found to do measurements of frequency response was to use a
stepped or swept tone test band from a test disc.

http://www.audiomisc.co.uk/HFN/LP4/NewLampsForOld.html

shows some examples using the Analog Productions test LP.



The HFN test record I got doesn't have stepped tones, just a rather fast
10 Hz to 20 kHz non-linear sweep. This results in a 'tilted' 10
dB/decade spectral response curve like the pink noise test.

BTW the variety of FR results in your article was interesting and put my
own results into some context.