On 27/07/2020 21:44, Clive Arthur wrote:
On 27/07/2020 20:47, wrote:
On Monday, 27 July 2020 17:49:50 UTC+1, The Natural PhilosopherÂ* wrote:

When they first cut disks, amplitude of signal = amplitude on disk. A
crystal or ceramic cartridge reproduced that with no equalisation. Whgen
moving coal and moving magnet came a long, voltage was proportional to
speed, so they need lots of bass boost - at 6dB per octave.For some
reason they then decided to put a bit less on the disk and a bit more in
the amp, and the infamous RIAA curve was borne.

The RIAA curve was a tweak to keep bass excursion on the disc down &
improve hiss/scratch reduction. It increased rumble, but decks by then
were good enough on that point.

I dunno what you mean by moving coal.
Moving coil..


https://www.youtube.com/watch?v=us-PnNyKhCY



--
Climate Change: Socialism wearing a lab coat.