Is analog & vinyl anoying? Is it worht it.

El, it is super that you take the time to do your own tests; my hat is off to you. Actually the link does not asses recorded signal into the noise floor, but points out that the noise floor has, by far, the greatest component below 500HZ and measures dynamic range of 96db or so above that cutoff to the top of the noise floor. Not bad for a rock slamming around a plastic racetrack really.

BTW does anyone know what the carrier frequency was for CD4 recorded LPs; certainly that had to be reliably reproduced.

Viridian...I agree that it is astonishing that a mechanical media like a vinyl LP can sound so good. With some dynamic equalization (instead of the fixed RIAA curve) it can be as quiet as a CD, and with reduced distortion. (This was the DBX LP system, which I once had).

I believe that the CD4 system used a carrier with frequency modulation above 20 KHz. Because it was FM an undistorted waveform was not necessary. It was intended that the rear channels have full bandwidth capability (20 to 20K) so the cartridge had to work up to 40 KHz. In fact, although CD4 was a flop, phono cartridge design was greatly improved as a result of CD4.

I think that the carrier signal was at 44K Hz, but certainly above 40K. That of course forced cartridges to track at much higher than previously.
The response, however, wasn't necessarily flat to 44K and many carttridges achieved the higher frquency response by designing them to 'ring' at the carrier signal frequency.

salut, Bob p.

Gonna take delivery on new cd player. Don't need preamp. What's a good cleaning method for cd's?

What's a good cleaning method for cd's?
Gregadd (Threads | Answers)

I recently heard an A/B demonstration of Shine-Ola, and I was very impressed. ~$30/bottle.

I decided to try some eyeglass cleaner from our optometrist that we had in the house, and I was satisfied that it was effective as well.