QUOTE(eofor @ Oct 7 2006, 11:27)

QUOTE(cliveb @ Oct 7 2006, 10:13)

Remember that those replay gain values are computed *after* normalization. In other words, the LP transfers peak at 0dB (in fact, to -0.1dB, as that's the way I normalize my LP transfers). Given that, the replay gain value is a pretty accurate measure of the dynamic range. So this demonstrates the fact that LPs typically have *more* dynamic range than CDs. How ironic, given that the CD medium itself is capable of far more dynamic range than vinyl - it just doesn't get used.
Not necessarily - you make two assumptions here:
- there's no significant distortion in the LP signal in the loud parts
- there's no significant noise in the quieter parts
I'm not making any such assumption. Indeed, I am the first to acknowledge that LPs have both significant distortion *and* significant noise.
QUOTE(eofor @ Oct 7 2006, 11:27)

One of these might be true, but both generally do not hold for vinyl: if the peaks are not very high, the signal is "clean" up to the peaks. But the quiet parts are then drowned in surface noise, rumble, and what have you. Normalizing just raises the noise floor with it - you get nice looking gain values but terrible S/N.
What is the connection between a high noise floor and low ReplayGain values? Increasing the noise floor *decreases* dynamic range, so if anything it would result in slightly *bigger* ReplayGain values.
QUOTE(eofor @ Oct 7 2006, 11:27)

If the peaks are high, then the music is distorted way before the actual peak value - you're then normalizing to a distorted signal.
And a distorted signal sounds *louder* than a clean one. But as far as I am aware, ReplayGain is not able to take account of distortion when calculating the perceived loudness, so I don't see the relevance.
The bottom line is that ReplayGain values are a good indication of perceived loudness. If something has a larger negative ReplayGain value, it means that it sounds louder. So if an LP has a smaller negative ReplayGain value, that means it isn't as loud. And if that ReplayGain value was calculated *after* normalization, it means that the difference between the peaks and the quiet bits is bigger, ie. there is more dynamic range.
Look, I'm not here to argue that LPs sound better than CDs. I happen to think the opposite is generally true. I merely questioned the suggestion that it's only major label CDs that get additional compression applied to them. (I refer you back to the fairly high ReplayGain values I measured on two recent non-mainstream releases, ie. the Refugee and Rick Wakeman CDs I mentioned earlier).
You *might* argue that a modest amount of compression over and above that found on LPs is actually a good thing, and that if only it were possible to do it on an LP, it should be. That would be a fair point worth debating.