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Peak level @ 0, -0.1, -0.2 or -0.3dBFS?

Out of curiosity what do you guys use as standard?

I know (from listening experience and from a TC Electronic paper) that a lot of consumer CD players will additionally clip the signal beyond 0dBFS when D/A'ing and things are so hot.

In which case I suspect -0.3 instead of 0dBFS doesn't make any difference - probably should be at least -3dB or something..

But in other respects, there could be a difference in 0dBFS or -0.1dBFS peak level, I remember reading something about mp3 conversions generally not liking anything hotter than -0.1 or -0.2 (Bob Katz)?

Most commercial CD's tend to be either 0dBFS or -0.1dBFS (pop/rock/dance) so obviously these facts are mostly ignored in the loudness race (in which I "happily" participate myself).

Comments

anonymous Tue, 02/22/2005 - 08:43

lucidwaves wrote: -0.1db is probably safe if RMS volume isnt too high.

Anything greater than 0.3 and there is potential for intersample overs if you are not using an oversampled 100% brickwall limiter in my experience.

We've measured intersample overs using the L2 as the limiter and this is the number that we observed as safe.

The TC MD4 is a complete, brickwall oversampled limiter, so you can go higher if you like. If you're using the L2, I think it's better to be safe and stay around 0.2 or 0.3.

You can read the TC Electronic paper on this subject here, good read: http://www.tcelectronic.com/media/nielsen_lund_2000_0dbfs_le.pdf

Ammitsboel Tue, 02/22/2005 - 11:20

leonardkravitz wrote: We've measured intersample overs using the L2 as the limiter and this is the number that we observed as safe.

The TC MD4 is a complete, brickwall oversampled limiter, so you can go higher if you like. If you're using the L2, I think it's better to be safe and stay around 0.2 or 0.3.

And have you listened...?
Don't get me wrong, but it often seems like you guys like to match numbers instead of listening?
I good test IMO is to make some test CD's with different levels and play them on a range of diiferent CD players.

The Brickwall meter in the system 6000 is an odd thing IMO. It shows that newer albums has up to +3db output, however this isn't posible and it seems like the meter is "calculating" artificial overs that aren't really there.

iznogood Sat, 02/26/2005 - 09:40

that would be nice.....

i would really like to know a bit more....

after trying the m6000 with ammitsbøl i am wondering about the whole "intersample peaks" thing..... is it just another case of "the emperor's new clothes" ?

by the way..... how would one write a digital word of +3dBFS?????

1111 1111 1111 1121???? :lol:

anonymous Mon, 02/28/2005 - 10:45

Ammitsboel wrote: I good test IMO is to make some test CD's with different levels and play them on a range of diiferent CD players.

Did you read the TC paper? This is almost exactly what they did.

Ammitsboel wrote: The Brickwall meter in the system 6000 is an odd thing IMO. It shows that newer albums has up to +3db output, however this isn't posible and it seems like the meter is "calculating" artificial overs that aren't really there.

iznogood wrote: by the way..... how would one write a digital word of +3dBFS?????

They ARE really there--not just possible, but CERTAIN. It's quite intuitive when you think about it. Here is an excellent paper that will clarify intersample overs:

MKH 800's

iznogood Mon, 02/28/2005 - 11:09

thanks for the link....

i think this paper implies that all system not having oversampled peak meters do not accurately display the peaks.....

that means 98% of all DAW out there!!!

and it also means that if you mix in the analog domain and all of your signals are full code then you essentially have maybe 64 d/a's distorting at the the same time......

my conclusion is..... if this is true almost all digital audio up until now is useless!! :?

by the way .... ammitsbøl tried putting some full code raw waveforms like sine and sawtooth into the TC intersample meter..... they all came out over odBFS!!! :?

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