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RE: Loudness - SACD versus CD

Posted by Thorsten (M) on July 13, 2015 at 07:03:37

In Reply to: RE: Loudness - SACD versus CD posted by Tony Lauck on July 13, 2015 at 06:45:06:

Hi,

> This deals with the part that you can as a DAC designer, but
> it requires that the two files have to match "0 dB" in both
> formats.

That is a job for the Testtone generator in Weiss Saracon.

But it is not so simple.

Because SACD goes above "0dB" some masters go into this headroom. So you need to in effect scale 0dBDSD to equal 0dBFS to cure the loudness problem and after that you need to allow for an extra 6dB headroom over and above 0dBFS.

As long as you are running on USB or Battery power for smallish more or less portable devices this can get difficult, as you need >4V RMS on a single ended connection and then the customer has some stupid Amp/Preamp with an electronic volume control that runs on +/-5V and hence once you give them the > 4V RMS it will clip their system.

One could of course attenuate PCM by 6dB, but then if customers compare your DAC to ones with standard levels many will claim the lower output DAC lacks dynamics and so on.

So, not so simple.

Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

This post is made possible by the generous support of people like you and our sponsors:

Kimber Kable

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