On May 23, 2011, at 15:05, Richard Ash wrote: > I suspect in fact that the difference in volume in that forum post > explains the change in perceived sound quality completely, human > hearing > being very sensitive to that sort of thing. As to why the volume > doesn't > match, I suspect that one of the playback chains is integer all the > way > and the other is float, with the conversion being not quite right ...
You're probably right, or at least something similar is going on. I primarily use a FireWire audio interface which allows me to loop back the exact digital data that is being sent to the DAC such that I can analyze the data. This comes in very handy for confirmation that a particular piece of software is not altering the data along the way. Now that we have 16-bit, 24-bit, and lossy formats (often resulting in 32-bit samples, although the increased depth is far from increased accuracy) as well as 44.1 kHz, 48 kHz, 96 kHz, and 192 kHz, it becomes even more important to confirm that what we're evaluating out of the DAC is actually what we think. I have certainly had instances where 24-bit FLAC would not play correctly on certain pieces of software, but this sort of error was immediately evidenced by my metering system. In that case, I was not getting 24-bit samples sent to my DAC, and thus all bets are off when trying to evaluate the "quality" of FLAC. A proper system will result in FLAC sounding identical to AIFF or WAV. If you hear a difference, then something is wrong with your system, not with the FLAC format. Brian Willoughby Sound Consulting _______________________________________________ Flac-dev mailing list Flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev