Nice Andy! At the risk of pointing out the obvious... this is NOT supposed to have a gross tonal effect like cranking up the treble.
What we're talking about is near fS/2 and above. See the first charts on pages 11 and 12 of the ak4396 data sheet. I believe this this is an FIR that is applied to the internally upsampled stream, which is something like DSD data. Slow filter specifies -3dB at 18.2kHz whereas sharp is -6dB at 22kHz. So in either case it's bat country and a well mastered 44.1KHz track would have been rolled off properly in analog land before the ADC (to prevent aliasing) so there should be nothing there. Same thing applies for other sample rates, just double the cutoff frequencies. Honestly I'm not sure what one should expect to hear in either case and it would depend very much on the recording having any content up there. I vaguely remember talking to AKM about this years ago but I just can't remember what the deal was exactly. Certainly if they had told me slow filter is awesome I would have used it. -- seanadams ------------------------------------------------------------------------ seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=76763 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
