I made a CD with the pink noise cited that came with the prog, had to pad it out 1s either side and convert to 44k1 using Audition to get it on the CD. The active part is very short. I then ran this through an Iriver portable CD player and recorded the signal using the Sound Devices 702. I've attached part of the residual. This time no minimum is detectable, though the residual is much lower. The pink noise is not steady noise - a change in tone colour is audible at several points in it and these changes correspond to the spikes, and are curiously repeatable across the channels - the CD source L and R channels are simly duplicated, but the replay and recording are two separate channels. My recording peaks at -33dBFS and the residual is say -76dBFS if you ignore the spikes, -51dBFS if you don't ignore them. System noise is slightly lower than the residual - you can just see the run-in where the noise was padded with silence before.
Being charitable to audiodiffmaker the difference between the same thing repeated is -43dB relative to the original - if the spikes are included the difference is -25dB. I don't think this program is repeatable enough to show what it is supposed to show at all. I don't share the belief that all digital paths sound the same but I *do* think the same digital path will sound the same 10 seconds later. I have some scores in the cable and vibration-sensitive department I was hoping to settle with this (and I'm open to testing digital paths that sound apparently different :) However, as it stands this program isn't cutting it. If it *needs* wordclock synchronised across replay and recording systems then audiodiffmaker really ought to say so in big red letters. Though I can synch the SD to an external source and or send wordclock out of it I don't have have a CD player or squeezebox that can do that so I've reached the end of the road with it. As an independent observer I have *not* been able to replicate the results that program is claimed to show. +-------------------------------------------------------------------+ |Filename: residual.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=3128| +-------------------------------------------------------------------+ -- ermine ------------------------------------------------------------------------ ermine's Profile: http://forums.slimdevices.com/member.php?userid=12613 View this thread: http://forums.slimdevices.com/showthread.php?t=37352 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
