adamdea;610809 Wrote: > Phil I have a couple of questions about your tests and ADM, if you have > a moment (and by the way hope you get better soon). > Am I right in assuming that the maximum null (ie no change > whatsoever)=100? > If so I am a bit confused about the control difference being 96.96 and > the margin of error being .5 -shouldn't the control difference be > related to the margin of error. What else accounts for the control > measurement being less than 99.5? > Am I right in assuming that the significance of the case 2 difference > is marginal? It seems quite close to the control figure, and I am > intrigued by how much variation there would be if you repeated the > control test at the end. > I am not a scientist or statistician obviously, but had a vague idea > that in scientific test a significant variation was one of which you > are 95% confident that it isn't the result of random variation or other > factors- how do we apply that to this data? > NB As ever I promise that these are genuine questions however daft or > misguided they may appear.
Hi - in brief, no the max null is not 100. The theoretical max null is -144dB if using 24-bit recording. In practice we know that 24-bit is impossible with readily available tech so it's more like -120... in practice, getting a null under 100 is tricky - you won't get that with any old PC soundcard. The purpose of the control test is to set a baseline using prevailing conditions. 90+ is a VERY good null. As I said, some of these differences are small... but they were there. I did repeat each test 10 times. -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... Touch(wired/XP) - Audiolense 3.3/2.0+INGUZ DRC - MF x-dacv3/x-10/x-psu(Audiocom full mods) - Linn 5103 - full Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Pekin Tuner, Townsend Supertweeters, Blue Jeans Belden Digital,Kimber 8TC Speaker & Chord Signature Plus Interconnect cables Stax4070+SRM7/II phones Kitchen Boom, Outdoors: SB Radio, Harmony One remote for everything. ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=84742 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
