Not arguing with the figures, just stating empirical findings. Will see if I can find details of the two machines at some point. Ditched one manufacturer because of poor quality control, so may just have been unlucky.
John Sent from my iPad > On 5 Nov 2013, at 22:41, Fons Adriaensen <f...@linuxaudio.org> wrote: > >> On Tue, Nov 05, 2013 at 10:20:35PM +0000, John Leonard wrote: >> >> Hmm, not what I've found: I mean, really not what I've found. > > No point in discussing basic physics, a self noise of 19 dB(A) > and a sensitivity of 7 mv/Pa amount to -116 dBm(A) at the > input of the preamp. Unless I botched up the the calculations: > > 7 mV = -43.1 dBV = -40.9 dBm > 1 Pa = 94 dB SPL > > 19 - 40.9 - 94 = -115.9 > >> Sorry to disagree, but I've tried a number of systems and have >> found that the low-cost recorders that I've used, un-modded, have >> had unacceptable noise levels when cranked up. > > And what EIN levels do the specs of these recorders state ? > > There may be a different issue at work here. EIN is normally > measured at maximum gain. A well-designed preamp should have > more or less constant EIN for the upper 25..30 dB of the gain > range, but many don't. > > Ciao, > > -- > FA > > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
