At Sat, 27 Oct 2012 16:18:43 +0800, James Harkins wrote: > Has anyone else had this problem? For some pieces using live mic input, I wanted to reduce latency > by pulling the Jack IO buffer size down to 512 samples from the default 1024. (I also tried 256 > samples, but that just made Jack crash.) > > But with the smaller buffer, the mic gets an additional 30-40 dB of gain, making the input > unusable. If I turn the preamp on the fast track down very very low and speak quietly into the > mic, the sound comes through without obvious distortion or glitches, so it doesn't seem to be an > xrun thing. But it distorts very easily and very badly. > > If I switch back to 1024 samples, the problem disappears. Just reconfirming this issue -- with 512 samples in the hardware buffer, the noise floor was about -20 dB. At 1024 samples, it was -70 dB. Baffled (and, I guess, resigned to 46.4 ms latency in my concert...), hjh -- James Harkins /// dewdrop world jamshark70@xxxxxxxxxxxxxxxxx http://www.dewdrop-world.net "Come said the Muse, Sing me a song no poet has yet chanted, Sing me the universal." -- Whitman blog: http://www.dewdrop-world.net/words audio clips: http://www.dewdrop-world.net/audio more audio: http://soundcloud.com/dewdrop_world/tracks _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
