Harald Milz wrote:
Does anyone know about a good ALSA compatible tone generator which I could use to find the peaks? My sound card (well, a 24/96 one, ummm ...) and my Sennheiser 580 phones should be able to provide a near-flat frequency response up to about 20 kHz...
Try speaker-test, in MDK that's part of alsa-utils package.
# speaker-test --help
speaker-test 1.0.8
Usage: speaker-test [OPTION]... -h,--help help -D,--device playback device -r,--rate stream rate in Hz -c,--channels count of channels in stream -f,--frequency sine wave frequency in Hz -b,--buffer ring buffer size in us -p,--period period size in us -s,--speaker single speaker test. Values 1=Left or 2=right