On Sun, 17 Aug 2014 04:21:09 +0200 Ralf Mardorf <ralf.mard...@alice-dsl.net> wrote:
> On Sat, 2014-08-16 at 20:17 +0200, Dennis Schulmeister wrote: > > On Sat, 16 Aug 2014 18:21:52 +0200 > > Ralf Mardorf <ralf.mard...@alice-dsl.net> wrote: > > > > > Increase the volume and you will hear digital noise from the analog IOs > > > of a card inside of the computer. Move the mouse and extra noise will be > > > audible, no MIDI is needed to get annoying noise. MIDI noise is very > > > silent compared to mouse noise, but there is some noise. > > > > That's exactly the noise I'm talking about. With ground-lift it goes > > away. At least it did for me. > > I'll keep it in mind and test it someday. The idea of a DI-box between > analog out from the sound card and input of the mixing console is > strange, but that's were the problem appears. Parasitic noise might > disappear, but transformers of a DI-box likely will have negative effect > to the sound quality. Is there a DI-box without negative effect to the > sound quality? You get what you pay for. An active DI with quality transformers can easily give a flat 20-20 response at up to +24dBu and with THD better than 0.1 %. I'm getting that at +10dBu with a home build using the the transformer makers recommended schematic, and was quite astonished to be able to reproduce a flat-topped square wave at 100Hz with no visible overshoot. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song. _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev