I'm having a really weird issue with my studio setup, and wanted to see if anyone has any idea what may be going on here.
I have a Roland RP401R digital piano which I have going directly into my Alesis Multimix4 interface with a stereo cable going from the line out of the piano to the left and right in on my multimix. When I do this, I'm noticing that only when powered on, if I put my ear right up to the top of the piano near the music stand, I can hear a very noticeable hum. I'm not sure if it's 60HZ, but it's definitely there. I don't hear it through my speakers though, and it's not bleeding into any recordings. I dono if this is just natural Johnson-Nyquist noise, or what, but I can tell you this: a.. I don't hear it when the piano is powered off. b.. I don't hear it through headphones, line out, nor internal speakers c.. I only hear it faintly when putting my ear up to the piano, but it's definitely there. d.. Turning off the Multimix4 has no baring. e.. Turning all levels on all channels to minus infinity doesn't help. f.. The hum is equal pitch to the lowest B flat on a standard piano. g.. Disconnecting all cables running to/from the piano doesn't help. h.. Unplugging the electrical from the multi-mix isn't helping. i.. The piano is not in a serge protector nor a power strip, it's straight in the wall and has a 2 prong transformer. j.. All cords are snugged and connected well. k.. Finally, I didn't have this issue when I first got the piano about a year and a half ago, and turning the volume on the piano itself up or down isn't effecting it. I'm almost wonderring if we've got a ground loop going on here. Anyone have any ideas? I've also switched out my cables just in case there was a short, but there absolutely isn't, as that didn't help either. One more thing is, my piano is only about 2 and a half feet from my computer monitor. Could it be that monitor amitting RF noise which somehow the piano is amplifying? I'd like to figure this out, as this is becoming rather irritating. I just don't want the piano all a sudden electically to go kuh boom! Yes, I'm using the original power cord for everything, so we don't have improper vultage etc. going on. And, nothing's smoken, so... LOL! Chris. -- You received this message because you are subscribed to the Google Groups "Pro Tools Accessibility" group. To unsubscribe from this group and stop receiving emails from it, send an email to ptaccess+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
