Ken Restivo wrote:
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On Mon, May 21, 2007 at 07:45:29PM +0100, Folderol wrote:
On Mon, 21 May 2007 11:10:46 -0700 Ken Restivo <ken@xxxxxxxxxxx>
wrote:
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The M-Audio Audiophile interface produced just as much noise as
the Edirol FA-66 did. However, the amp I borrowed was buzzing
even with only a regular (Korg) keyboard plugged in, so the
problem may have to do with the amp.
I also noticed that this laptop's analog video output produces
some nasty warbling/ghosting on my external monitor. Looks like
rain falling or fog travelling rapidly, especially with dark
screen backgrounds. Dunno if that's an improper X setting, a
problem with the monitor, or or maybe this laptop is just
generating way too much EMI with the Core 2 Duo's 2.33Ghz clock?
I hope that's not the problem-- that is one of the few things I
cannot change.
I've going to buy a keyboard amp, to isolate that variable at
least. Off-topic, perhaps, but any recommendations? Most keyboard
players I've seen recently seem to have Roland wedge-style
keyboard amps. My local store carries the Peavey's (KB4, etc).
Thanks Pieter and others for links about noise mitigation. I'll
try those suggestions too once I get the amp situation squared
away.
- -ken
Have you thought of plugging in nothing except a battery operated
headphone amplifier? With no external earth loops and a high
immunity to EMI pickup this could prove very revealing.
It sounds fine with headphones, and also sounds fine going into my at
home stereo: quiet and lovely.
However, my stereo is *not* grounded: it has only a 2-prong plug.
Likewise, the wall-warts for both the FA-66 and the Audiophile are
not grounded. Maybe I should try to find a grounded wall-wart?
How I wish these things were powered by their USB/Firewire cables!
That wouldn't help (since they are all 2-prong). It's most likely the
laptop PSU that causes the problem.
Pieter
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