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From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: net.audio
Subject: Re: Need Help w/static and CD noise.
Message-ID: <4103@alice.UUCP>
Date: Sat, 3-Aug-85 09:15:31 EDT
Article-I.D.: alice.4103
Posted: Sat Aug  3 09:15:31 1985
Date-Received: Sun, 4-Aug-85 08:47:36 EDT
References: <10500002@orstcs.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 36

>     2) I purchased a CD player under the asumption that there was
>	low noise/hum... after a while, I realized that there was a lot of
>	hum involved with ANY disk I played (I thought that it was just the
>	recordings that I was listening to).  I went and purchased a new
>	amp, (techniques SA-350), and upgraded other components, even going
>	so far as to get an equalizer.  I still hear noise! Does anyone know
>	if the JVC XL-V1 CD player is just subject to noise, or am I just
>	very unluckey with the CDs I purchase?  (It is noise enough to be
>	VERY audible at a volume setting of 2 or 3).

In general, you should not hear any hum; if you do, something is
probably wrong.  Try to isolate the source:

	1. Disconnect the speakers.  If you still hear it, it is
	mechanical, probably coming from a power transformer in one
	of your components.  (don't laugh! my power amp hums loudly
	enough to hear when no music is playing, the refrigerator
	and furnace aren't running, and you sit near it)

	2. If the hum level stays constand when you change the
	level of the volume control, it's coming from somewhere
	after the volume control.

	3. If you get hum when you select the CD player but no disc
	is playing, the CD player may be at fault or it may be a
	ground loop.  To find out, disconnect one channel.  If the
	hum vanishes on the remaining channel, it's a ground loop.

	4. If you get hum only when you select the CD player AND
	a disc is playing, it's almost surely the player.  Try
	playing, say, the silent band from the Elektra test disc
	("The Digital Domain").  If you hear anything at all, the
	player requires service (but make sure it's not a ground loop).

	5. Oh yes: if you haven't done so, replace your connecting
	cables and make sure that doesn't cure it.