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From: jabusch@uiucdcsb.Uiuc.ARPA
Newsgroups: net.audio
Subject: Re: CD player hookup question
Message-ID: <5700090@uiucdcsb>
Date: Wed, 17-Jul-85 16:21:00 EDT
Article-I.D.: uiucdcsb.5700090
Posted: Wed Jul 17 16:21:00 1985
Date-Received: Fri, 19-Jul-85 02:19:35 EDT
References: <1061@pucc-i>
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Nf-ID: #R:pucc-i:-106100:uiucdcsb:5700090:000:1523
Nf-From: uiucdcsb.Uiuc.ARPA!jabusch    Jul 17 15:21:00 1985



	I don't think this is what the manufacturers ever intended.  The 
'aux' inputs are for equipment which gives signal levels rivalling those
of open reel decks, cassette decks, tuners, etc.  All of these devices
fint into the same impedence range due to a semi-standardization among
manufacturers.  CD's also fit into this category.  The only difference
between the 'aux' inputs and the 'tape' inputs is the label.  The phono
inputs for your turntable are the really different inputs: entirely dif-
ferent impedence ranges for small signals coming from cartridges or 
moving-coil amps.
	While standard speaker impedence is around 8 ohms, and the same
for headphones, mic jacks are not designed for this type of match.  Most
microphones start out around 600 ohms and go up, and the actual output
impedence of the headphone jacks is relatively low.  I don't have figures
in front of me, but I would assume these to be around 100 ohms or less,
depending on the type of discrete component that is driving the headphone.
	While these are far different, you can get sound with relatively
little distortion through such a connection by adjusting the output
levels for the haedphones and the input levels for the microphones.
However, I wouldn't want to do it.  It never seemed like a good idea to
me.  I would always prefer to use equipment in the manner in which it
designed to be used.  Also, damage resulting from this type of connection
would void any stereo warranty that I know of.

	{ lots of disclaimers }

	John Jabusch