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From: John Woodgate
Subject: So what's the problem with just connecting the speakers from the computer into the home sound center?
Date: Mon, 28 Oct 2002 22:06:31 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 28 Oct 2002 22:31:43 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Michael R. Kesti
wrote (in <3DBD94A6.DC012870@gv.net>) about 'So what's the problem with
just connecting the speakers from the computer into the home sound
center?', on Mon, 28 Oct 2002:
>A problem I detect with this thread is contained in the subject line.
>One should not use a sound card's speaker outputs to make this connection.
>Line outputs are a far better choice as they are more likely to be
>compatible in terms of impedance and signal level.
Impedance is not an issue! Loudspeaker outputs are the ideal low-
impedance source. There would be a signal level incompatibility IF there
were no volume control on the sound card, but one can easily set the
volume control so that the signal sits around 500 mV long-term r.m.s.
value (peaking occasionally up to 2.8V peak). It's a non-problem
PROVIDED the output has one side ground-referenced. If the output were
(unlikely) from a bridge-tied load output stage (like an H-bridge, for
non-audio chums), there would be a problem. Solved by taking the signal
from one output terminal and the earthy/ground side of the input.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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