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From: firstname.lastname@example.org (Ben Bradley)
Subject: Re: So what's the problem with just connecting the speakers from the computer into the home sound center?
Date: 29 Oct 2002 15:37:14 -0800
References: <email@example.com> <3DBD94A6.DC012870@gv.net>
NNTP-Posting-Date: 29 Oct 2002 23:37:14 GMT
In sci.electronics.design, John Woodgate
>I read in sci.electronics.design that Michael R. Kesti
>wrote (in <3DBD94A6.DC012870@gv.net>) about 'So what's the problem
>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
>>One should not use a sound card's speaker outputs to make this
>>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-
I agree that impedance is not the issue, but I'd much rather use
the "line out" than "speaker out" or "headphone out". The power amp on
a soundcard is chosen with low cost as a higher priority than low
distortion. Even if the difference is imperceptible (and admittedly
for many soundcards, stereos and listeners it will be), the signal
going through less electronics has to be better, and choosing line out
over speaker out costs nothing.
Some soundcards I've seen (that only have one output jack) have a
couple of jumpers on the board to switch the output jack between line
out and speaker out.
Let's not even talk about the soundcard's "mic in"...
>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
>(unlikely) from a bridge-tied load output stage (like an H-bridge,
>non-audio chums), there would be a problem. Solved by taking the
>from one output terminal and the earthy/ground side of the input.
>Regards, John Woodgate, OOO - Own Opinions Only.
>Interested in professional sound reinforcement and distribution? Then
>PLEASE do NOT copy news posts to me by E-MAIL!
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