> From: Sam Burrish <[EMAIL PROTECTED]>
> Reply-To: <[EMAIL PROTECTED]> (Vintage Macs)
> Date: Mon, 13 Aug 2001 22:43:25 -0500
> To: <[EMAIL PROTECTED]> (Vintage Macs)
> Subject: Re: External Speakers
>
>
>>> I used to have some stereo speakers that actually had an RCA jack built into
>>> each one. Pretty strange. I tried hooking them directly into the sound out
>>> of a computer (with a headphone jack to RCA cable), but there wasn't enough
>>> power to drive the speakers at a useful volume.
>
>> Probably the result of impedance mismatch. Are the audio-out ports
>> generally 4 ohm or 8 ohm ? Anybody ?
>
> I'm guessing either way you have to go through some sort of stereo deck or
> pre-amp.
>
> ?
>
The power requirements of most stereo speakers, meaning speakers that are
meant to be hooked to a stereo and not a computer, are such that you
probably would need a considerably higher wattage amp to drive them.
However, hooking a 4 ohm audio out from a computer (if in fact that is the
rating, which I don't know) to an 8 ohm set of speakers or an 8 ohm audio
in on a stereo system, would result in a fairly severe (50%) loss of signal.
Once this happens, the size of the amplifier is a moot point. The amp would
do what amps do, amplify both the signal and the surrounding atmospheric
noise. Less signal is replaced by more noise. Both would get louder in
tandem, no matter how big the amp is. It all comes down to signal-to-noise
ratio (given sufficient wattage to drive the speaker in question).
Amplifiers tend to be noisy themselves (they create more noise), which
worsens the ratio.
MJF
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