> >> There is no sound out from the TV tuner card or AV card. That's why Apple
>>> has the 1/8" minijack on the motherboard.
>>
> > Right. Oops. Those are definitely under two watts. You'll need an amp.
Most definitely!
Typical loudspeakers come in 4, 8 or 16 ohm varieties.
Typical unbalanced line level, ie, the audio out on your computer,
the playback jacks on your cassette deck are in the 47,000 to 100,000
ohm range.
An 8 watt amplifier will deliver 8 volts at 1 amp into an 8 ohm speaker.
A line level output typically peaks at 100 millivolts. (1/10 volt)
The current available, since it's designed to feed a 50,000 ohm load
is almost nill.
The long and the short of it... You could hook loudspeakers
directly to the audio out jack on your computer & *probably* (no
guarantees) won't hurt anything. But! you'd have to turn off your fan
motors, hard drives, etc. & put your ear up to the speaker to hear
anything at all. And, it would sound very tinny. (bass notes require
significant amounts of current)
Cheers,
Andrew
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