How do I get to know the impedance of the PC audio? (mb)
alright,i'll explain this the best way that i can.
Your soundcard is made for you to plug-in either headphones or
amplified speakers.Its output is made to handle 4-32 ohm loads.
Sound cards are not really intended for driving out a lot of power.
A typical card is intended to drive a 32 ohm load (headphones) on the
green LineOut jack. The signal level is "line level", which might be
1 volt AC RMS or so of signal. The headphone jack on the front of the
computer, may be tied into that as well, or the front headphone jack
may have its own 32 ohm drive.
*So it's just a matter of impedances how loud the speakers will be?
if you have a 5.1 or 7.1 sound card,the actual output impedance
of some of them, is around 1 ohm.But that doesn't mean you can
use the chip to go further than that.the chip might go into current limiting,
if you attempt to abuse it, and the result would be a heavy dose of
distortion. The 1 ohm output impedance is a small signal
kind of rating, more of academic interest than anything
else. The 32 ohm rating is the one to pay attention to,
as that one is a "full power" rating.
if you're using your speakers directly plugged into your PC audio ouput,
without using any amplifier,then you are using it as "speaker line level"
which is not good.indication is that you're going have some distortion,
noise,HUM and leads to a clipped speaker.
*What do you mean by "speakers clipped" ?
This is when a speaker has reached its maximum output capacity yet tries
to keep up with the input signal gain ratio between the signal source.
runs out of voltage from the supply rails and we get a flat spot at the
upper and lower peaks of the wave form. In an extreme case,
"severe clipping", there is so much additional energy buildup (heat)
into the voice coil(s), but the cone does not move (motivate) enough to
cool the voice coil and former adequately. Hense, the voice coil over
heats and either seizes in the gap or burns the voice coil windings.
RESULT: OPEN CIRCUIT and a blown speaker!
inside a blown speaker,normally,the magnet wires are burnt and the windings
are crumpled and tangled.if it does stay that way while playing music and
your speakers start to clip without noticing,instead of impedance,it will
create
voltage (speakers hate this) that will backfire to your sound chip
and your sound card is done.
But I found that out some time ago, with an input, it would be all too easy.
