Re: front panel sound
- From: nospam@xxxxxxxxxx (Paul)
- Date: Mon, 08 May 2006 04:17:02 GMT
In article <HOw7g.936053$x96.746497@attbi_s72>, "Randy Davis"
<dean@xxxxxxxxxxxxxxxx> wrote:
Well, if that is true, then I am unable to use the front. Based upon what
you are telling me, when I hook up the front jacks the sound from the rear
jacks should be dead. It isn't. It still works When I plug in my headphone
or speakers to the front jack I get no sound from either the rear jacks or
the front jacks. Obviously, I should get sound from one or the other.
Randy Davis
<grumpy@xxxxxxxxxxxxxx> wrote in message
news:4hrq529lij7gtt3lilf5o890atacdb0fmv@xxxxxxxxxx
On Sun, 07 May 2006 00:51:14 GMT, "Randy Davis" <dean@xxxxxxxxxxxxxxxx>
wrote:
I have the a8n5x. I have sound through my regular speakers, but I wanted
to
connect a front panel sound for headphones and mic. I have pulled the
jumpers from the motherboard and plugged my front panel connectors in.
Sound
plays from regular speakers and when I plug headphones in it stops but I
cannot hear it in the headphones. Is there something else I should set or
do?
From memory you can use the front OR rear connectors but not both.
On the ALC850, the Front_Out and the Surround_Out, have a 20 ohm,
50 mW amplifier on them. (If the amplifier is enabled, that is
strong enough to drive headphones.) The Amplifier in each case can
be enabled or disabled. If the Amplifier is disabled, the output
impedance increases to greater than 600 ohms, which is weaker.
A 20 ohm output, can drive a 32 ohm headset.
A 600 ohm output, will be squashed by a 32 ohm headset.
To get full signal level, the output impedance of the driver has
to be lower than the load impedance.
Amplified speakers have an input impedance of 10000 ohms, and
draw virtually no current at all from the audio connection.
If you connect a 32 ohm headset, and a 10000 ohm amplified speaker
input in parallel, the result is slightly less than 32 ohms, which
will still squash a 600 ohm output.
So, the question in your case is, are the amplifiers inside the
ALC850 enabled or disabled ? Telling the software that you
have headphones connected, is probably the only evidence of
an amplifier in the software interface.
Your front panel wiring is probably connecting BLINE_OUT_R to
Line_Out_R and to the headphone jack in the front of the case.
With that wiring, both the front and rear ports will be
wired in parallel. If you plug headphones in the front, and
amplified speakers in the back, both are operating in parallel.
If the Amplifier in the ALC850 is disabled, the loading of the
headphones squashes the signal. If you can manage to get the
Amplifier enabled, the ALC850 should be able to drive the
headphones and the amplified speakers at the same time.
If you are attempting to use un-amplified speakers, the 4 or
8 ohm loading of un-amplified speakers is too much for that
kind of chip.
In the Realtek Audio Control Panel, tell the software that
you have headphones connected to the Line_out, and in
theory, the software should turn the amplifier on for
Line_out. Line_out is the green connector.
Paul
.
- References:
- front panel sound
- From: Randy Davis
- Re: front panel sound
- From: grumpy
- Re: front panel sound
- From: Randy Davis
- front panel sound
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