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Old May 23rd 18, 07:05 AM posted to microsoft.public.windowsxp.general
Paul[_32_]
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Posts: 11,873
Default O.T. Speakers static/humming

Mark Twain wrote:
The Harman Kardon set-up is 2.1 with (2)
stereo speakers and a base(Sub).

The model number is HK695-01

The speaker plug is in the same APC surge arrest.

http://www.apc.com/shop/us/en/produc...r=SEC-756-GOO-[53166061159]-[269259981065]-S-[]

As I say, this is an intermittent problem
that comes and goes. Most of the time
everything is fine.

Robert


What a weird design :-)

I've never seen anything like this before.

https://www.top4runners.com/computer...on%20HK695.pdf

It accepts what is effectively quadraphonic input (two front,
two surround signals) and does a transform of sorts to 2.1
or maybe even a sort of 3.0 .

*******

One neat feature, is the interface has a diagnostic output
jack, that sweeps low frequencies and gives you a test
stimulus for the speakers (PDF page 17). So you don't even need
a Sony Walkman or a tape recorder, to inject a test
sound to test the speakers.

The test tone sweeps from 40Hz to 400Hz. The crossover
on the sub is at 180Hz. Frequencies above 180Hz, you would
expect those to go to the satellite speakers.

This also means, the input signals hardly go directly
to the amplifiers inside the unit. The input signals
would go to the DSP chip. The DSP chip would process
the signals and drive the amplifiers from there.
As I don't know of a way to convert 4.0 to 2.1, using
only RLC circuits from an Electronics 100 course :-)

Google let me down, in terms of theory of operation
or any of that sort of stuff. No take-apart
pictures to see what is inside.

The design is a good deal more complicated than
your average computer speaker, at a guess.

Paul
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