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#131213 - 04/19/03 03:27 AM Computer Speakers Problem
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
I've got some speakers on my computer,
that when I play some music through them, I can hear a sort of clicking or a "tapping"-like sound over the top of the music, this normally happens during peaks in the music.
Is it the speakers doing this, or is it the signal coming from the sound card?.
I haven't got a pair of headphones or another set of speakers, to see what is causing it.
Any ideas?.
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#131214 - 04/19/03 10:30 AM Re: Computer Speakers Problem
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Trumpy — A cheap set of headphones would allow you to "split the systems in half" and effectively eliminate the speaker/amplifiers or the sound card as a source of problems.

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#131215 - 04/19/03 02:26 PM Re: Computer Speakers Problem
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Does the noise disappear when you turn down the volume control, and thus reduce the level of the peaks? Is it only on one of the speakers or both?

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#131216 - 04/19/03 03:56 PM Re: Computer Speakers Problem
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Paul,
It's still there, regardless of how the volume control is set.
Just wondered if it wasn't the speaker cones
vibrating, the speakers are pretty cheap, they were just an "add-on" when I bought the computer.
It affects both speakers, too, BTW.
There is a website URL on one of the speakers, may go and have a look at that.
It's also got a CE mark on it, this may be the problem!.
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#131217 - 04/20/03 09:19 AM Re: Computer Speakers Problem
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
O.K., I was thinking that if it only happened on peaks when the volume was turned up, it could be a power supply problem (e.g. bad filter capacitor).

I didn't think to ask before, but has this just started, or have these units always sounded that way? Some of the stuff on the market these days is pretty low quality.

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#131218 - 04/24/03 04:47 PM Re: Computer Speakers Problem
kale Offline
Member

Registered: 11/08/02
Posts: 168
I don't know what operating system you're using, but it could be the software. In Win 3.1 you could adjust the sound buffer size to take care of that problem, not sure about more current systems.

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#131219 - 04/24/03 09:57 PM Re: Computer Speakers Problem
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
kale,
I'm using Windows XP, but I have never heard of this sort of thing happening before.
I think it may be the really cheap set of speakers that came with the computer when I bought it.
I'm not sure what "sort" of sound card I've got though, must check.
Also, can anyone tell me what the output impedance of a sound card is?, is it 8 ohms or is it something different?.
I am looking at building a proper amp and speakers, with better bass and midrange response, anyone know of any good kits for this?.
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#131220 - 04/25/03 03:00 AM Re: Computer Speakers Problem
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Trumpy,
The speakers themselves may well be in the region of 8 ohms, but don't forget that these computer "speakers" contain their own built-in amplifier. The output on the sound card is just a normal line-level audio signal.

For kits, have you tried Jaycar Electronics?
www.jaycar.com.au

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#131221 - 04/25/03 06:28 AM Re: Computer Speakers Problem
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Paul,
What I meant was, I was wondering if there was a standard output impedance for sound cards, sort of like a figure not to go under with a series-parallel network as in a set of speakers and the odd cross-over.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

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#131222 - 05/05/03 12:28 AM Re: Computer Speakers Problem
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Paul,
My search has come up with nothing of any real results.
I might have a go at designing and building my own amp and speakers.
I thought about basing the amp on a pair of LM 3876 Amplifier IC's and taking it from there.
I have already bought the speakers and components for the cross-overs.
Just have to work out the circuit for the amp.
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