Bottlehead Forum
General Category => Tech Tools => Topic started by: Jamier on November 19, 2020, 10:47:46 AM
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I want to measure some TS parameters but I don't have an Audio Signal Generator. Will a laptop and an online tone generator suffice, or will this be inaccurate? If it will work, can I take the signal from the headphone jack of the computer or should I put it through a DAC and then to the amplified part of the setup? I intend to use the setup described by Rod Elliot.
Jamie
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I would get a USB tester dedicated to doing this. They aren't all that expensive, and they work really well.
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PB, can you give me a link to an example.
Jamie
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here's one
https://www.parts-express.com/dayton-audio-dats-v3-computer-based-speaker-audio-component-test-system--390-807
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What are TS parameters? ....its probobly obvious but i cant figure it out.
A sound card output is ferectly fine if you just need a line level source to create test tones. Its only when you want to measure a signal coming back that needs dedicated hardware, especially for speaker level signals.
I built one of these which sits between my sound card line input and the device under test http://www.pmillett.com/ATEST.htm (http://www.pmillett.com/ATEST.htm) ...but admitantly its not a cheap solution. An external sound card inferace would be the better bang for your buck.
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Here is another:
http://www.woofertester.com/wt2product.htm (http://www.woofertester.com/wt2product.htm)
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Mark, it's the Thiele-Small speaker parameters. Jay and PB thanks for the links, problem is they require a PC and I have a MAC. By the time I invest in the PC and the DATS or whatever, I'm as much in as If I bought a Clio system, which at this point, might make more sense.
Jamie
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TS parameters = Thiele/Small parameters. See https://en.wikipedia.org/wiki/Thiele/Small_parameters
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I want to measure some TS parameters but I don't have an Audio Signal Generator. Will a laptop and an online tone generator suffice, or will this be inaccurate? If it will work, can I take the signal from the headphone jack of the computer or should I put it through a DAC and then to the amplified part of the setup? I intend to use the setup described by Rod Elliot.
Jamie
It can be done - I did it that way for years. It's fairly labor intensive... :^) I don't know what Rod Elliot's method is, so I can't say if that's the way to do it.
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These USB woofer testing devices will run on ancient Windows machines. If you have an electronics recycler around, I'm sure they have some $100 laptops.
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In the measurement setup described by Rod Elliot, he mentions that is important to have a voltmeter that is accurate when measuring above 1-2 KHz. How will I know if mine isn’t?
Jamie
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In the measurement setup described by Rod Elliot, he mentions that is important to have a voltmeter that is accurate when measuring above 1-2 KHz. How will I know if mine isn’t?
Jamie
Connect your meter to comptuer and use an online tone generator at various frequencies.
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PI, thanks. Now I see that I have a meter that will measure freq. I will check that meter against the tone generator. If they don’t agree at a particular freq. I guess I will have to make a choice as to which one I trust.
Jamie