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Old 17th February 2004, 04:23 PM   #1
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Default measuring frequency response

What would it take to start measuring the frequency response of speaker drivers? I would like to learn how to do this, and start building speakers.. What's involved? Tia
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Old 17th February 2004, 05:27 PM   #2
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Google is your friend.

http://yu-ra.tripod.com/ts_parameter.htm

http://sound.westhost.com/tsp.htm

Also, pick up a copy of The Great Sound Loudspeaker Manual. It has an easy to understand explanation and pictures on how to measure drivers along with some projects.
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Old 17th February 2004, 05:35 PM   #3
claudio is offline claudio  Italy
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Hello,
you will need the hardware and the software to do it, and it will cost you from few euros (depending on what do you already have) to hundreds of . A cheap way is using Speaker Workshop as software and your computer sound card as hardware: check my site to have a better idea; be aware that it isn't a P'n'P solution, you need to spend time to achieve a sufficient knowledge. Expensive (but ready to go) solutions are Clio and MLLSA; with an oscilloscope you can get some measurements too.

Regards

Claudio
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Old 17th February 2004, 06:06 PM   #4
kan3 is offline kan3  United States
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if you have a computer:

behringer ecm8000 mic + preamp with phanton power = $95 US

RTA software - Free for the basic options on some good programs...better options would be the level 3 TrueRTA for $70 US

http://www.trueaudio.com/rta_abt1.htm
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Old 18th February 2004, 02:59 AM   #5
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Check out Eric Wallin's audio page at http://www.gti.net/wallin/audio/audio.html for Speaker workshop tutorials and DIY hardware to make it all work.

Cheers
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Old 18th February 2004, 03:03 AM   #6
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Quote:
pick up a copy of The Great Sound Loudspeaker Manual.
It might help if I get the dang title right. It's the Great Sound Stereo Speaker Manual by David Weems.
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Old 18th February 2004, 03:41 AM   #7
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Timn8ter, thanks for the book title. That looks like it would be something manageable.. Also, (to everyone) is it necessary to measure the frequency response and parameters of a speaker? Many companies seem to supply it, so what exactly is it used for? Does it have to do with building the crossover? Maybe after you design a crossover you do a frequency response test to see how flat the system came out or something?? tia

Dave
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Old 18th February 2004, 07:26 PM   #8
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Quote:
Originally posted by bonsai171
Timn8ter, thanks for the book title. That looks like it would be something manageable.. Also, (to everyone) is it necessary to measure the frequency response and parameters of a speaker? Many companies seem to supply it, so what exactly is it used for? Does it have to do with building the crossover? Maybe after you design a crossover you do a frequency response test to see how flat the system came out or something?? tia

Dave
More reading.
http://www.decware.com/new%20site/mainmenu.htm

Read Steve's article titled "How to Design a Speaker".
Quote:
Once you have the drivers in your hands, and after you've measured the Thiel&Small parameters of at least the woofers, you are ready to start designing a crossover. Now that you can plainly see the discrepancies between the published specs and actual measured specs, you can be glad you haven't built the crossovers yet.
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Old 18th February 2004, 08:29 PM   #9
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Hi,

Would say pick up a copy of Great Sound Stereo Speaker Manual by David Weems first and read it thoroughly. It is really a good book to start with (one of the best IMHO) and also fun to read. It will make a lot of things clear. After then you can decide if you really need to invest in measurement stuff. IMHO measurement is not the first thing you need when you want to DIY loudspeakers.

Cheers


BTW. Weems book comes with CD loaded with free (DOS) design software. However no measurement software.
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