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Old 30th June 2004, 05:56 PM   #1
hazardu is offline hazardu  Romania
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Join Date: Jun 2004
Location: constanta
Default Need HELP with Eurotec sub

After consulting my "financial" advisor i decided i can buy either a Boschman V-10DF or a Eurotec 5189 or 5188 subwoofer.The problem is that i don't have the Theile-Small parameters for the Eurotecs so, i can't make a decision.Can you help me find those???
With the Boschamann i calculated de box volume for about 224 liters for a Qtc of 0.7 in a sealed box.So i need the rest to compare de results.
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Old 2nd July 2004, 07:52 AM   #2
hazardu is offline hazardu  Romania
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HELLO?????anybody plsssss HELP me!!!!!
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Old 2nd July 2004, 10:01 AM   #3
Wizard of Kelts
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I wish I could. Unfortunately, someone else here asked about a Eurotec model, and all I could come across on the internet was this sketchy info from a couple of Eastern European dealers-no Thiele-Small parameters at all.

If you have a voltmeter and either a sound card with either
A) an output of 1 watt or more that can go directly to speakers,

or

B) a hookup from the soundcard to the amp,

you can measure the parameters yourself.
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Old 2nd July 2004, 10:15 AM   #4
hazardu is offline hazardu  Romania
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Join Date: Jun 2004
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unfortunately i don't have a True RMS Meter, and the only ones to be found here are Flukes (100$), and that's a little expensive for my pocket.i have a meter, but not a true RMS one.

I know the drill with Theile-Small parameters, but i don't have the tools)
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Old 2nd July 2004, 10:25 AM   #5
Wizard of Kelts
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You do not need a true RMS meter to measure Thiele-Small parameters, just a voltmeter and an ohmmeter.
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Old 2nd July 2004, 10:27 AM   #6
hazardu is offline hazardu  Romania
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Join Date: Jun 2004
Location: constanta
10x a lot!!!i didn't knew that.Is the "drill" on the www.bcae1.com allright??or you could give me another web page to look for?
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Old 2nd July 2004, 11:38 AM   #7
Wizard of Kelts
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It looks pretty good so far. I don't have the ime to check it completely now-have to go to work, (it's morning here in Connnecticut, USA). Buty it looks about right.

A couple of hints.

First, you might want to download Speaker Workshop, which is freeware. It takes some time to learn, but it measures so much that many people use it. You have to order a special mic capsule from the USA-cheap but delivery might take awhile-but it seems to be a worthwhile investment. Many members use Speaker Workshop to measure Thiele-small parameters, along with frequency response when they are done. But you do not have to use Speaker Workshop to measure the parameters. There are other ways.

Second, if you have a Soundblster or other good soundcard, the Speaker Output of the soundcard can eliminate the amplifier. Of course, you can use the amp anyway, if you want. However, if you use an old receiver fo the amp, remember to set tone controls to flat and set any rumble filters or hiss filters to "off". Most receivers have these-beware of them.

Third. As a double check, do you have an old analog, or dial-type meter? Sometimes they come in handy, and I always like to double check my measurements. They are frequently available for cheap, as people get rid of them in favor of the digital meter. Personally, I like to use both digital and analog meters when working on anything.

Fourth. Here is an excellent online signal generator, freeware. It is written ba fellow named David Taylor, and he puts it on his family's web page, which is nice.

www.satsignal.net => Audio Tools
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Old 2nd July 2004, 11:42 AM   #8
Wizard of Kelts
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PS:

Break in the woofer before measuring. Just run the tine generator at 20 Hz until you see the cone moving somewhat, then let it continue in 10 hours or overnight. That will loosen up the suspension and help you get an accurate reading.
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