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Old 4th October 2012, 07:54 AM   #31
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If I'm not reading wrong the QC date, you have some 3 years old drivers, at least the tweeters.
If the woofers are also "old" I'd "massage" them with a 20-40Hz tone at full x-max for some hours. Let them cool and re-measure.
Another suggestion: I use Arta, and I found that the system gives me more realistic TS parameters when I limit the range from 20 to 100 Hz or something like that.
Ralf
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Old 4th October 2012, 08:30 AM   #32
imagios is offline imagios  Czech Republic
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The driver are old models but I took the first time out of the box, they are new ordered from the shop in september.
Migh te that they are not "broken in" so it may put a different measurement, but definitely
the Vas is impossible, so it must be the measurement.
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Old 4th October 2012, 08:59 AM   #33
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I use this method: Jig for Arta
The jig is pretty easy to build, and the Arta can be used in the free version, so IMHO it is worth a try. If the results are consistent between Arta and WT then the problem is in the drivers.
Ralf
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Old 4th October 2012, 11:20 AM   #34
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All TangBand speakers I ever measured are way different from the specs. Usually actual Qt and Fs are considerably higher, and Vas lower than specified. TB is not the only manufacturer where this is the case, but they are one of the worst as far as my experience goes. It's tricky.
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Old 4th October 2012, 11:59 AM   #35
imagios is offline imagios  Czech Republic
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hmm the question is as well how reliable this dayton audio test is, I used the added mas method with a tape, I cant imagine such a difference, I mean Vas=36lit. ist just not possible for a 5inch speaker, with a Xmax of 3,3mm, there must be a measurement error.
I resimulated the box with my measurement, but with the Vas of TB datasheet, and I will continue as planed, in the most worst case, I just seal the box, and start a new project for a subwoofer.
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Old 8th October 2012, 07:31 AM   #36
flaevor is offline flaevor  United States
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how much weight did you add? my understanding is that if you used too much that could be the source of the error.
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Old 9th October 2012, 08:26 PM   #37
imagios is offline imagios  Czech Republic
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Quote:
Originally Posted by flaevor View Post
how much weight did you add? my understanding is that if you used too much that could be the source of the error.
9,9grams
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Old 9th October 2012, 08:39 PM   #38
imagios is offline imagios  Czech Republic
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Ok gents,
here is the new progress, the plates for the housing are ready:
http://hex.dan.sweb.cz/TBBookshelf/20121009_193556.jpg

I as well measured the tweeters:
http://hex.dan.sweb.cz/TBBookshelf/tweeter.bmp

the exact inner volume now is:12,769 l
that gives a vent of 3,5cm x 10 cm, air velocity still OK for 10W input. turning freq. 43Hz

now comes the tricky part, and I will need help with that I need help as most probably most newbies... the cross over.
I mean I know inductors take the low Freq. cap. the high but thats it...
First of all how many level will I need? just one for the cross over freq. between the tweeter and midbass, or shut I use first a highpass to cut off very low freq.?
What freq. would you recoment to get the thweeter working he has a free air res. below 750hz, but the midwoofer goes nice till 5kHz. It seems like a lot of room to select.
Should I as well lowpass the thweeter above lets say 30kHz?
Or would be just one simple cross over betwen midbass and tweeter be the best approach?
Can someone please advice, as I will not be able to do that on my own.
Many thanks upfront
Daniel
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Old 10th October 2012, 06:14 PM   #39
imagios is offline imagios  Czech Republic
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OK since no one gave any answer, here is what I have so far,
I would select the cross over freq. at 2500Hz after reading some review on the tweeter
that means a first order BW low pass for the midbass = inductor 0.684 mH (2.512Hz at 10.79 Ohm;6db/octv)
Now the high pass of the tweeter the second order BW=8.376 uF + 0.479 mH (2512Hz 5.347Ohm; 12db/octv.)
would this be correct???
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Old 11th October 2012, 06:43 AM   #40
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Textbook equations will not get you a good sounding speaker.

Later,
Wolf
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