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Old 23rd August 2008, 10:43 PM   #1
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Default Please help with crossover

Hi,

The crossover frequency in my DIY speakers is calculated at 3000hz but still I can hear lots of sounds coming out from the tweeter that are supposed to be below the 3000 Hz range (according to charts like this one http://www.soundinstitute.com/images/tt58f2.gif ), like alto and even tenor sax or human voices. Isn't it there something wrong?? or this is normal and I should not use those charts as a reference.

Many thanks

Antonio
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Old 23rd August 2008, 10:52 PM   #2
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How about you tell use more info like what slope you have used, and circuit diagram.
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Old 23rd August 2008, 11:04 PM   #3
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Hi,

This is the circuit diagram: http://www.diyaudio.com/forums/attac...amp=1150796093

My aim is just to copy it. At the moment I am using slightly different resistors values because I could not find the exact ones yet but I suppose this should not be the problem. I am using 3.3 ohms for R2 y 8.2 ohms for R1 instead of 3 and 8 ohms.


Antonio
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Old 24th August 2008, 11:48 AM   #4
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that chart gives fundamental tones, but tweeters mostly reproduce overtones...
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Old 24th August 2008, 11:53 AM   #5
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Are you using the same drivers as in the diagram?
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Old 24th August 2008, 12:28 PM   #6
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Hi Thanks for your replies.

Quote:
Originally posted by PeteMcK
that chart gives fundamental tones, but tweeters mostly reproduce overtones...
This makes sense.

Also now that I learned about cutoff and slopes it makes even more sense to hear a voice or a tenor sax sound coming out from the tweeter.

Quote:
Originally posted by richie00boy
Are you using the same drivers as in the diagram?
Yes, I am using exactly the same drivers.

By the way the designer (Jim Griffin) said in another thread that the slope is high order (I do not how high) and that the design incorporates BSC.

Thanks

Antonio
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Old 24th August 2008, 12:47 PM   #7
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Well remember that the filter is not a brick wall and that even 10dB down sounds could be audible.
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Old 24th August 2008, 12:52 PM   #8
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Yes, you are right thanks.

I was a bit concerned because I did not what to blow up the ribbon tweeters.

I have checked that the crossover connections are correct, so everything should be fine.

Regards


Antonio
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Old 24th August 2008, 01:00 PM   #9
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My tweeters are playing the top of voices too
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Old 24th August 2008, 01:51 PM   #10
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Maybe you need to play just a little with both attenuation resistors ?
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