Please help with crossover

A Sanchez · 23rd August 2008, 09:43 PM

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

richie00boy · 23rd August 2008, 09:52 PM

How about you tell use more info like what slope you have used, and circuit diagram.

A Sanchez · 23rd August 2008, 10:04 PM

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

PeteMcK · 24th August 2008, 10:48 AM

that chart gives fundamental tones, but tweeters mostly reproduce overtones...

richie00boy · 24th August 2008, 10:53 AM

Are you using the same drivers as in the diagram?

A Sanchez · 24th August 2008, 11:28 AM

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

richie00boy · 24th August 2008, 11:47 AM

Well remember that the filter is not a brick wall and that even 10dB down sounds could be audible.

A Sanchez · 24th August 2008, 11:52 AM

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

tinitus · 24th August 2008, 12:00 PM

My tweeters are playing the top of voices too

tinitus · 24th August 2008, 12:51 PM

Maybe you need to play just a little with both attenuation resistors ?

23rd August 2008, 09:43 PM	#1
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	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

23rd August 2008, 09:52 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	How about you tell use more info like what slope you have used, and circuit diagram. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

24th August 2008, 10:48 AM	#4
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	that chart gives fundamental tones, but tweeters mostly reproduce overtones... __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

24th August 2008, 10:53 AM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Are you using the same drivers as in the diagram? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

24th August 2008, 11:47 AM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Well remember that the filter is not a brick wall and that even 10dB down sounds could be audible. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


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23rd August 2008, 10:04 PM	#3
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	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

24th August 2008, 11:52 AM	#8
A Sanchez diyAudio Member Join Date: Jan 2008 Location: Brooklyn, NY	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

24th August 2008, 12:00 PM	#9
tinitus diyAudio Moderator Join Date: Nov 2005	My tweeters are playing the top of voices too

24th August 2008, 12:51 PM	#10
tinitus diyAudio Moderator Join Date: Nov 2005	Maybe you need to play just a little with both attenuation resistors ?

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