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MultiWay Conventional loudspeakers with crossovers 

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24th March 2007, 11:12 AM  #1 
diyAudio Member

high pass filter (crossover)
http://www.sovoioe.com/html/sovoioeen/loudspeaker.htm
sovoioe I would like to introduce this web site for everyone who like coxial speaker. I got a pair of 4" speaker. Its sound quite good and the brass is wonderful. Still under testing. I am now finding a equation for 6db attenuatence by using a simple RC method. Would someone help me? I would like working for 1.5k Hz crossover. 
24th March 2007, 11:51 AM  #2 
diyAudio Member
Join Date: Feb 2004
Location: Queensland Australia

It will dpend on what the impedence of your speaker is. They are usually either 8ohms or 4 ohms. If they are 8 ohms then you should use a 0.8 mH inductor in series with the woofer and about 13uF capacitor in series with the tweeter. If the speaker is 4ohms then you halve the inductor (i.e. 0.4mH) and double the capcitor, (i.e. 26uF)
That is if you want a 6db (first order) cross over. I am not sure that this is your request because you mention RC. Am I right or not? Yours, Jonathan.
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"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse. 
24th March 2007, 01:10 PM  #3 
diyAudio Member

thanks for your working, Jonathan.
I am sorry I dont mention the speaker's value. i am now using 0.63mh in series with the woofer. and trying some caps in parrell to incrrease the value in series with the tweeter. Now the caps are about 9 uf in all. Jonathan, can u state the equation for LP and HP? Any different equation for 3db and 6 db? I got one : f=1/(2 pi R C) Finally, million thanks. 
24th March 2007, 07:06 PM  #4 
diyAudio Member
Join Date: Feb 2004
Location: Queensland Australia

I can't do in now as I am going to work. I'll do it tomorrow. Ok?
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"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse. 
25th March 2007, 03:23 PM  #5 
diyAudio Member

thanks for your help.
The speaker is 8R for woofer and 4R for tweeter 
29th March 2007, 03:56 AM  #6 
diyAudio Member
Join Date: Feb 2004
Location: Queensland Australia

Hi Derek, sorry for the delay. For a first order cross over the inductance L is as follows L=R/2 pi f where R is the impedance of the speaker in ohms and f is the cross over frequency. C is as follows C=1/2 pi R. That is for first order only. I just got these from a catalogue. I think you would find some really good information if you put "speaker cross overs" in Google. There are good sites that will give you a lot more data. Is that possible for you? Jonathan
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"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse. 
29th March 2007, 03:16 PM  #7 
diyAudio Member

hi, Jonathan, you help me much indeed. I am looking for the crossover because I want to make more fun for that concentric loudseaker. I have a pair of 4" and really like it much for its natural sound.
I wanta to order a pair of 15" if i find more fun in 4" 
29th March 2007, 03:53 PM  #8 
diyAudio Member
Join Date: Feb 2003
Location: Hong Kong


30th March 2007, 05:32 PM  #9 
diyAudio Member

banana: thanks you for your comments and help.
And All you too 
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