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Multi-Way Conventional loudspeakers with crossovers

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Old 24th March 2007, 11:12 AM   #1
derekyu is offline derekyu  Hong Kong
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Default high pass filter (crossover)

http://www.so-voioe.com/html/sovoioe-en/loudspeaker.htm
so-voioe

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.
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Old 24th March 2007, 11:51 AM   #2
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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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Old 24th March 2007, 01:10 PM   #3
derekyu is offline derekyu  Hong Kong
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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.
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Old 24th March 2007, 07:06 PM   #4
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I can't do in now as I am going to work. I'll do it tomorrow. Ok?
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Old 25th March 2007, 03:23 PM   #5
derekyu is offline derekyu  Hong Kong
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thanks for your help.

The speaker is 8R for woofer and 4R for tweeter
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Old 29th March 2007, 03:56 AM   #6
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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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Old 29th March 2007, 03:16 PM   #7
derekyu is offline derekyu  Hong Kong
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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"
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Old 29th March 2007, 03:53 PM   #8
banana is offline banana  Hong Kong
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Hi Dereky,

This online crossover calculator might help.

http://www.mhsoft.nl/spk_calc.asp#crossover
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Old 30th March 2007, 05:32 PM   #9
derekyu is offline derekyu  Hong Kong
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banana: thanks you for your comments and help.

And

All you too
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