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Old 3rd March 2006, 09:27 AM   #1
diyAudio Member
Join Date: Nov 2004
Location: Vancouver B.C. Canada
Question 3 way xover help

Hey all,

I guess that I will try this again... Nobody seemed to want to reply to my last post.

Hi + Loudspeaker design - omnisat style?

Maybe I will be more specific.

I am looking for help designing a passive xover for a few drivers. They are all MB Quart drivers and I can't help much for the t/s parameters for them, I can just give you the resistances of the drivers and the x-over points that I would like to have them at. I tried searching the forum and found a few different sites and examples to use, but I would like some help if possible.

I have 2x 4ohm (3.5 measured with meter) 6.5" drivers that are mounted isobarically and wired in series to give me an 8 ohm (7ohm measured) bass section (downward firing) and I have an 8ohm (aluminum dome mid) and a 6ohm tweet for this system that I need a xover design for. I would like to have the xover points to be ~500hz and ~3200hz respectively. I did manage to find a spec sheet and frequency responce graph for the mid, if that helps.

Here is the specs that I have for the mid. They are in german, but I think it is understandable (the numbers anyways)

* Frequenzbereich nach DIN: 250- 10000 Hz

* Belastbarkeit: 100 W mit 12-dB-Weiche bei 850Hz

* Mittl. Kennschalldruck (1W, 1m): 90 dB * Resonanzfrequenz: 500Hz

I am planning on having the bass drivers fire downward and the mid and tweet fire in an omnipolar way. I am not sure what the result will be yet, just something that I am playing with. I hope that someone can give me a bit of help on the xover. This is where I am getting lost. Thanks.
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Chris Nicholls
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Old 3rd March 2006, 09:29 AM   #2
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Join Date: Nov 2004
Location: Vancouver B.C. Canada
one more graph for the mid...
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Chris Nicholls
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Old 3rd March 2006, 12:38 PM   #3
diyAudio Member
Join Date: Aug 2004
Location: Italy
Maybe you ask "too much".....
I have a friend that he do not believe at measurements and sophisticated simulation. He simply calculate theorical x-overs on 8 ohms load and so on. Incredible mystery but , sometimes, his speakers do not sucks!! He adjust a bit by ears and voilą, the speaker is made!
Joke apart, I suggest you caution and a 1000Hz 12dB octave
for the mid, 3500-4000Hz for the tw.
If you can, check the speaker's impedance curve (for amplifier's safety!).
MB quart was great domes.

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