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Using drivers of different impedances in a 3-way speaker
Using drivers of different impedances in a 3-way speaker
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Old 16th March 2020, 01:49 PM   #1
tfarrowpasttime is offline tfarrowpasttime
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Cool Using drivers of different impedances in a 3-way speaker

I'm building a 10" 3-way speaker, and I'm pretty green with electronics, so I need help with several questions. I'm using Morel drivers, and while the tweeter & midrange are 8 ohms, the woofer is 6.4 ohms. Is this a problem? Could it damage the amp? Could hooking up just the woofer to test it when the amp says "8-16 Ohms" damage the amp or speaker? Would I need any kind of special crossover, or can I just buy a standard off-the-shelf model?Many thanks for any help y'all can provide.
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Old 16th March 2020, 07:22 PM   #2
russc is offline russc  England
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6.4 ohms is a very precise figure.
Are you building from a kit or a published design?
What kind of amplifier are you using?
What are the drivers?

You would likely need a combination of loud volume & low impedance to fry the amp.
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Old 16th March 2020, 07:33 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Is the 6.4R from your meter reading? If it is, that is not the impedance of the coil. You have measured the DC Resistance, which has little bearing on the impedance and a good quality 3 way crossover will match your 8R loading.
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Old 16th March 2020, 07:44 PM   #4
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by tfarrowpasttime View Post
1. ...while the tweeter & midrange are 8 ohms, the woofer is 6.4 ohms. Is this a problem?
No.
Quote:
Originally Posted by tfarrowpasttime View Post
2. Could it damage the amp?
No.
Quote:
Originally Posted by tfarrowpasttime View Post
3. Could hooking up just the woofer to test it when the amp says "8-16 Ohms" damage the amp or speaker?
No, but use very low signal if it is in the free air. Woofer must be in the appropriate enclosure to be tested at full signal from amplifier.
Quote:
Originally Posted by tfarrowpasttime View Post
4.Would I need any kind of special crossover, or can I just buy a standard off-the-shelf model?
Yes, the crossover mast be tailored to those specific drivers you have. Do not waste your money on off-the-shelf crossover.
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Old 19th March 2020, 02:58 PM   #5
Kay Pirinha is offline Kay Pirinha  Germany
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More precisely, the crossover network needs to be tailored to the drivers' impedances at the crossover frequencies (and to possibly different effciencies, and to notches and peaks in the FR's, and and and...).
Best regards!
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