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Old 27th August 2011, 04:00 AM   #1
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Default 8 ohms woofer plus 4 ohms tweeter?

Hi: suppose I want to make a speaker with an 8 ohms woofer and a 4 ohms tweeter. Would this be reasonable? That would be all.
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Old 27th August 2011, 04:12 AM   #2
sreten is offline sreten  United Kingdom
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Hi,

You haven't searched at all have you ? It has been done to death.

Lazy, and the poster is best left to properly searching this forum.

rgds, sreten.
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Last edited by sreten; 27th August 2011 at 04:16 AM.
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Old 27th August 2011, 04:40 AM   #3
tinitus is offline tinitus  Europe
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stf92, on behalf of the forum you hereby get an official appology


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Old 27th August 2011, 05:01 AM   #4
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My apologies to you, guys. May my inexperience in audio be to blame. Regards.
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Old 27th August 2011, 05:04 AM   #5
tinitus is offline tinitus  Europe
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well, you can find tons of info by searching

http://www.troelsgravesen.dk/Diy_Lou...r_Projects.htm
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Old 27th August 2011, 05:16 AM   #6
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Quote:
Originally Posted by stf92 View Post
Hi: suppose I want to make a speaker with an 8 ohms woofer and a 4 ohms tweeter. Would this be reasonable? That would be all.
Tell us your reasons, and we'll tell you if it's "reasonable."
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Old 27th August 2011, 05:18 AM   #7
borispm is offline borispm  Hong Kong
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Hi stf92,
There are quite a number of designs that have 8 ohm woofer and 4 ohm tweeters. If your amp can handle 4 ohm loads properly, you're fine.

The impedance fluctuation of dynamic drivers, especially woofers, are quite huge. Some drivers may be rated at 8 ohm but their impedance rises to say 50ohm at high frequency and that's all right. Your mileage may vary but I would say matching a 4 ohm tweeter to an 8 ohm woofer is reasonable.
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Old 27th August 2011, 05:56 AM   #8
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Thanks for your kind reply. The amp will be a TDA7294 integrated circuit. I was just looking for the data sheets I keep in my desk, and do not find them. I'll look at the web.

I think what matters is the amp output impedance vs freq, although I do not think such a curve will be in the data sheets. Well, you've given me the fundamental advice: amp must be able to drive 4 ohms. Thanks a lot.
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Old 27th August 2011, 06:49 AM   #9
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Quote:
Originally Posted by borispm View Post
Hi stf92,
There are quite a number of designs that have 8 ohm woofer and 4 ohm tweeters. If your amp can handle 4 ohm loads properly,
And probably as many with 4 ohm woofer(s) and 8 ohm tweeters.

dave
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Old 27th August 2011, 07:07 AM   #10
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Default A curious statement on circuits, in particular about crossovers.

Hi: This statement refers to a circuit you'll be able to see here. The rightmost branch, that containing C3, I will cut it so we are speaking of the series combination of C2, R3 and VC3. For all I know from circuit analysis, any permutation of those three components, for instance R3, C2, VC3 won't make any difference at any point in the circuit.

But, as is logical, I acknowledge there are people who knows more than I do. Can somebody tell me whether I am wrong?
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