8 ohms woofer plus 4 ohms tweeter?

stf92 · 27th August 2011, 04:00 AM

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.

sreten · 04:16 AM

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.

tinitus · 27th August 2011, 04:40 AM

stf92, on behalf of the forum you hereby get an official appology

moderation

stf92 · 27th August 2011, 05:01 AM

My apologies to you, guys. May my inexperience in audio be to blame. Regards.

tinitus · 27th August 2011, 05:04 AM

well, you can find tons of info by searching

http://www.troelsgravesen.dk/Diy_Lou...r_Projects.htm

Andersonix · 27th August 2011, 05:16 AM

Quote:

Originally Posted by stf92

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."

borispm · 27th August 2011, 05:18 AM

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.

stf92 · 27th August 2011, 05:56 AM

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.

planet10 · 27th August 2011, 06:49 AM

Quote:

Originally Posted by borispm

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

stf92 · 27th August 2011, 07:07 AM

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?

27th August 2011, 04:00 AM	#1
stf92 diyAudio Member Join Date: Aug 2011	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.

27th August 2011, 04:12 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	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. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow Last edited by sreten; 27th August 2011 at 04:16 AM.

27th August 2011, 07:07 AM	#10
stf92 diyAudio Member Join Date: Aug 2011	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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27th August 2011, 04:40 AM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	stf92, on behalf of the forum you hereby get an official appology moderation

27th August 2011, 05:01 AM	#4
stf92 diyAudio Member Join Date: Aug 2011	My apologies to you, guys. May my inexperience in audio be to blame. Regards.

27th August 2011, 05:04 AM	#5
tinitus diyAudio Moderator Join Date: Nov 2005	well, you can find tons of info by searching http://www.troelsgravesen.dk/Diy_Lou...r_Projects.htm

27th August 2011, 05:18 AM	#7
borispm diyAudio Member Join Date: May 2010 Blog Entries: 1	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.

27th August 2011, 05:56 AM	#8
stf92 diyAudio Member Join Date: Aug 2011	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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