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.

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.

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

:cop:
moderation

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

well, you can find tons of info by searching

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

Tell us your reasons, and we'll tell you if it's "reasonable."

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.

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.

And probably as many with 4 ohm woofer(s) and 8 ohm tweeters.

dave

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?