Electronics > Beginners
Changing the impedence of a speaker driver
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Adhith:
Hello everyone,
I,m planing to make use of a  pair of woofers and tweeters lying around in my house. Both are having an impedance of 4 ohms and I believe it creates a net impedance of 2 ohm when connected through a crossover. Since my amplifier could only go down upto 4 ohms, I'm planning to change the impedance of the drivers. I have heard that audio transformers could help to achieve this but I don't know how. Could anyone suggest me a solution?
soldar:
Several thoughts.

Nominal impedance does not mean actual impedance over the whole range.

If you have a proper crossover filter the impedance should not decrease over the whole range.

Depending on your amplifier it probably can handle lower impedance.

A transformer is really not a good way to do it.

It would be better if you can supply more information.
Adhith:
Thank you very much for your reply. By considering the nominal and actual impedance range you meant that it is possible to run this setup? I have actually wired this setup today and it was working. However by raising the volume above 60 percent the amp automatically turned off. I'm assuming that the in build overload protection triggered it. So does that mean if I keep a volume below 60 percent I could safely operated the amp?

If you could specify about what all specs should I give it would be great help
GregDunn:
You're running them in parallel?  That's dangerous at any level.  Not only does that make the nominal impedance seen by the amp 2 ohms (which is probably what's shutting off your amp) but you are likely to destroy the tweeter with the low frequency content of the signal.  Before you run it again, obtain or build a low pass / high pass crossover network and insert it between the amp and the speakers.  As an added benefit, this will make the output in the region where the speakers would overlap quite a bit flatter.
soldar:

--- Quote from: GregDunn on May 11, 2019, 12:54:05 am ---Before you run it again, obtain or build a low pass / high pass crossover network and insert it between the amp and the speakers. 
--- End quote ---

I interpreted his post to mean he was already doing this.
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