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doris

Building an audio amplifier for 2.5 ohm speakers

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Hello!  
I am trying to dug out of my box o' stuff a pair of seemingly decent 2.5ohm bookshelf speakers recently. I wired them to an old mp3 player I have and while they sound good at low volumes, I get lots of distortion at high volume. Given that they are only 2.5ohm, I'm assuming that this is because they are trying to draw more current than the poor mp3 player can produce. 
Rather than buying one (or new speakers for that matter), I'd like to try and build an amplifier for these speakers. I was looking at using an IC such as the TDA7294  but like all of these chips, the advised load impedance is 4 ohms. It doesn't specifically state anywhere that the absolute minimum is 4-8 ohms, but has anyone had any experience with this sort of thing? Will it still work at a lower load impedance if I just make sure that the volume is limited? If not, will I be able to use this IC if I chuck a big 2 ohm power resistor in series (as much of a waste of electricity as that is)? 
I'll probably get some anyway to play with but I am a poor student and I would prefer not to blow up several $12 chips. 
Any advice or suggest will be great helpful ! Thanks a lot !

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My advice is don't waste your time and money trying to build a one-off amp for an oddball set of speakers. 

 

There is nothing wrong with being a poor student, we were all there at one time in our lives.  The secret to having good stuff when you only have a little is NOT in how to save money, but in knowing how to wisely SPEND your money.

 

 

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3 hours ago, wvu80 said:

My advice is don't waste your time and money trying to build a one-off amp for an oddball set of speakers. 

 

There is nothing wrong with being a poor student, we were all there at one time in our lives.  The secret to having good stuff when you only have a little is NOT in how to save money, but in knowing how to wisely SPEND your money.

 

 

Excellent advice.  Save up for something decent, not expensive and be happy!.  This will also give you more time to study.:)  Welcome to the forum and pick peoples brain.

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Doris, Welcome to the forum....

2.5 ohm speakers? How do you know that? And yes you can increase their impedance by adding a resistor in series and wasting power as you stated.

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