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Headphone Amp speaker impedance Answered

The headphone amp I built awhile back is working pretty good, but recently I saw something about matching speakers impedance to the circuits impedance or something like that. IDK. Is there something you have to do to regulate the output to "match" your speakers. A google search brought up something about a peak resonance....

2 Replies

steveastrouk (author)2011-03-02

Impedance matching is only important if you have a high output impedance. If its very low, maximum power transfer occurs.

In amplifier circuits, the output impedance IS very low.


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rickharris (author)2011-03-02

Matching the impedance (the resistance to AC current - more or less) will allow maximum power transfer.

It;s a bit like joining 2 hoses together you get the best water transfer if the hoses are similar sizes.

Many small amps - you don't show your circuit are made to interface with low impedance headphones 4 to 8 ohms is typical.

Your not likely to gain very much if your system is working at present.

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