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I found this schematic and it says the speaker used is 5W and 8Ω. However, the speaker I have is a 5W and 3.2Ω. Will it work? What are the conditions? And what would be the effects?

And if it's okay, I want to modify this to work in stereo because I have two of these speakers. How will I do it?

5w class-a amplifier schematic

Ground
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    If you want stereo, you need two amplifiers, each feeding one of your two speakers. – Peter Bennett Sep 21 '18 at 23:07
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    The vast majority of amps, including this one, tightly control voltage and let the current do what it does, as dictated by the speaker. So if you were to drive the intended speaker to the design limit, and then swap for your lower-impedance speaker, it would pull more current (V=IR) than the amp was meant for. It *might* survive, but that's nowhere near guaranteed. It would certainly run hotter. Limiting the output to far less than its technical capability may let you get away with this kind of mismatch, but in a fully-engineered system, it's far better to actually satisfy all the specs. – AaronD Sep 22 '18 at 04:36
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    Half the voltage. If you drive a 4 ohm speaker at 12v is like driving a 8 ohm speaker at 24V – Passerby Sep 22 '18 at 04:49

1 Answers1

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You can add a resistor in series with your speaker. The resistor needs to be 4.8 ohm and can handle power dissipation of at least 3W.

Refer to this question below: Increasing resistance on speakers

Zy Gan
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