Hi,
I have a 4ohm 3W speaker as shown in the picture above. Is it possible I can convert the 4ohm's to 8ohm using a resistor or something?
It's just the one speaker i'm using.
If so, please can someone explain how it is done. Thank you.
Probably OK to just use the 4Ω, maybe depends, but you could wire them in series for 8Ω (believe it or don't).
PE - Many amplifiers have ratings for 4Ω and 8Ω.
Why? What will be driving it?
at that power you wont feel any difference. it might affect distorsion , power and quality in amplifier but with 3w i dont think is an issue
Its just one speaker i'm using.
Yes, a 4-Ohm resistor in series makes 8-Ohms. But with a resistor you'll get 1/4 of the audio power (assuming the same voltage) into the speaker compared to the 4-Ohm speaker by itself.
What does testing without any addons show?
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Please answer the other questions. They're all important. The sooner you answer questions, the less likely the thread will get sidetracked and you will get a speedier and more useful resolution. Thanks.
The impedance of a speaker changes as the sound goes up and down in pitch (or frequency). For example, at 41 hertz (the lowest note on a standard bass guitar), the impedance of a speaker might be 10 ohms. At 2,000 hertz (the upper range of a violin), the impedance might be just 3 ohms. The impedance specification seen on a speaker is just a rough average.
Some of the more exacting speaker engineers like to even out the impedance of speakers for consistent sound throughout the whole audio range. Just as someone might sand a piece of wood to remove the high ridges of grain, a speaker engineer might use electrical circuitry to flatten the areas of high impedance. This extra attention is why 4-ohm speakers are common in high-end audio but rare in mass-market audio.
What Speaker Impedance Means and Why It Matters (lifewire.com)
You still haven't said what is driving the speaker.
If low power, like an Arduino PWM pin, or a single PNP transistor, then you can use either 4, 8 or even 16-Ohn speakers. You nor the Arduino would see much difference.
If you are planning on the full rated power of the speaker, then the question of what you are driving the speaker with is much more important. Some amplifiers are sensitive to proper impedance matching, others don't care.
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