Sound-speaker guru needed!

[miiser]

Originally Posted by David C

You won't damage the head unit unless you short the wires. But you can damage low power speakers by sending them too much power. I didn't made a typo when I wrote 10w. I'm not a sound tech, thought I'm an electrician, so when it comes to electrons, I know my business.

Think of your speaker as a light. The more powerful the speaker, the higher voltage it's rated for. So a big speaker will be very bright if you send it enough power, but will appear dim with moderate power (such as the one your head unit can put out), while a medium sized speaker will appear bright, but won't light up much of a room, but it's max voltage isn't less than what your head unit can output. Then a small speaker will just burn out if you send it too much voltage (like trying to send 9v on a 6v light bulb, it will be extremely bright for a short period of time then burn out). Since the speaker have a fixed impedance, when you crank the volume knob, the current stays the same, but the voltage rises. Since power = voltage * current, voltage = current*impedance and current = square root of (power/impedance), you can use those formula to determine the power wire sizing and then to find out how much voltage the head unit can send out to your speakers only by knowing the max power output of the head unit and the speaker impedance.

Use speakers rated with minimum as much power as your head unit can output per channel and you'll be fine. Then to have the optimal effect, try to stay close to that maximum rating, otherwise you'll have to play the music with the volume all the way up all the time, which isn't good for the radio (it's like trying to drive your car on 10" tires, your engine will have to rev like crazy all the time, it'll work, but will shorten it's lifespan quickly).


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Ok it makes sense. Thanks for the explanation. Nice examples.
Did you found any free time to check the links?


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