If you measure the speaker wire terminals of a Class-D Amplifier that has 1,100w RMS, the voltage going to the speakers is 40v (should be 27 amps to get 1,100w). Why is that?
Wouldn't 14v and 78 amps (same wattage) to the subs cause more thump, or is it only the wattage to the speakers that matter (regardless of volt/amp ratio)? Its a 1 ohm setup.
Why does a car audio amplifier put out 40 volts to the subwoofer instead of 12 or 14v?
2016-12-09 5:43 pm
回答 (4)
2016-12-09 5:59 pm
✔ 最佳答案
Hi so yes it would be likely that a higher voltage is used as most now use switch mode power supplies in order to achieve these high value outputs. so this s how they manage the high power outputs.
參考: As an electronics and telecommunications engineer these techniques are used extensively these days.
2016-12-10 3:23 am
It's an amplifier, that's why.
2016-12-09 10:26 pm
p = I E.
To boost power - I, E or both must be boosted.
In a car it's actually current that we make most use of. It's a lot easier to make power using high current when there's a ~100A alternator and ~500A battery to draw from. That has driven the move to low impedance amps -- like 1 and 1/2 ohm sub amps.
In a house we only have 15A on a typical circuit, but we have ~120v so we use high impedance speakers and drive them with high voltage amps.
To boost power - I, E or both must be boosted.
In a car it's actually current that we make most use of. It's a lot easier to make power using high current when there's a ~100A alternator and ~500A battery to draw from. That has driven the move to low impedance amps -- like 1 and 1/2 ohm sub amps.
In a house we only have 15A on a typical circuit, but we have ~120v so we use high impedance speakers and drive them with high voltage amps.
2016-12-09 6:34 pm
Abaha
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