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Amplifier voltage

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Analog Kid View Drop Down
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    Posted: 17 Apr 2008 at 4:40pm
If I take a 120 volt amplifier from the U.S. and connect it to a 240 volt output in Australia, is it true it will be about twice as loud?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2008 at 9:35pm

Provided nothing went bang which it surely would, then

Power = rms voltage squared over load impedance

And therefore it would produce four times the power.

However, four times the power is only 6dB(SPL) but you'd need 10dB(SPL) for it to sound twice as loud.

10dB(SPL) equates to 10 times the power  which sounds twice as loud, 20dB(SPL) equates to 100 times the power which sounds twice as loud again, etc.

Power to sound pressure level (SPL) = log10 to base ten of watts multiplied by 10, in dB

SPL to power = antilog to base 10 (dB(SPL)/10), in watts

Complicated isn't it, but the human/energy relationship is a logarithmic one.
Not simple enough for Google-Bot to understand...
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