Guy King wrote:
> The message >
> from Mike Smith > contains these words:
>
>
>>Not true. Higher-impedance loads are easier to drive for a solid-state
>>amp, not harder.
>
>
> True, but of course as the impedance rises the voltage required to
> attain the same output also rises. Given you've only got a 12v supply
> available things can get a little tricky with 8R speakers.

Modern amps with switching power supplies can "chop" the signal at high
frequency and increase the available voltage. Only relatively low
powered amps use a 12V supply. Think about it; P = V^2/R. If V is 12V,
and R is 2Ohm, the most power you could ever get would be 72W, for 4Ohm
speakers only 36W. Obviously higher supply voltages are being used in
higher-power amps.

--
Mike Smith