Editing Audio power (section)

=== Example ===
An amplifier under test can drive a sinusoidal signal with a peak amplitude of 6 V (driven by a 12 V battery). When connected to an 8 [[ohm]] loudspeaker this would deliver:
:<math>P_\mathrm{avg} = {(6~\mathrm{V})^2 \over 2(8~\Omega)}\,\ = 2.25~\mathrm{W}</math>

In most actual car systems, the amplifiers are connected in a [[bridge-tied load]] configuration, and speaker impedances are no higher than 4 Ω.  High-power car amplifiers use a DC-to-DC converter to generate a higher supply voltage.