0
volts x amperes = watts
so
amperes = watts / volts
X amperes = 700 watts / 12 volts
= 58.33 amps
Your amplifier draws 58.33 amps.
This is assuming that your 700 watt number is actually based on power transferred to the speakers and is actually a number more applicable to lights or motors. Power moving through an amplifier changes up/down incredibly rapidly with the volume and frequency of the sound. That means that you may get 700 watts (and 58 amps), but only for a tiny fraction of a second. In addition an honest 700 Watt amplifier may only put 700 Watts through particular low resistance speakers (a 1 ohm or 2 ohm subwoofer for example where common speakers might be be 4 ohms and only receive half the power).
Add that many low end manufacturers are notoriously 'optimistic' about their power levels and you have quite a mess.
What else can I help you with?
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