Current draw on battery, possibly glowshift gauges?

[pennyracer]

when my car sits for a week without driving the battery is dead completely no ignition lights or click when key is turned on yes i am running dual amps and other things how do i test the draw at the battery i did not think the newer amps used power when the car is shut off ? am i wrong i run arc audio amps not cheap shit but maybe they are drawing down my power ? i have a optima yellow top now but i still want to track my voltage draw problem i leave town for weeks at a time and store my car in a building and i should not have to leave it on a charger at all just to keep a charge in the battery please help me someone