Car Amplifier Question - diyAudio
 Car Amplifier Question
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 Class D Switching Power Amplifiers and Power D/A conversion

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 12th January 2013, 12:21 AM #1 diyAudio Member   Join Date: Mar 2012 Location: Chicago Car Amplifier Question I would test this myself, but I'm dorming at school and wont be back home soon. Do car amplifiers putout ~12 volts to the speaker? I know my rack mount amplifier will putout up to 85 volts for the speaker, wasn't sure what the car amplifiers Vp was. Thanks, Lewis Last edited by abcdmku; 12th January 2013 at 03:09 AM.
 13th January 2013, 03:11 AM #2 diyAudio Member   Join Date: Jul 2007 power = voltage * voltage / resistance ur rack 85 volts into 4 ohm speaker is 85*85/4 watts= 1806.25 watts ur rack 85 volts into 2 ohm speaker is 85*85/4 watts= 3612.5 watts almost all car head units will put 10 volts at the most. coz they use car battery and don't step up the voltage 10*10/4= 25 watts, i see 15-20 rms most of the time, around 20 rms bad distortions car amps depends, they step up power supply 500 rms car amp will pump what volts in 4 ohm speaker 500= voltage * voltage /4 voltage= 44.72volts the same 500rms amp may pump more voltage if the rms is 500 but it can peak 600rms like my sony xm1s car amp does 500watts at 2ohms rms, but 900 watts peak. 500 rms car amp will pump what volts in 2 ohm speaker 500= voltage * voltage /2 voltage= 31.62volts Hope this helps you another thing power = current *current * resistance power = current * voltage voltage= current* resistance

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