if u had a 300rms sub that was dvc 2ohm and u wired it to 4 ohms
would it be 150rms if so would it be just as loud

 

It would be 150 watts and exactly half as loud, or 3db

Edit for more details...

The sub would be able to receive 300 watts at 4ohm, but it would only get what the amp would give at its 4ohm rating. So get an amp that is rated 300 watts @ 4 ohm and it will be great.

 

if u had a amp that is 300rms at 4ohms and 600rms at 2ohms
would it pull more amps at 2ohms than it would at 4ohms

 

Yes.

V = IR or voltage = current * resistance or volts = amps * ohms

P = IV or power = current * voltage or watts = amps * volts

so since voltage is (somewhat) consistant as the power goes up the current must too.







(These equations are mucho helpfullo when dealing wtih anything electronic)

 

Actually depends on the amplifier.. some ( not many) have a voltage regulator, that keeps the voltage steady no matter what ohm load you are running it at.. however, usually these amps, you do not get nearly as much of a power gain, when running at a lower ohm load. for instance I have a Blade amplifier Its a mono amp.. 175X1 at 8 OHM, 4 OHM, and 2 OHM... Tiny little amp.. NEVER got hot even.. lol always ran it at 2 OHM on 2 4 OHM kicker competition 12's

HD

 

Yes the voltage may remain constant, but to put out more power it will have to pull more power from the alternator