2ohm Power less than 4ohm?

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Hey guys, i was thinking about running a dual 12 inch sub setup in my car and I was looking around for an amp and found the Pioneer GM-D8604. It seems like it will do the job nicely except for one downside.

The rated RMS power at 4 ohm is 300 watts per channel, but it says at a 2 ohm load, it is 150 watts per channel.

Correct me if I am mistaken but shouldn't the 2 ohm load be able to push out more power? The other amps that push 300w at 4 ohm usually can do 400-600w RMS at 2 ohm

What gives? :/

Here is the manual for reference: http://www.pioneerelectronics.com/StaticFiles/Manuals/Car/GM-D8604_OwnersManual100112.pdf
 
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