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If I wired two 4-ohm 12's to 2 ohms into channel 5 on my 5-channel, is the rms of the speakers different? For example...if the sub runs 250rms at 4 ohms, but I wire it into 2 ohms, do i lose, gain or maintain the same rms??? I need some assistance as I'm tryin to decide on what subs to purchase. I'm looking for 2-10's or 12's that would be running off my fifth channel, rated at 500rms.
 

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Changing the impedance of your subs will usually change the output of the amp, not the power handling of the subs.

If your 5th channel is rated 500 rms at 2 ohms, then you will need two 4 ohm speakers that handle at least 250 rms each. You can usually get away with around 200 rms per sub, depending on the quality of the amp.

List the amp you're using and your budget for subs, and somebody can probably suggest a good match for you.
 

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You would have a combined RMS for both subs, but that really doesn't help because you already knew that. Do some searching for subwoofer power handling and enclosure vs power.
 
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