When reading the RMS output of a mono block car amp does it matter how many subs i have with x amount of Ohms?
I have 4 Alpine 1222d dual 2ohms with rms of 500w each. I also have an Alpine M2000 mono block amp Rms 1400w at 4ohms and Rms 2000w at 2ohms. Does this mean the amp should put out 2000w total to my subs? Are my subs now rated at 2000w Rms at 2ohms instead of 8ohms?
Yes, it matters. The number of subs, the number of voice coils, their individual impedances, and the wiring configuration determines the final impedance that the amp "sees".
To get the full power from that amp and with 4 subs, you really need the DVC 4 ohm models (SWR-1242D). 4 DVC 4 ohm subs can be configured to present a final impedance of 2 ohms. Wiring Option #1:
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=4&woofer_imp=4
4 DVC 2 ohm subs can only be configured for either a 1 ohm load (too low for the amp) or 4 ohms.
The amp is not stable below 2 ohms.
With your combination, you'll be better off to wire the subs for a final impedance of 4 ohms and be satisfied with 1,400 watts RMS (350 watts to each sub). Otherwise, the 1 ohm wiring will cause the amp to draw excessive current, overheat, and eventually fail completely. Wiring Option #2.
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=4&woofer_imp=3
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