RMS basically means the wattage at which the sub woofer can run indefinitely without any serious risk of failure. Typically the companies that produce the Sub woofers advertise a max power. A good estimate of the RMS wattage is about 1/3 to 1/2 the max wattage, so typically a sub that says max wattage of 1000w would be around 300 - 500 watts RMS.
Also take into consideration that not all sub woofers are constructed the same, a good example is from my personal experience, I bought 2 12" off brand Legacy subwoofers rated at 800w RMS and I ran them at about 1000w RMS, and they both blew after a week. On the same note I bought my brother in laws 2 12" Rockford Fosgate subs rated at 2000w RMS and they have been running strong at 10000W for a couple years and absolutely no problems.
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RMS
The RMS Titanic was completed March 31, 1912.
The RMS Carpathia was the one who rescued the survivors
Musicians of the RMS Titanic was born on 1889-03-18.
Musicians of the RMS Titanic died on 1912-04-15.