pro-rabbit 5,000+ posts
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The RMS is the same from 10-18 and the difference from copper to Aluminum is not that drastic. I can say that the HDC will take way more then 1krms. Most of use are runnging 1500-2200 to each, not that I suggest that though.its more like 1500rms for the copper coil and 2000-2500rms for the alumim coil for the 18's, the 15's like 1300rms and the alumim coils like 2200-2400