i will say this, ive heard multiple hdc3's 10s 12s 15s and 18s and ive heard a few different subs from the SSA line. The 12" xcon, and 12" & 15" icon. First thing i will say is that the icon is more efficent and its alot cleaner bass. The HDC3s get loud but it just seems like there is something missing when listening to them...(some say this about DD subs too) But my choice would go to the icon. There cleaner bass and more enjoyable to listen too for extended periods of time IMO.
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and with good voltage and clean signal it can take upwards of 1500rms