That's incorrect, well in some areas... Firstly they are dual 6ohm subs. So if you basically wire all V/C's back to the amp you will get a 1.5 ohm load. This will be totally fine to run this amp at this load. What you may find is it may have thermal protection that might shut down the amp when or if it heats up with trying to drive it into clipping. I'd say if anything the rated RMS wont change much with loading it at 1.5 (box impedance rise should alter this and increase in 99% of the time the load the amp sees anyhow).
To be fair these subs will handle 1200 wrms (basically their V/C's thermal handling threshold) and your only feeding 420 wrms and about 400wrms is turned into heat at the V/C and 20wrms is actually used to make music (Pretending/saying/guessing the sub is 5% efficient (this is not to be confused with the SPL efficiency of the sub usually taken at 1w1m).
Now if you were to push the amp into 20% distortion/clipping it should sound horrid and easy to hear the distortion. This will give you about 500 watts with about 80 watts of clipped power. As that 80 watts will be nearly turned into 100% heat at the V/C it still is only 480 watts turned into heat at the V/C and is way within the heat capability of the thermal capabilities of these subs. There's no way these coils should burn. You are more likely to destroy (due to constantly over driving the amp) the amp before the subs or cause the amps to send something nasty like 12 volts DC to your subs when your amp blows up...
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