He suggested the SA line as it matches up better against the SDC line.
Also, the idea that all AQ subs "like higher tuning" is in no way true or even close to it. It is not even true for the HDC3/4 unless your going for numbers and then it is true for every sub on the market.
when compared to a fi ssd? not saying they dont perform well at low tunings but when tuned a few hz higher than the normal they tend to get alot louder. take a sd2.5 ten and tune it to 36hz then bump up to 38hz the difference is just stupid
As for the last comment about power. That will depend on the person and their setup. However, under powering a driver will never harm it.