Re: whats frequency response rating for
Running speakers below about 80hz is never good for them, they arent made to perform like subwoofers. Use them for what theyre made to do. Cross it over to 75hz, and set ur subs high pass filter to 75hz and you'll be set.
I think they rate those speakers in the range that they will efficiently produce a sound. Unless theyre really good midbass speakers, they wont produce enough sound below 80hz to be significant.
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Gearguy2001 (American Bass SQ780)
Tw1st3d13 (2 Fi BL 15's)