The best thing to do is measure the THD after the filter is applied. John's tests didn't include this plus he wasn't measuring a line of several ribbons.
I think adding a 7" also will create some complications...as is the two rows of 3" will provide nice horizontal dispersion. If you have some good size amps you can always boost the hivi's some to get your xover lower, but the nice thing about the peerless subs is they are very clean even up to above 150hz.
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