Originally Posted by exm
Great post, thanks!
So my subwoofer (KEF PSW4000 - awesome sub) with a single 12" driver will outperform my speakers which have two 10" internal bass drivers per speaker
In general I agree with your position, but why I on earth can the former top Reference model of Kef not adequately cover frequencies of 45 (or 50) and above? Why bother buying a top of the line speaker anyway if that's the case?
Depends what you mean by "adequately". At lower levels, they'll be fine, but when asked to play at say -15db and up to reference, they simply can't be asked to perform at their "118db max" rating across the range.
As for your sub, think of it this way, all you're asking it to do is handle below 80hz well, nothing else, and it has it's own dedicated amplifier for this. It also is in a much larger enclosure for the single 12" woofer to work its magic. Whereas your speakers (even with dual 10" woofers) need to handle a much, much larger band, in a smaller enclosure occupied by several other drivers.
Freeing up your mains from sub 80hz duties "frees" them up to do what they do best.