I agree with Shadorne that the problem is most likely in the speakers. It may be caused by the metal cone (about which he knows more than I do), it may be a radiation patten discontinuity in the crossover region (my theory), it may be inadequate crossover design (an easy catch-all category), or it may be all of the above.
Speakers have a harder task than electronics, and there's more that can (and generally does) go wrong there as compared to the rest of the chain.
Duke
Speakers have a harder task than electronics, and there's more that can (and generally does) go wrong there as compared to the rest of the chain.
Duke