I thought the acoustic lens was employed to modify the directionality of the tweeter as it crosses over so low down on the AML-1?

If that's the case, surely taking it away creates the worst example of the problem Thorsten refers to when he chastizes domestic two  ways, namely widely different dispertion patterns at the crossover frequency.

NB. Tenson, according to your measurements, you have also lost a substantial amount of bass by taking the speaker apart. Why would that be?