Dean ,
"The extra extension is nice, but I think the real strength of this driver is on its low end." Exactly ! ! I have been waiting on mine tweeters for almost three weeks when i ordered them . Shipping to the Netherlands is real slow. Anyway , in the mean time i heard everybody talking about cymbals and the high end of this tweeter. But when i heard this tweeter yesterday on Saterday 18 march for the first time ................it was powerful. This means you can cross it earlier ............. i still like the K-400 Okey we have a difference of opinion about the AL-4 and AK-4. It was intend to be for 4500....................? But Dean and All , when you have a network ready for 4500 Hz i will be the first ! When you are a "technical" listener i think you will need a trac-horn with a Beyma. I am a technical listener and know i miss some detail in the K-400. But i like the sound the way it is. Thank you, Ben