Using the FRC tools I have simulated the response for the Eminence Alpha-8 and APT-80 on a 10x20 baffle, and designed two crossovers: 1st/3rd order, and 2nd/2nd order. Although the frequency response is similar for both I was wondering if there is anybody here who can predict the difference in sound for both designs?

Thx, Thomas

Xover A - 1st order low pass, 3rd order high pass:
http://www.one4ever.de/audio/xoverA.jpg

Frequency response for xover A:
http://www.one4ever.de/audio/xoverA_frd.jpg

Xover B - 2nd order low pass butterworth, 2nd order high pass butterworth:
http://www.one4ever.de/audio/xoverB.jpg

Frequency response for xover B:
http://www.one4ever.de/audio/xoverB_frd.jpg

The Alpha 8 is pretty smooth through the midrange, so it sounds nice in a system with a low-order crossover, or one with no crossover at all. If it had more breakup, you would probably like it better with a higher slope. The tweeter will have increased excursion if run with a lower crossover slope, and this will make it less robust. I think it sounds better with a higher slope anyway. So I think I'd probably lean towards the 1st/3rd solution. You might stagger the crossover points of the two to get summing right.

"You might stagger the crossover points of the two to get summing right...."

Anything that is wrong with my 1/3 xover?

Thanks, Tom