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The power handling stated is the electrical power handling, how much power the driver can take without frying. The mechanical power handling is related to the Xmax and Xmech. Usually the Xmax is used to derive this. A speaker with 10000 Watts of powerhandling and 1 mm Xmax is about as useful as a 1 W speaker with 10000 mm Xmax. More expensive drivers will therefore have both increased Xmax and power handling.
i must say im a little confused. i had assumed that a 500W speaker should be powered by a 500W amp, excuse my if that seems a novice statement but really im a bit lost
Cubo Extended has the exact same outer dinmensions as Cubo Standard. The difference is that it has a panel added at the beginning of the horn, extending the horn path and making the chamber a bit smaller. From the outside it's not possible to tell the difference between Cubo Standard and Extended (as the horn path is extended).
i took a look at the extended version of cubo 15. is it simply 15cm deeper than the normal version? means the horn mouth is longer and the chamber volume a bit bigger?
i've six achenbach sub 15. do you think it's worth the upgrade and build six cubo15's instead?