First I had the little brother 811B horns. I did not cut the fins because I was happy after damping them. I don't think cutting the fins on a 811 or 511 is an issue. The horns are not so rare that it will decrease the value. If they cut with a good saw, water, laser, plasma arc. You wont even hardly see the kerf.I build boxes that went up to the rear flange. I wanted the ability to change the driver conveniently. If your going to use the same driver you could box the whole rear portion. On the front side the sides of the box came up to the flange but the top and bottom extended past the flange. I would consider this a matter of taste in decorating only. You could damp the lips if the cabinet covered them too.
I pretty much always multi amp this stuff. Almost all compression drivers need compensation when used in a 2way or 3way, and I wouldn't cross a 511 any lower than 750 - 1000 hz IMO
Bill
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