Well if you want to use the N500 crossovers then you will have to use a 500 Hz horn.Like a 805,1005,1505 you don't want to use a adapter like the 21216 going from large format into a 1" throat.Yes it could ruin your response but more importantly your diaphragms.If you used a small format driver with that adapter to a large format horn that's OK.You can get creative and get a 511B turn it into a 511E but you need a good aluminum welder for that because you have to cut the throat down to 1.4" and re-weld the mounting flange.You need to get your horns first before you know what crossovers and such you will be using.Bill had a couple pairs of them that were done like that they just needed to be damped.This is what they looked like.
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