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The surface of my fiberglass horns is quite rough. The mould was sprayed from a distance with some water based paint - so it all landed in fine globules. Maybe this is too fine a rough texture though. I like the idea of thick artists oil paint…

One more variable: The meeting of the driver to the horn throat seems very critical. I think I previously had a leak on one side. . . .and the centering of the driver seems to be very critical too. If I place a small piece of absorbent foam right after the driver, these problems disappear, but that is no fix, as then the sound loses dynamic quality. How do you all mate your drivers to the horn? Just a rubber gasket? I now understand why those screw threads were so popular.

I need to do more research, but I'm pretty sure that the foam filling has a different effect from that of the rough horn texture. For example I've now been quite shocked at the sound of live applause. There is now 'wetness' to the texture, and the sound seems to ‘hang’ all around the room.

As to those horrible BMS's, its all I've got at the moment, I’d love to have some other 2'’s to compare one day... But why care if their problems can be successfully controlled by this foam?!

Question, can you tell me what difference open foam has on a 'good' driver in a rough horn?

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