Searched...

Where are the plans for the 4520 Rearloded 2x15" Horn ?
Searched for about 1 hour in the net.
Found a plan in german aol, but missing some details.
Missing position of two and more "baffle deflektions"(?).

http://img100.imageshack.us/img100/7...ll012zu.th.jpg

http://img383.imageshack.us/img383/6...ll021sg.th.jpg

Hope you see there are some missing positions of the inner parts to place them correct. Part with 372, 441, 191 and 254mm length and others. the positions of the brace parts are not included.
Will build this enclosure for my four 2205A drivers.

Eckhard

Nobody knows ??
:(

Ok, found it in LH/ Library/ JBL Library/ Reference/ Technical/ Importance of speaker efficiency:applaud: