Bang & Olufsen Redline 60 speaker repair plate

thingiverse

I bought a set of Bang & Olufsen Redline 60 speakers (The earlier 6503 model). They had a very common problem where the bass radiator plate had foam rotted into oblivion and rattled around inside the speaker instead of radiating anything. B&O knew it was a problem and in the next revision of the speakers changed from having a radiator plate to having a more common bass reflex port. They even sold a retrofit kit for quite awhile. However these speakers are now ~35yrs old. no more parts. Too bad. So sad. gotta fix it myself. I reproduced the outline of the plate in FreeCAD, and added a hole appropriate for a 1.5" 90deg pvc pipe elbow. I also sketched a "filler" plate to extend into the gap between the plate and the front of the speaker. (NOTE: early versions of this thing were missing some holes, and the bottom right mount pocket was misaligned)