Looking for box plans

[JBLROCKS]

I'm curious if anyone knows where I can find a plan for a box # C-550, I think it was made by Altec in the early fifties. I think it is a big horn type reflex box for two 15" woofers.

Thanks :wave:

[Hofmannhp]

I'm curious if anyone knows where I can find a plan for a box # C-550, I think it was made by Altec in the early fifties. I think it is a big horn type reflex box for two 15" woofers.
Thanks :wave:

Hi,

I found it in my excel fabrication period list...its no Altec...its JBL and the furneered version of the earlier C55 = the later double scooper also known as the 4520. Plans are available surely from some forum members.
The C550 was inthe JBL catalogs from 1956 to 1962. Ideal with two 2205 woofers.

HP