On mine, I put 16 Ohm resistors on the squawker, changed autoformer to lower efficiency a bit in the mids, added dowel to box to stiffen, put plumbers putty on outside of the horn and woofer basket, added stuffing to inside of box and built the P-trap for the squawker.
I think that covers everything I've done to the old 1975 Heresy's. They sound MUCH better then when I found them.

Dave :^)

• My Site