Upgrades are a bit tough to recommend as pretty much everything in them can be upgraded so where do you stop? Do you reinforce and seal the cabinets, move the terminals, improve the crossover, install a better horn, a better woofer, improve the porting, the cabinet damping, and still call it an ALTEC Model Nineteen or just start over?
Great speakers stock for what they are, enjoy.
I think "Upgrades"are for Klipschies; they need 'em. But the Model 19 is one of the best all in one box turnkey speakers ever made and is best kept in ideal stock condition--the only work that should be done on them is maintenance needed to keep stock performance.
That's what I think.
