I have no experience with the 904 Duplex in these so one of the whippersnappers here will have to join in.
I have been told that it's a 604 with 421 cone. Anyway, the 421 was an excellent mid-bass. So this could be an excellent set to implement subs with. Prolly need diaphrangus change. Yer on yer own from here. But for 800 clams...
CL link at very bottom.
70s Altec Lansing speakers









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