I'm not sure about cab tuning for the 416a. I'm sure someone will know the correct volume and port size for that setup.
Personally I would use a 800hz or 1200hz crossover point. The 511 horn does not sound good that low to my ears.
Plus the M19/Z19 crossovers are built with MF EQ included. It makes the horn sound much better. IMO it turns a theatre speaker into a HiFi speaker
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