Are film capacitors directional?

YES- in the photo; you have the Mundorf outer foil leads connected to the x-over's inputs, which is correct(for a series circuit). Reread point three, of the auriCAP advisory, regarding connection in a x-over circuit.

You owe me a Coke, Al. We must have hit, "enter" simultaneously!

Thanks guys.

R2 = 10W 3.3Ω
R4= 5W 3.9Ω

bc

3.3 and 3.9 ohms seem low enough to be unlikely to change the stated conclusions.

Rodman, I'll make it a beer rather than a Coke. Next time you're in Connecticut!

-- Al

Thanks, Al!!