You will need at least a 12DB slope crossover. The 800 Hz is in my opinion a little low for the 811 horn. I would try 1200 Hz @ 12 DB. That would require a cap and coil for each driver. There are calculators on the internet that can get you in the ball park and you may/will need a resistor in the tweeter circuit to balance the sound level as the horn will sound too loud in relation to the woofer. A large quage coil for the woofer circuit will increase the woofer output which is helpfull if using a single ended or low power amp. The cap for the tweeter and the coil for the woofer is where I would spend the most money. The higher crossover frequency will also help protect the horn driver to survive with out incident.
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