Why not use a 16 ohm variable Lpad for attenuation ?( for instance one from Parts Express found in the clickable picture link )
- Use in place of all fixed value resistors ( between crossover components and the 802 driver ).





BTW, the N800-D network only offers 4- or 5db maximum of horn attenuation > which typically isn't enough for home listening ( when mated with a 416 type woofer ).

One wants a network that offers more than that . Something like a max. of 8db or 10db of attenuation is more useful .