You may also want to consider having someone upgrade the crossover parts for you (someone with experience, measurement equipment, and reputation).
Call Danny Richie @ gr-research.com. Yes, you could DIY it, and yes, you'd have to pay for shipping. However, you'll know they're done correctly, you'll have measurements to prove it, and when you go to sell them you'll be able to say, "Crossovers upgraded by Danny Richie @ GR-Research (work order and receipts included)" rather than "I hacked at the crossovers based on suggestions @ Audiogon to try to make them sound better."
The N805 were my first "high end" speaker and I have a soft-spot for them. I'd hate to see a set butchered.
Call Danny Richie @ gr-research.com. Yes, you could DIY it, and yes, you'd have to pay for shipping. However, you'll know they're done correctly, you'll have measurements to prove it, and when you go to sell them you'll be able to say, "Crossovers upgraded by Danny Richie @ GR-Research (work order and receipts included)" rather than "I hacked at the crossovers based on suggestions @ Audiogon to try to make them sound better."
The N805 were my first "high end" speaker and I have a soft-spot for them. I'd hate to see a set butchered.