DYI upgrading B&W N805 to Diamond 805?

Good advice to get an upgrade done professionally. 

I would definitely upgrade the tweeter caps, and there's also a potential there to upgrade the N805 to "Signature" 805, which includes the higher spec aluminium dome tweeter.

So long as you have the right uF and don't go down in voltage ratings, replacing caps is pretty simple and safe and can be beneficial.

As I've mentioned, if you want to go with the B&W sound, stick with Mundorf and Mundorf SIO.  Look around on the Internet and you'll see that's what B&W is putting into their top speakers.

There's at least one pair of B&W speakers that were identical except for the tweeter cap. The high end used Mundorf, low end some generic.  I'm sorry I don't remember the exact models, but bookshelves.

I am re-opening this, as I am stuck at home and I'd like to take this on to upgrade the cross-over.

Could ANYONE recommend WHICH Caps, resistors are suitable for the upgrade that DO FIT on the board, and also improve sound being newer and better components.

Mundorf MKP.

Inexpensive (relatively) and quite compact. It's also B&W's mid-range cap brand.