Any one ever change a bass driver on a B&W Sig 800

Why would you want to change the driver? If the surround is old foam it may need new surrounds.

Also you do NOT want to put in any other driver than what was made for that speaker. I won't go into here but you'd be sorry putting in any other driver. You've been warned:)

Warnerwh

There is a slight noise. B&W sent me a pair of new drivers.

Why would you?
Just change speakers.

Couple of ideas for you, John. My drivers are usually still stuck, even after I remove the screws. My way to get them to pop loose is this. I turn an oversized screw, like a sheet metal screw, into one of the holes. Then, with a thick, folded towel, under it, I use a claw hammer to pop the speaker loose so I can get a finger under it. Sounds radical, but it works. Also you need to make sure your new drivers are air-tight, either with a gasket or some sort of sealant. Don't cross the wires, but I'm sure you know that. By the way, do you hear or feel anything when you push the cone in slightly with your fingers?