I'm a bit late to this party, but I've got some experience with renovating the Large (well - any of the early Kloss designed) Advents. A word of 'note', maybe even 'caution': do try and salvage the original cloth. It is an integral part of the design, if you are going for "what Mr. Kloss intended". Due to the nature of that tweeter - and I'll assume you've got the original 'dual dome' on the masonite board, mounted at a 45 deg angle - he used two layers of cloth, holes offset slightly, attenuate some frequencies. There is a later tweeter that is a bit smoother in response, but still uses the dual layer grill (IIRC). This is wildy contradictory of what modern grill's are supposed to do! :) Listen to them, with the cloth off - if you like it, that's great - but I did want to chime in on the attenuation 'thing'. You can 'replicate' the cloth and the attenuation by using one layer of generic black speaker cloth, and the outer layer of tan 'vintage cloth' like what is used on guitar cabs. Hold it up to the light and play around with it's orientation. Have fun! b.
