Originally Posted by adrewitz
Apologies for the light threadjacking but I'm working on my own pair of AR93s speakers and was hoping for input from a couple of other owners.
Do you guys have any sealing material/gasket between the rim of the drivers and the speaker enclosure? I just took apart one of the speakers to replace a failed tweeter and noticed that I don't have any sealing material behind the drivers.
I had my speakers re-foamed by a shop ≈10 years ago so I don't know what was there originally. I had thought that AR was big on sealing their enclosures...
The best source of information for Acoustic Research loudspeakers is :
Home Page | The Classic Speaker Pages
Some sort of roofing tar material was and still is used to glue and seal speakers in place. A cheap solution, and NOT convenient for frequent rebuilds. I don't know the brand name used, but it melts at quite low temperature.
These days a lot of firms use a soft plastic gasket to seal against air leaks. Quite important with closed box. Air leaks produce a curious shudder on bass cones, but there are a variety of plumbing materials or cardboard that would do the job quite adequately IMO. I increasingly get rubbery stuff from builders merchants.
FWIW, the schematic I came up with was simply untangling the confusing AR filter schematic. AFAIK
, it is an accurate electrical representation of the crossover in a form the modern eye can follow. Just Topology really.