I'm an ATC owner and fan of the 3" mid dome.
Must be doing something right as it's been used, with various refinements, in ATC's 3-way speakers for the past 45 years!
Volt speakers make a superficially similar 3" dome though the flange profile (and likely many other details) are quite different. Does have a similar heavy magnet structure at 8Kg (ATC is 9Kg for their SL model!).
Yamaha is another company that used/uses even larger dome midranges - according to the specs 88mm in the NS-1000 and 80mm in the NS-5000.
Must be doing something right as it's been used, with various refinements, in ATC's 3-way speakers for the past 45 years!
Volt speakers make a superficially similar 3" dome though the flange profile (and likely many other details) are quite different. Does have a similar heavy magnet structure at 8Kg (ATC is 9Kg for their SL model!).
Yamaha is another company that used/uses even larger dome midranges - according to the specs 88mm in the NS-1000 and 80mm in the NS-5000.