Diameter was 22.Are you talking about a sweet spot provided the drum is double headed with no port? Or a ported front head? Muffled or Unmuffled? PowerStroke type head or regular single ply ambassadors?
With all the variations one could come up with for any given size, the sweet spot will be different. And then what is the sweet spot for? For the best sound? For the best mic’d up sound? For jazz? For rock? What is the sweet spot suppose to be defining?
Hayman used to do 15" deep bass drums. I had a 26x15 it went kerboom! You could sit at the opposite end of a room and you'd feel the air from the port hole.I’ve never seen a 15” depth for instance and a few go higher like an 18 or 20. I’d consider these exceptions to the rule.