"Since they're so inexpensive I ordered three of the sizes. The 10mm,
12mm &14mm sizes. 14mm - those are huge! Easily more than a half
inch wide! I can see why you would need a 3/8" copper cap. Did you
notice if the size of your resonators impacts different frequencies than
other resonators? I'm wondering if something that big might have a
greater effect on lower frequencies. On the other hand, could their
size allow them to help bring out higher frequencies without adding
harshness? Do you have other sizes and/or types of resonators?
"
I actually went to Home Depot and measured the inner diameters of all copper caps available with my vernier caliper. Obviously the 3/8" cap was the smallest I could find and didn't want to use anything bigger than that. The ID of the 3/8" was slightly less than 14mm, then I thought a cone with the OD of 14mm would fit into the cap perfectly if I forced to insert it into the cap. And it wouldn't come out once it's tightly placed. I searched for something with the OD of 14mm. It didn't take long to find these beautiful bells. It makes beautiful timber bell sound just like the triangle percussion when tapping it with some metal object like knife. Two weeks later I got 30 bells and started assembling my DIY resonator cups that resonate magnificently. You'll be amazed. Oh and, I won't try to make any more resonator cups so I will never know your question regarding "size vs frequencies". That's it.
Geoff,
It's just self-indulgence.
I actually went to Home Depot and measured the inner diameters of all copper caps available with my vernier caliper. Obviously the 3/8" cap was the smallest I could find and didn't want to use anything bigger than that. The ID of the 3/8" was slightly less than 14mm, then I thought a cone with the OD of 14mm would fit into the cap perfectly if I forced to insert it into the cap. And it wouldn't come out once it's tightly placed. I searched for something with the OD of 14mm. It didn't take long to find these beautiful bells. It makes beautiful timber bell sound just like the triangle percussion when tapping it with some metal object like knife. Two weeks later I got 30 bells and started assembling my DIY resonator cups that resonate magnificently. You'll be amazed. Oh and, I won't try to make any more resonator cups so I will never know your question regarding "size vs frequencies". That's it.
Geoff,
It's just self-indulgence.