I wasn't trying to compare their system to Bach's, I was using their own literature. It says here https://www.jk-klier.de/en-gb/mouthpieces:Posaunus wrote: ↑Sat Jul 20, 2024 8:51 pmI have tried several Josef Klier mouthpieces, and enjoy playing them. One should not in any way try to compare their numbering system with Bach's; Klier's is different - more systematic, more sophisticated, and more comprehensive.brassmedic wrote: ↑Sat Jul 20, 2024 1:12 pm Well you have to view it in context. In other literature, JK calls a C cup "medium small". Are you playing a .547 bore instrument? The "small" "medium", "large" cup designations are for ALL mouthpieces. Here, very few players use a C cup with a large bore trombone. So that's why I consider it small for that equipment. On a small bore trombone a C cup is normal. But you said it's a large shank, so I was assuming you're not playing a small bore trombone.
To simplify a bit, Klier's Cup letters are tied to the Throat bore, as follows:
BK: Very Deep; 7.6 mm Throat
A: Very Deep; 7.2 mm Throat
B: Deep; 6.8 mm Throat
C: Middle; 6.4 mm Throat
D: Shallow; 6.0 mm Throat
E: Very Shallow; 5.8 mm Throat
F: Extremely Shallow; 5.8 mm Throat
Klier's Cup numbers refer to the Cup (Inner Rim) Diameter
For instance, in the "C" series (Large or Small Shank):
1C: 28.00 mm Cup
2C: 27.50 mm Cup
3C: 27.00 mm Cup
4C: 26.50 mm Cup
5C: 26.00 mm Cup
6C: 25.75 mm Cup
7C: 25.50 mm Cup
8C: 25.25 mm Cup
9C: 25.00 mm Cup
10C: 24.50 mm Cup
So: A Klier "C" cup is "medium" depth - in large bore pieces just a touch shallower than a Bach "G" cup,
and a Klier "B" Cup is deeper - perhaps similar to a Bach "G" Cup.
So to make the (somewhat unfair) comparisons (at least on paper, since I haven't done it in real life):
A Klier 7B might resemble a Bach 5G
A Klier 7C might resemble a Bach 6½AL or a Bach 5GS
A Klier 6B might resemble a Schilke 51 or a Bach 5GB
A Klier 6C might resemble a Schilke 51B
A Klier 5B might resemble a Bach 4G or a Schilke D5.2 "Symphony"
So, in general, I agree with Brad (brassmedic): Nomsis should try a slightly larger / deeper large-shank mouthpiece for his wind band than his 6CL. Perhaps a 6BL or a 5BL.
[His "E" cups are (in my opinion) really too shallow for a large-bore trombone.]
The following specifications apply to all JK-USA Line mouthpieces:
A models: deep cups
B models: medium deep cups
C models: medium shallow cups
D models: shallow cups
E models: very shallow cups
W models: with extra-broad rim
Models without letter: medium cups
And here https://www.jk-klier.de/en-gb/mouthpiec ... n#Trombone it says, as you pointed out, that is tied with a throat of 6.4 mm, which as I said is pretty small, compared to a Bach 5G, for example, which has a throat of .276" which is 7.0104 mm. Seems strange to tie the cup size to the backbore, but I guess that's what they do.
Have you actually measured the cup depth on these? Because I'm having a hard time believing that JKs "medium shallow" cup is almost as deep as Bach's "deep" cup. I would think the JK would be a great deal more shallow. They do seem to have inner rim diameters that are wider than Bach mouthpieces with the same number, but so do most other makers that use a numerical system like that. And I think the cup depth and the throat are going to affect the brightness of tone more than the inner rim diameter.