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Perhaps someonw could comment my theory - compared the Wick mouthpiece rim, S-rim is 0,5 mm wider, but rim width
is 0,25 mm narrower, so both mouthpieces are total outer diameter of 28 mm. But what about so-called "high point" of the rim?
How important is that and how it influences?
Which parameter is more important? Rim width or ID? I remember trying out also S-18 rim, which has same ID size than
my Wick, but as rim was only 4,5 mm wide, it was for me too small room for lips.
Mouthpiece rims are often specified in terms of inner diameter (ID) and rim width (RW), but of course this also determines the outer diameter (OD):
OD = ID + (2 x RW) + OS
[where OS is a small offset to account for ID, RW and OD being measured at different heights]
In my experience, the outer diameter is very important in determining how well the rim fits the player's facial features.
So, ID, RW and OD need to be chosen together. All 3 are equally important.
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Anyway as Paxman was out of stock of regular 23A cups, I ordered heavycup at first. Would regular cup or even Z-cup make my playing easier, so getting used to the rim takes less time and is not so painful? Or is it like cheating myself?
A lighter weight cup does place less strain on the embouchure (the same can also be said for lighter horns).
So, this might help a bit, but it won't get around the need to simply spend time building strength with the new setup...
It takes several months to build back up to full strength using a new embouchure - 1 month is still very soon.
If you're happy with the new setup in terms of playing flexibility and the sound it gives you, stick with it, and it will get easier with time.
If the larger ID is a problem for you, then you could probably order a DW4-rim copy to fit your PHC cup.
But after a month on the S, it would also feel like quite a change to go back so you'd be a month behind again!
Aside: There have been similar posts on this forum before suggesting that an "M-18" rim could be quite a popular addition to the standard selection?