[Wailin']

I have several mpc's of same length tip opening. One strength of reed that plays well on one mpc doesn't even blow on another of same size tip opening.
Is it because the mpc's have different facing lengths?

Which of these has the greatest influence on mpc reed match?

Tip opening or facing length?

 

[jazzbluescat]

I know that within the Otto Link line the actual tip measurement is often different than the size number indicates. Considering this may be the same in other mpcs, it's possible that all your pieces have different tip openings. The facing lengths make a difference too.

 

[Martinman]

What about the baffle size?