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The TU33 is at the limits (maybe past) of what I can handle. It can easily soak up all the air I can blow into it, shrug its shoulders and say: Is that all you got? Plus it's easy for me to have some face muscle in not quite the right position to start a quiet entrance, so there is no entrance -- more like sneak in the back door two beats later. Something like the Laskey 30G is more my size. The tuba can still be heard with the 30G, but the KAHUNA FACTOR isn't there like it is with the TU33.

You will probably need a good set of headphones to hear the difference in the two mouthpieces.

Here you have the TU33. I put the pedal to the metal on the last verse (after the key change). If you listen close to the last note, you can hear how much of the bass was coming from the tuba when I run out of air, and the tuba drops out. Even though it's a lot of work to play, the TU33 sure makes the 191 let folks know what a big B-flat horn is for.
http://t-recs.net/mpegs/FBC/10_14_07/hymn1.wma

And here is the Laskey 30G. Not bad, but for all we can tell, this sound might be coming from some weenie C horn.
http://t-recs.net/mpegs/FBC/10_28_07/hymn1.wma

My hunch is that even brass players won't be able to accurately identify the large mouthpiece from the small one.

There is considerable difference in the amount of low fundamental in the tone with the big mouthpiece on the 191. Something like the Laskey can be made to punch through the ensemble with the harmonics, but the TU33 in the 191 gives the ensemble weight. If you can't hear the difference in the recordings, then your headphones aren't doing low end response well.

Granted, there is a fifty-something rank Aeolian-Skinner running close to max, an 80 voice choir that is aggressively mic-ed, the woodwinds are mic-ed, and a few hundred people are in the audience; but the difference in tuba mouthpiece can still be heard through all that wall of sound.

Where are the drums and electric guitar? I can't hear them in the mix???

Where are the drums and electric guitar? I can't hear them in the mix???

We're the 11:00 group. The 8:30 group is the "contemporary". In this case, it's more of a classy jazz: guitar, bass (guitar), electric drums (well played ... egad!!), sax/flute, trombone, trumpet, and piano. Those guys could make a fine CD if they wanted. The staff at this place try to keep the music quality as high as they think they can get away with before going over the heads of too many in the audience.