Largest Tuba?

[LCTuba89]

Nirschl 6/4 BBb vs Nirschl York model 6/4 CC...

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Holy hell I didn't think the BBb was that much bigger than the CC. Although when I play tested the BMB 6/4 CC and the BBb, the BBb felt considerably larger and sounded as such. I ended up getting the BBb, the notes sat better and the tone was IMO bigger than the CC. They are heavy as hell though.