About the model This model???s range extends down to low E . Yamaha Professional Model bass clarinets, all of which are meticulously crafted by hand, give you a rich, warm sound with powerful projection and extremely accurate intonation. Each tonehole undercut is individually shaped for a beautifully balanced, remarkably responsive instrument. The YCL-621II can play down to low E , while the YCL-622II???s range extends to low C.