Here is an interesting link in that Wendy let's us compare three different cellos.
The first, starts at 1:22 is a $5,000 cello, the second at 3:14 is a $180,000 cello, and the
third at 6.06 is a $1,000,000 strad cello.
I think of this comparison as another tool to check one's system, especially in the lower regions.
Is your system transparent enough for you to perceive the differences? The quality of the room,
speaker placement, and/or components could be masking the true inner detail, thus sounding the same.
Maybe just a small adjustment in speaker placement could improve the lower registers. Or maybe you
find that all is quite well with your system, no tweaks necessary.
https://www.youtube.com/watch?v=6TXdkcE09lkThought I would add this link where Wendy discusses bows.
https://www.youtube.com/watch?v=siB-jy_EwUIEnjoy
steve