Passive tone control

Hello all,
I am curious as to your expert opinions on the use of a passive tone control board. Something akin to this fleabay example:
Amplifier Passive Tone Board Bass Treble Volume Control Pre Amplifier Board Kits | eBay

I realize that this is a "subtractive" option as far as gain is concerned. However, I am more concerned whether fidelity could be an issue as total volume shouldn't be.

Thank you all for your time and your knowledge!
 
Hello all,
I am curious as to your expert opinions on the use of a passive tone control board. Something akin to this fleabay example:
Amplifier Passive Tone Board Bass Treble Volume Control Pre Amplifier Board Kits | eBay

I realize that this is a "subtractive" option as far as gain is concerned. However, I am more concerned whether fidelity could be an issue as total volume shouldn't be.

Thank you all for your time and your knowledge!

I've used a few of the China-spec boards now for various things and they've all worked as expected. You can always use decent quality pots/etc if they're noisy, but aside from that I've never had an issue.