[DaveC[_2_]]

I'd like to add a simple op amp-based tone control circuit to my preamp for
desktop speakers & sub that I'm modifying from stock.

This is the simplest I found:

http://www.simplecircuitdiagram.com/2010/02/03/single-op-amp-tone-control/

(I have +/- supplies so I will be eliminating all coupling caps and changing
Vcc/2 to ground.)

What are the positives and negatives to this design?

Better circuit (yet simple)?

Thanks.