I changed the values. Is my graph ok? I have very limited knowledge on LTspice analysis...
I made the changes in tone control circuit.Results are below.Your circuit is fine but is missing a filter capacitor parallel with your R8 to keep power supply noise attenuated.
It is the same as this circuit:
Maybe your ears (because you are old?) or your tweeter does not produce the boost shown above 8kHz?I made the changes in tone control circuit. Results are below.
1. No treble at all.(with 560pF & 10K side resistors)
Maybe your woofer does not produce sounds below 100Hz?2. BASS will increase after passing the halfway mark of Bass pot.