I wish you simulated the circuit with the boost-cut control at halfway, then at full cut then at full boost.
I tried to figure out how it works and I think the boost and cut labels are backwards.
I do not see a problem with the cut.

 

I wish you simulated the circuit with the boost-cut control at halfway, then at full cut then at full boost.
I tried to figure out how it works and I think the boost and cut labels are backwards.
I do not see a problem with the cut.

Yeah i believe you are right about the potentiometers, I changed them out for an optocoupler controlled portion of circuit.
I'm really struggling with this cut function, it doesnt seem to pass the notch filter signal through the adding resistors. I've attached a picture of the simulated responses and where i've tried putting buffers, and the general arrangment of the circuit, (no-zoom).
Sorry to bother you for more help but i just cant seem to impliment it.

 

You do not need two buffer opamps in series. You also do not need a buffer to feed the very high input resistance of the buffer opamps.

I think that all the other filters are passing the frequencies that you want notched. Then maybe filters in series (instead of added like I showed)are needed like you had originally.

 

You do not need two buffer opamps in series. You also do not need a buffer to feed the very high input resistance of the buffer opamps.

I think that all the other filters are passing the frequencies that you want notched. Then maybe filters in series (instead of added like I showed)are needed like you had originally.

Okay so i have to back to the series version? I'll swap in the buffers for caps also, I think i have to recreate the whole circuit in TINA to gain the correct models for simulation. Will there be no DC bias if i have the buffers in? What about balancing the inputs to the opamps?
I was going to ask your opinion on the ESP crossover and summation circuit if i used the NE5532s since its much simpler circuitry. I attached some images.
ESP crossover and sum. http://sound.whsites.net/project153.htm

 

You are selecting old and complicated equalizer circuits. At home I do not use an adjustable equalizer. I have the tone controls set flat and I added a bass boost circuit so my 8" woofers sound like subwoofers. At work a small new speaker sounded bad so I designed and had thousands of circuits made to permanently boost the bass, flatten a peak in the mid-range and boost the highs. Every circuit I demo'd was sold.