Audio Equalizer LTSpice Simulation
But it IS working, at least within the limitations of your opamp. The peaks in your response curves fall about where they should.

In fact, if you draw the asymptotes to your response curves, they hit the peak response level exactly where they should, as shown here for the low band filter, V(n002):



You can also see that the lower -3 dB point for V(n013) also falls at 200 Hz, as does the lower -20 dB point for V(n018) &mdash; all exactly as expected.

There are many Reasons not to use a 741 op-amp?

You're running into its gain-bandwidth limitations specifically.

And no, you don't need a separate power supply for every opamp. A single positive supply and a single negative supply would be sufficient.