Since there is no information on frequency response or component values, I decided to do a completely new approach. I chose the frequency response of a good 12-inch guitar speaker and tried to simulate its frequency response with opamp based filters with no inductors which usually are quite large and bulky. The figure below shows the 12-inch Celestion Vintage 30 speaker and its frequency response:
The figure below shows the 12-inch Celestion G12M Greenback speaker and its frequency response:
As it can be seen, SPL (Sound Pressure Level) frequency response ramps up from 70 dB to approximately 100 dB between 20 Hz to 150 Hz, it stays flat at 100 dB until 1 kHz, it has a small 6 dB notch at 1.5 kHz, and it goes abruptly up close to 110 dB at 2.5 kHz, and then it starts to go down to 80 dB with a steep fall of 10dB at 6Khz. At 20 kHz is somewhere between 60 dB and 70 dB.
In order to replicate a similar speaker frequency response, I designed a 4 section filter based on Sallen-Key opamp topology. I used TI Filter Designer tool to design the speaker simulator filter.
The figure below shows Speaker Simulator schematics.
The resulting frequency response is shown in the figure below: