maybe you can try: https://kineticsnoise.com/home/noise-control, but need careful construction execution to get vibration decoupling of the "floating room" and the real room boundaries
maybe it is better to have sound insulation room for home theater in apartment :), but it will be really tough to have good sound insulation for 60Hz below
even the freq response already looks good (inside 6dB band flatness, cmiiw), pull the main speaker a bit away from the wall will help to get better sound, and can increase the bass detail, and check it with stereo music you are familiar with (that contains quite full audio spectrum, bass mid, high)
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