The only thing you can do is changing each driver's volume settings in the service menu, meaning you increase the woofer's volume to +2 dB and /or decrease the tweeter's volume by - 2 dB, this will of course change the factory settings but will give you more audible bass , but not lower frequencies.
Of course, placing the BeoLab 2000 in a corner will also greatly increase the audible bass level
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