Perhaps I am missing something but why don't you make the front chamber smaller: 20 litres instead of 50 litres. That will give a much flatter response which is more easy to use with standard subwoofer amps with build in bassboost. Perhaps you can open up the throat to 450cm2.
I know the large 50 litre frontchamber will give a higher SPL max around 30Hz but for home use I would think the 20 litres frontchamber version sound better. Response in a corner will be +/- 2dB from 30-100Hz...
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