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Great project. But you its not really a fair comparison wit the BOSE mini... yours is more that TWICE the size!! more size= more room for BASS.Compare it with a same size commercial BT speaker and you've got a test.
I own a bose mini soundlink too, and it was, when I bought it, the best sound for the size in the market. the big limitation on these speaker systems is size: If you make it bigger, you don't have that limitation anymore. But in no way can you build a speaker yourself THE SAME SIZE of the bose unit, that has better sound. If you could, all the other companies that make sound systems of that size would have been able to do it. But they all lose in the bass wars to the mini bose :)