I use the 2x4HD to equalize my three subs with filters generated by MSO. For that it is fine. I would not want to use it to equalize at higher frequencies when its imperfections would potentially be audible, and for the main speakers I only have one channel left on the 2x4HD (and none if I decide to add a fourth subwoofer). I have an RME ADI-2 DAC, and I am planning to use its filters to equalize the range 80-300 Hz, but I am not yet sure what would be the best way to do that.
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