I've read that the twenty series is not quite as punchy in the low end as the i series. That would make me lean to the i series if true. Regarding mids and highs, I suppose anythings possible, but it doesn't get much better than what I'm hearing from my OB1i's. Hard to imaging much of an improvement.
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C.A.P.S Music Server -> Wyred4Sound DAC2dsd SE -> Wyred4Sound ST1000 mkii -> PMC IB2s
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