As far as I know on all the BT adapters, only Radsone EarStudio ES100 has ever claimed that their EQ will (and indeed does) work on USB DAC (*the other one is Qudelix 5K, which is by the same designer as ES100, though it is not actually out yet). Assuming EQ will just work in USB DAC mode on any other BT adapter without confirmation from either the manufacturer or the users is not a given, at least not in this point of time. In fact, this is one of the main reason why ES100 is so popular, especially among EQ user. It is the exception, not the norm - otherwise ES100 would have lost its biggest sale point.
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