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The question was whether you can connect the source music to the AK300 via Bluetooth. You’re using AK Connect which works over WiFi.
The ones listed as 2018 are official USA models. The higher priced non-2018 ones are international imported models.
I can't speak for the HA-2 but I previously had a Centrance DACport HD, Dragonfly Red, and AK300. The Dragonfly Red uses a similar ESS...