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I'm trying to get the best feed for my B&W wireless headphones.
I'm using a laptop at the moment, but that means using the shitty on board DAC and the also quite shitty Bluetooth output from the laptop which doesn't support aptx.
If I head a headphone amp which supported aptx, I could plug it into my pre amp and I'd be getting the signal out of my DAC which I would guess is a lot better than what the laptop is giving me.
What are you trying to do because the 2 functions might coexist but there's no real reason for it. Bluetooth doesn't need the analog amplification that a headphone amp would provide.