I too purchased a pair of Bowers + Wilkins PX wireless headphones over the weekend and am finding my Galaxy S8+ only going up to aptx, not aptx HD. I'd assumed that since my phone had a Qualcomm CPU (835) that I'd have Aptx HD. Glad to find this conversation as it gives some hope that a fix/enablement patch might be forthcoming! My next phone will have Aptx HD as a must-have feature.
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