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I’ve been happy with this one - no lag for movie audio and connects fine. The “connection made” sound isn’t super loud or offensive either, which is important.
1mii Bluetooth 5.0 Receiver, Bluetooth Audio Adapter with 3D Surround aptX Low Latency for Streaming Music from Smartphone/Tablet to RCA/3.5mm Aux AV Receiver and Home Stereo Speaker-B06 https://www.amazon.co.uk/dp/B07YTKQ78N/ref=cm_sw_r_cp_api_i_YcOUEbD68YRMZ
Actually scrap that. I didn't realise Chromecast audio is wifi. I need Bluetooth as I have no access to wifi