There are a lot of modules on Aliexpress using the CSRA64215 - but it is almost undiscussed here. It's bluetooth 4.2, and some of the modules seem to be implemented pretty well. The one at this link has a relay for aux input management, which seems pretty cool. Is there a reason that no one seems to use them?
Aliexpress.com : Buy Aiyima CSRA64215 Bluetooth 4.2 Wireless Audio Receiver Board APT X Speaker Bluetooth DIY from Reliable speaker wifi suppliers on YI MA Trading company LTD
Aliexpress.com : Buy Aiyima CSRA64215 Bluetooth 4.2 Wireless Audio Receiver Board APT X Speaker Bluetooth DIY from Reliable speaker wifi suppliers on YI MA Trading company LTD
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