Hi. I have the above as I have Amazon Prime by paying an extra £3.99 a month it opens up the music catalogue on one echo device ( Dot ) I have been using it to stream music to my main unit the sound is good though it sounds slightly thin in comparison to listening to the same tracks on CD and the likes. My question is without spending a fortune has anyone any suggestions of any way to improve the sound quality as it could be to do with the Echo not having apt x and the Bluetooth dongle on my amplifier does. Would I be better using a stand alone unit that has Amazon built in instead of streaming through the Echo and if so has anyone got any recommendations and how would I connect it to my amplifier to receive the best signal. Thanks.