I've used an Harman Kardon BTA-10 (aptx capable) with aptx-capable devices, and was quite happy with the sound, but have since switched to WiFi-based Chromecast Audio, as Eric describes in post #10. Better sound, and less money than the BTA-10. But to me, even more important is that once an external stream (e.g., internet radio) is started with a Chromecast via a capable application (e..g, Simple Radio in Android), the originating device can be shut down. That fits my usage pattern perfectly. I happen to connect the Chromecast to an external DAC via optical, but the sound is quite good even using the Chromecast's internal DAC via a 3.5mm to 2 RCA cable adapter.