FiiO Q5, Flagship DAC/Amp, an Dual DAC, USB/Optical/Coaxial/Line in, share the same amp module with X7.
Apr 20, 2018 at 2:03 PM Post #1,802 of 3,173
Of course you have degradation with a lossless file through BT without LDAC codec.
When you listen to Spotify premium I can’t hear the difference between usb and BT connection with APTX or AAC codec.
 
Apr 20, 2018 at 2:25 PM Post #1,803 of 3,173
Of course you have degradation with a lossless file through BT without LDAC codec.
When you listen to Spotify premium I can’t hear the difference between usb and BT connection with APTX or AAC codec.

Technical correction - LDAC is not lossless. Max transmit rate is 990 kbps. Sony claims LDAC can support 96/24 files. Uncompressed, that would require over 4.5 mbps. Best lossless compression to date is less than 50%, which would be a 2.5 mbps stream. 44/16 on the other hand is possible since a lossless compressed stream would only need about 700 kbps. Even then, 990 is the max LDAC rate in the most ideal conditions. It also supports 660 and 330 bit rates to scale with the quality of the BT signal. Those rates change on the fly so in real use, it's highly doubtful you are getting full 990 100% of the time.

Personally if I listen to an AAC file from a 24/96 master, I have hard time telling the difference. Pretty sure I would get at best 50% accuracy in a blind testing. I also like the practicality of AAC native BT streaming because it's low enough bandwidth that gives great battery life and works over a wide range fo BT connection quality. Great for portable listening.
 
Apr 21, 2018 at 8:02 AM Post #1,804 of 3,173
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