I would assume it means there are four separate DAC chips.  This would be to push specs, or the perceived quality to the bleeding edge.  Obviously each channel (left/right) needs a separate DAC circuit which are usually in the same chip.  By completely keeping the circuits separate in...

If you don't want a huge phone you should look into the (BBK) Vivo Xplay 5. It has a curved screen like Samsung (the screen was supplied by Samsung), 5.4'' screen, but the overall phone is not that small. The Xplay 5 was a bit of a disappointment, except for the world best audio quality (and...

  You should try the (BBK) Vivo Xplay 5. Vivo uses BB Op amps.  Brilliant, the original brand to use a HiFi Op Amp. I now have the V10 and I had the Xplay 3S. I think the 3S sounded better, but I didn't own them at the same time using all the same headphones or A/B comparisons. The 3S could...