I have no doubt that it has to be the DAC or amplifier in the headphones that causes this.Īfter all, with bluetooth headphones, the entire analog part your audio experience happens only in the headphones themselves. I even connected them with a cable to a xiaomi bluetooth-to-headphones adapter, and with it, to the same laptop - and there was absolutely no hiss. But when I connected them with the cable, they sound perfect.
I tried them over BT with my laptop, desktop PC, and iphone with the exact same results.
And when a song ends, it would continue for ~5 seconds, and then 'click' into silence, with two distinct 'pops'. I just had the exact same experience with the Sennheiser 4.40! Though, I wouldn't describe it as a 'high pitch tone', but it strongly resembled the noise a cassette player would make in between tracks.
