aptX HD is based on 24bits / 48kHz and also known as aptX Enhanced 3. Standard apt-X and Enhanced apt-X Codecs Standard apt-X and Enhanced apt-X are proprietary audio coding algorithms, which can be licensed from CSR plc. and are widely deployed in a variety of audio processing...

What do you mean by "48kHZ improved the sound very much on C600N"? C600N has aptX HD capability, but it's not advertised on Sony website. Using Mac os X Audio and Midi Utility, you may see 3 choices for C600N Audio Output: - 8000Hz which is used for phone in/out - 441000Hz which is either for...

Hello, I own WI-1000-X, here is my feedback about it: PRO - NC is great, impressive. I keep the headset on my head almost all of the time to benefit NC even if I don't listen to music. - Battery is also lasting long - Microphone does not look very good, as mentionned in amazon feedback -...