“It’s a better bit rate, better than CD quality,” said one source. “Amazon is working on it as we speak: they’re currently scoping out how much catalog they can get from everyone and how they’ll ingest it.”
The best known existing hi-def music streaming offering comes from TIDAL, whose TIDAL Hi-FI subscription tier costs $19.99 per month and offers CD-quality lossless streams at 44.1 kHz / 16 bit.
In addition, TIDAL also offers a ‘Masters’ quality offering for pickier audiophiles, which presents thousands of albums at 96 kHz / 24 bit.
TIDAL’s ‘Masters’ range is made possible by its partnership with digital hi-def music company MQA. It’s understood that Amazon has not partnered with MQA for its own HD tier.
(link originally spotted on audiophilestyle)