Amazon's "Amazon Music" music streaming service is MP3, so audiophiles can be active.
However, "Amazon Music HD", which suddenly appeared on September 17, changed the perception. Lossless HD sound quality (44.1 kHz / 16 bit) and ULTRA HD sound quality up to 192 kHz / 24 bit are available, as well as a significant fee structure that allows you to listen to over 65 million songs from 1780 yen / month. If you renew the contract, the existing smartphone application will change to high resolution.
If you want to play Amazon Music HD on your iPhone or Android, it is better to play on Android. In addition to the preparation of an external USB-DAC (headphone amplifier), Android is more advantageous for both a wired connection using a Lightning cable (iPhone) and a type C cable (Android), as well as a wireless connection via Bluetooth. .
For wired connections that do not use an external USB-to-analog converter, both Lightning and Type-C use a DAC / headphone amplifier prepared near the terminal or in the middle of the cable to convert the digital signal to analog. However, Lightning has up to 48 kHz / 24 bits, depending on the specifications of the iPhone & # 39; a. Because Android does not have such restrictions, depending on the DAC, it can support more data, such as 192 kHz / 24 bits.
When connected via Bluetooth, iPhone can support more data than 44.1 kHz / 16 bits, Android 96 kHz / 24 bits (LDAC and LHDC), regardless of the codec. If you have compatible Bluetooth headphones, you can expect better sound quality.