Please teach the difference between HI-FI amplifier + DTS decoder and AV amplifier

The main difference in the back stage, HIFI amplifier back stage amplifier circuit, usually materials, workmanship, quality control, sound quality in the AV amplifier on top of the good AV amplifier back stage and HIFI amplifier is not much difference. AV amplifier decoding circuit and DTS decoder is also a little different, next-generation AV decoder, generally support AC-3 and DTS decoding, and part of the support for even to 14.2 channels.