HiFi is a tricky thing to deal with. Please do not define what you like because every track is recorded differently so, you cannot say, you need more bass and treble etc.. because bass, treble, clarity etc have already been added to track carefully during master/recording stage. Number one, Bluetooth is not meant for audio unless a top-shelf interface like Wyred4Sound bLink kind of items are used. So, the source must be good. Good is like, really good - one can start with something like Benchmark DAC1 or higher as budget permits. as soon as you have right source connected to rest of the chain with a decent interconnect, rest of the chain should behave.
This is my experience out of my journey that started with a self-built amplifier to Sonodyne Uranus I to NAD C352 and now at a stage where my system costs as much as my car (though it is an old one ..lol...
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I did not mean to confuse but just wanted to share my opinion.
And, if you look at this closely, it is all about one's opinion. What sounds great to me, might sound trash to you.
But I can confidently tell you that a good DAC tells me that how nicely all these songs have been recorded, even the 30-40 years old ones. Wasn't that one of the aims of digital music?