why a 75 dollar blue ray smokes all 2k CD players and any turntable???

"why a 75 dollar blue ray smokes all 2k CD players and any turntable???"
This might be true, if digitally connected a mediocre multichannel receiver with really bad phono-in.

A   "75 dollar blue ray " is some cheap mechanic - which mainly works or does not - and a DAC with powersupply.
The DAC chip will convert internally to 1 or 4 bit, because that is what cheap Delta-Sigma DAC chips fo. This does not make too much damage, given that the tiny tiny powersupply is not giving consistent support allowing for a proper tonality.
The better mastering of the Blue Ray Disk might sound better than the loudnesswar mastered CDs OLSCHOOL usually listens to, though.

I have more than a dozen recordings, originally done before digital mastering, on both vinyl and digital.  While there are real differences between them, I find neither to be superior.  There are things I like about each that are better than the other, and none of them surpass the sheer enjoyment of the music itself.

I still have the first LP I ever bought, while in high school back in 1968.  I have many LPs that will never make it to digital.  But for newbies, vinyl is just not cost effective.

I run a $200 Tascam CD player with an optical link to a good DAC.  Digital data is reliably transported.  That's why we like it.   The difference is all in the DAC.   All CD and DVD players have one built-in, but they are typically pretty cheap.  They sound OK, but taking a direct digital feed from a cheap player to a good DAC will give you very happy results.

Russbutton:  Exactly.

Years ago I had a Pioneer blue ray player which was supposed to be good. The picture was good but when I hooked it up yo my audio system, it sounded terrible.

Back in 80s, I sold technics, JVC, and panasonic CD's.  At the time, they all sounded the same. They were all priced the same. I held off purchasing one to the late 80s. This was around the time, I first heard what HiFi really sounded like - It was a tube Telefunken system imported from Germany. It was unlike anything I had ever heard in the Stereo shop. A warm lush wide soundstage that immersed around my ears. It was magical. I began my CD quest and bought a Philips CD-880. Many told me I was insane for paying $1000+ for a CD player as they all sounded the same. I never heard it before buying it.  Well many can tell you, it does not sound like the cheap $300 CD players of that era. It is a natural sound with clarity. I kept it for 20 years and sold it when the Denon SACD/DVD entered my mix.  Yes 5.1 audio like DTS sounded amazing and was cool but like most things, it was a fad.  A couple of years later, I really missed that Philipps & bought a used one.