What is the least compressed signal?

Hello everyone.I was wondering what everyone's thoughts might be about what is the least compressed front end signal? A friend of mine recently told me that radio signal is compressed. So I thought maybe a direct connection to a CD player? Or, since CDs are pretty compressed, maybe a record player? Thoughts?
the reason I ask is, my friend recently gave me a fantastic pair of speakers. And I've been listening to the radio through them. He had a disgusted look on his face and told me I was not using these speakers how they were meant to be used, because the radio signal is kind of crappy and compressed. I would love to use the speakers as they were intended. Meadowlark kestrel hot rods hooked up to an Integra receiver w/ kimbers
So last night I listened to "audiophile uncompressed quality" music through my headphones, via my cellphone and YouTube. It didn’t sound any different than normal. Would that be because of the cellphone?
I suspect audiophile uncompressed quality could mean just about anything except MP3. And I actually would not rule out MP3. Most likely a bit of salesmanship in any case.
In any event, lossless and high bit rate/high sample digital are the gold standard of dynamic range. Vinyl doesn't even come close even under ideal circumstances. 
Here’s a page from the Dynamic Range Database that shows very clearly - at least for this example of Abbey Road - that the dynamic range of vinyl can be as high or even higher than lossless digital or hi bit rate digital. The issue is not black and white. 🦓 Even some SACDs and SHM-CDs and Hi Res downloads are being aggressively compressed. That’s the whole point. Read ‘em and weep! 😢

”Perfect Sound Forever!” 🤗


Pretty sure I debunked that website and explained why their results aren't worth anything, but I'll explain again if I wasn't clear.

That website is merely a database of user submitted results using any number of methods to gain a measurement. It's been proven that the most popular tools used to measure the dynamic range of vinyl produce false results. Results from other media may be suspect as well. There's no scientific controls being applied there, and the results are, at best, as dubious as the demonstrably flawed methods used to formulate them.