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
ddjr
Seems a bit condescending coming from a friend. Speakers are meant to be used to listen to music regardless of the source .. it’s their sole purpose. Listen to whatever makes you happy whether it’s from radio, Spotify, Pandora, CD’s, or LP’s. There is joy regardless. Yes, you can feed those speakers a better signal than what radio delivers and hear what they are capable of. In the digital realm CD-quality and/or better will sound excellent compared to radio streams. For streaming, Tidal and Qobuz offer the highest quality if you care to pay for it. Apple Music, Spotify (paid), and the like sound pretty good for lossy-compressed music. Each service offers a free trial .. try them all and see which one suits your taste. Enjoy yourself.
If you are talking about dynamic range I suggest you look at the DR Database website. Some CDs have DR that  matches the LP of the same recording, sometimes it's the other way around. Some recording have limited DR regardless of the format. Generally a radio broadcast is not high fidelity in many or most areas of sound quality including dynamics.

BTW the bit about using the speakers as they were intended is BS. Use them for what you like. But if they are dynamic speakers then a limited dynamics source won't push then to their highest capabilities. 
My advice is go back before they started  "remastering" everything, especially CDs but also LPs, SACDs, SHM-CDs from Japan, Hi Res Downloads, you name it. Cassettes did not suffer this overly enthusiastic compression which is why they sound full and dynamic.