Where have all the dynamics gone
Here Here,came to the conclusion several years back remastered=run it through a compressor.
My brother's trade is sound production. He explained it to me when he was working in a radio station. It's about maximising the bandwidth you have at the same time as protecting the levels outbound to the transmittor.
Allowing large gain swings from the studio can result in issues for the transmittor and it will cause issues for too many "casual listeners" if the DJ is allowed to raise and lower the volume.
So they use a multiband compressor. A normal compressor won't work because dance music with a heavy bass beat will cause the compressor to "breath" with the beat. So they use a multiband compressor and compress each part of the range individually.
What this basically gives you is a very, very strict volume and EQ normalizer. It will undo anything the DJ does with the EQ or the volume. So when people tune in they get a constant, stable volume, no matter what is playing.
In pop music, just like in adverts on TV, it's about maximising the levels and energy in the track, while also compressing it so much that it's unlikely to "get away" from the listener in terms of volume. It makes it idiot proof to play loud basically.
Personally I did some digital DJing for a few years, when making actual CD mix "tapes" it is actually really difficult to master. You want a consistent maximum volume that will not clip, but with uncompressed wide dynamic range audio, like a heavily EQ'd dance record, that is very, very diffitult if not impossible. When I asked my brother about this he just said, "There is career in just mastering", it's not easy. My solution, like nearly everybody else was a hard limiter, aided and supported by a fairly agressive compressor.