One of the main drivers for remastering older recordings is that records were made to fit an era. For example, listen to The Beatles early recordings and then listen to the BBC recordings of the same time. The difference is phenomenal! The records are very bright and the BBC quite darker, especially in bass. The reason: hi-fi systems didn't exist yet and most people listened to records on a player that had a small mono speaker built into it. If the bass was too high, the record would skip! But the BBC recordings were aired over the radio. So again most people had radios with a small mono speaker, which the BBC compensated by making the recording darker with more bass to get a better fidelity out of the recording. Producers have always considered the intended listeners typical equipment for mastering
Pink Floyd was very avant garde and pushed the audio envelope. They were really forefathers of modern recorded sound, and there is always a bit of audio magic in their records!
Edit: forgot to mention the headphones... I've played with a few different headphone set-ups for the PS3. My favourites are the cheap PS3 ones from Sony. The more expensive ones are not very comfortable (head strap gives me a headache), and the audio is no better. I'm seriously considering some Astra A40 though, I like all I've read and have really enjoyed the optical output when I ran through my home theatre system (it has an Apple TV plugged into it now

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