Can anyone tell me the difference between the premium sound and just the normal cassette deck on my 85 gt? Previous owner did a radio/speaker delete and I have nothing to compare on my car vs an 86 lx I found in the junkyard with "premium sound". What components would I need to grab to make my car premium sound? Seems like there are tweeters and some sort of puter box under the dash pad that I don't recall seeing on my car when i had it apart. the speakers also say "premium sound" on them. Center console was gone so I'm not sure if it should have some sort of equalizer? Is the wiring all there on my 85gt to upgrade and put back to stock? I don't think my car had the premium sound factory, but I'm really not 100% sure.