Jon I had an E82 and my regular hifi sounds just like E93 premium sounds since it had the same equalizer and I could not tell the difference between the two. E82 only came with 10 speakers where M3 comes with 12.
2014 F30 335i Melbourne Red
2013 E93 M3 Melbourne Red
2012 E93 Space Gray (Retired BMW buy back)
2009 E82 ( Sold )
2006 E90 ( Sold )
2001 E46 ( Sold )
My next vehicle would be a Zamboni