What "model" 2003 e39 do you have? And does your audio system have DSP (like I'm assuming that it probably does)?
BTW...if asking for very specific information...you'll probably get more responses if you're also "specific' about what model & model year you have as well (thanks for the 2003 info...but is this a 525i/it/530i/540i/iT?). Option pkgs may not all be the same for the various e39 models.
The "series options" are not really options, all US e39s have them. Hi Fi speakers refer to the 10 speakers you have in your car - three each channel in front, two each channel in back. If you had DSP, they would have added two subwoofers. I think there is another option called "top hifi".
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