This may be a really dumb question... but why does my 92 300d have two sets of inputs on the left front dash speaker? The right dash speaker has only one set, and has a smaller magnet. They look identical from the front (both have whizzer cones and "bullet" type dust caps).

Thanks!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)