Gebhard,

Did you replace your head unit? Otherwise, the poor tonal quality likely relates to the speakers' incompatability with the OE head unit.

BTW I have both 4" mids and 1" tweets up under the factory grilles on the dash, and they sound great!

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo