I still have the problem with my front system in the Golf III which comes just way too little bass / low tone. Also the kickbass is missing strongly. I have the Rainbow SLX 265 Deluxe, so a good beginner system. That depends on my Wanted 4/320. I reach enough level for my requirements (Sub is an AS Radion 12BR) but due to the missing bass / low tone front the connection to the sub is relatively bad. Especially with Rockmusic the bass is extremely missing at the front. For installation: The R ainbow system is installed in very stable wooden GRP doorboards (coated with black leather), so the recording is super stable. (picture) Door boards have been insulated with GFK mats, as well as door interior sheet at the back of the foil. This was cut out in the area of the woofers. And yet: Many original LS bring on the radio even more bass like my Rainbows with this installation on the Wanted. Why????