A regular client of ours from Moseley for whom we had installed a backup camera on their 2015 BMW 335i contacted us about an audio upgrade. One of the factory speakers was rattling and they wanted a bit more output. Having been completely happy with our previous work in adding a backup camera to the factory video screen, we were their first choice to upgrade the sound in the vehicle.
One of the manufacturers we do business with, Match, offers BMW-specific direct replacement speakers that drop right into the factory locations. We replaced the rear speakers with the MS 4X-BMW.2 two-way coaxial speakers and installed a Match UP7 DSP amplifier that not only adds power to the BMW HiFi system, but also functions as a digital signal processor to tune the entire system for a much-better sound output.
The re-tuned system was a huge improvement, and both the client and his son were very happy with the results.