This Porsche 911 991.1 Carrera 4S came with the factory BOSE premium sound system. John really likes his car but he noticed that the sound system is just mediocre, not reproducing much music details and lacking bass reproduction 

We have completely re-designed the purpose of the factory door - using a premium quality Focal BAM soundproofing on both the inside door panel and outer door panel, effectively creating a fully airtight subwoofer enlosure with an absolute minimum of vibrations. Using Helix Compose Ci3 speakers and Ci5 subwoofers with dedicated 3D printed mounts and wire connectors, everything is plug & play and fully reversible.

By combining a mObridge MOST25 DA-G2 optical converter and Match UP 6DSP amplifier we got rid of the BOSE amplifier completely. This comes with 2 huge advantages - first is that there is now enough space to install our our components under the driver seat. Second and more important is of course that we now have an absolutely clean audio signal to work with!

Setting up crossovers (pictured) is just the beginning of a whole sound tuning process but it's as important as all the following parts. Unfortunately, many installers end their installation at this point and consider the job done. 

After this is done, we do a careful time-alignment to create a realistic center sound stage (to make you feel you're on a real concert) and then we EQ every single speaker in the car individually for pure, clean, audiophile grade sound.

 After this, fine tuning of your liking can be done if required.