In my Xceed Platinum the JBL sound system is installed. It should not be about the sound in general here. In my case it is the case that I usually listen to music with a USB stick. Some songs and albums sound great, others not so great. Sometimes it is the case that from the trunk where the side speakers are installed a clear vibrating can be heard. I then have to reduce the bass significantly via the equalizer, that is annoying. If someone already has the disguise around the speakers the Is this complicated, or is it not possible for you to do so? Which material did you use and did it bring something to the sound? It’s not about the door speakers, but only in the trunk. I would be very grateful for information.