These great subwoofers literally take up no space. Although they are on strike. I've heard other flat panel speakers and they don't compare. Passive radiators play a crucial role in balancing the bass. I currently have in my 09 c300. The rear trunk has a dashboard inside the car. So I didn't use them under the seat as they are there to boost and dampen the mids and highs. I installed them there and the sound couldn't be more perfect. I will buy some more for my 08 x5.
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