i believe the 10 inch, blaupunkt sub has like 500 watts rms. Which is pretty serious that close. there wattage rank is also a true rating, so it would be like 800 or 1000 on other brands i believe. I think if you mount one sub in lower center, and put some 4" speakers on each side, integrated with existing sound system, it would sound great.
Side note, ive been considering puttin those same subs in my slk, but cant do it in the cabin

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