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Message: <blockquote data-quote="Vanquish" data-source="post: 48273" data-attributes="member: 84">For E36, all the 3 options above are workable. You would have to decide on what is your prefered set up but it looks like you want to retain the boot space as it is. I suppose 2 free air subs would be the way to go about this. You can find either a stereo amp / mono amp but much will depend on your subs specs.To achieve proper staging of the low notes and allow it to filter into the cabin effectively, the stock rear speakers have to go. The subs will have to be installed onto thick solid MDF panels which then will be attached to the rear shelf. Some extra work is needed here but a good installer can handle it.Which is better between free air / sealed enclosure ??? Both have their PROs and CONs but ultimately you go with what works for you. But I think the difference between these 2 is quite minimal as a well set up pair of free air subs can almost match a sealed enclosure's bass extension.Which subs are you considering ? Cheers.</blockquote>