Update - as planned, had Audison APBX 10 - a sealed 10 inch 400 RMS sub installed 3 months ago. Its under the trunk lid in the wheel well compartment under plastic weather mat and no vibrations. Plenty of space left as I dont have a spare wheel in the well. Not sure I see major difference with this sub. May be my BMW underseat woofers are so good that I cant appreciate this sealed 10 inch)).? I think I would opt for larger diameter flat sub to fit in there if I did it again. May be its the lid, may be I need the second one next to it, as it will fit ok. Will second 10 inch make a difference? The Amp has 1300 RMS birth sheet at 1 OM so should be ok for 2 Audisons.

Nonetheless, when I crank up gain on amp, my heart vibrates and I feel headache - so something is working, just the base is not deep - may be songs I listen to.

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2011 BMW X5M (was "loving the torque!" but used to it now - want more)
1997 Suzuki GSX-R750