^ both my car and van have 10" subwoofers in custom enclosures made by the installer, they are wired in XLR connection kaya easy to remove if i need the trunk. power is coming from 5ch amps installed and tucked in neatly and out of view under seat. my suv have no amplifier and subwoofer, all power coming from HU but the front speakers upgrade was good enough for me that tonality wise, i felt that i don't need a sub. lately, i was with a friend with the same car fitted with an under seat sub, well i think that i need one now