DIY Downfiring Underseat Aero-Ported Subwoofer Box for Toyota HiAce GL Grandia

Here's another downfiring subwoofer enclosure designed and built specifically for a 2018 Toyota HiAce GL Grandia all purpose van. The usual box-mounted amplifier to drive a slim shallow-mount 12 inch subwoofer, that is powerful enough to shake the whole van without compromising the available space underseat. The enclosure will be then installed under the passenger seat located at second row. There will be some minor modification to be done by sawing off the middle steel seat stand to accommodate the box. Main component used is the Kenwood KFC-WPS1200F / Excelon KFC-XW1200F shallow-mount 12“ subwoofer with single 4 Ohm voice coil. And man, let me tell you! This sub is one hell of the highest quality subwoofer speaker I have ever used! It has very thick and rugged aluminum speaker basket, heavy ferrite magnet, and most of all it has a carbon glass fiber honeycomb cone. Also has a high quality soft rubber surround to add the nice features. High quality push type spring loaded speaker wir