Slot-loaded sub designs?

From Nelson Pass: Slot Loaded Open Baffle Project slot loaded subwoofer The Dual 10 SVC 4 Ohm Slot Ported Loaded Enclosure is a high-performance subwoofer enclosure that delivers deep, rich bass with powerful output slot garansi 100 persen slot ported enclosure Thanks for watching and don't forget to subscribe New JL Audio

slot haamstede The “slot-loaded W-frame” still has a slot-loading effect on the woofers, but is more compact We can build it just the height needed to hold the drivers, and