The best replacement for ported is sealed.

The best alternatives to ported are rated as following:

★★★★★	sealed
★★★	bandpass
★★★	manifold vacuum
★★★	sealed box
★★	sealed enclosure
★	vented
★	sealed subwoofer
★	sealed sub box
★	non ported
★	sealed speakers
★	manifold vacuum advance
★	sealed subwoofer box
★	unported bass drum
★	sealed boxes
	non ported barrel
	sealed subwoofer boxes
	full vacuum advance
	sealed enclosures
	not ported
	sealed sub
	bandpass box
	compensated
	sealed subwoofer enclosures
	non ported sub box
	manifold
	sealed spl
	seal
	sealed home theater
	enclosed sub box
	vented box
	manifold advance
	non ported subwoofer
	sealed speaker box
	unported
	unported sub box

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Scale is based on the average worldwide traffic of ported in all years. Click on graph for more.

ported

sealed

bandpass