Kerfed or squared?
Squared(sharp right angles)tend to make some noise at higher power levels. That makes for port noise that hurts SQ.
Kerfed is a slow rounded edge that helps eliminate port noise period. This is a much better port design period.
Round ports are not worth the trouble IMO.
133whp-126ftlbsTQ Eclipse CD8443,Eclipse PA5422, JBL GTO751EZ, PPI 356cs(Rebranded A/D/S 346cs), JBL p1024, SubThump enclosure, RAAmat BXT, Damplifier Pro
Hatch Nation #140
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