So I've built around ten boxes before and have designed many for my buddies they always were very musical and hit hard all around. (always had 15s) But I've built my first ported enclosure for a 10" skar vvx and It sounds goob except that it really lacks in the punch the really quick bursts of bass that really hit hard and on point. you can hear them but not loud like normal, the rumble really over powers them in this build, unlike others.