by GlassWolf » Tue Jul 19, 2005 4:37 am
pros and cons to both
a slot vent takes more space, looks nicer, and moves more air at high output, so you'll avoid port whistle, but at lower volumes, like when you're having a conversation with mom in the car and have the radio at old people volumes, the box isn't going to have any feel at all to it, because it can't move enough air through such a big port to really be audible so you may notice a real lack of output at very low volumes.. once it gets moving some air, it does grat.
round ports are easier to install, to make, and to tune. usually no bends needed, PVC is cheap, and you can alter the port length easily without calculating for air volocity changes at bends, and corver volume changes like with a slot vent.. the math is just easier with a round port. You also don't lose as much internal enclosure displacement to a round port, generally.. which means a smaller overall box. The drawback is that the more air you move (more SPL) the larger the port is going to have to be to avoid noise.
pros and cons to both
a slot vent takes more space, looks nicer, and moves more air at high output, so you'll avoid port whistle, but at lower volumes, like when you're having a conversation with mom in the car and have the radio at old people volumes, the box isn't going to have any feel at all to it, because it can't move enough air through such a big port to really be audible so you may notice a real lack of output at very low volumes.. once it gets moving some air, it does grat.
round ports are easier to install, to make, and to tune. usually no bends needed, PVC is cheap, and you can alter the port length easily without calculating for air volocity changes at bends, and corver volume changes like with a slot vent.. the math is just easier with a round port. You also don't lose as much internal enclosure displacement to a round port, generally.. which means a smaller overall box. The drawback is that the more air you move (more SPL) the larger the port is going to have to be to avoid noise.