round or slotted

smoker · Post by **smoker** » Mon Jul 18, 2005 4:44 pm

just curious what everones preference was and why......and no bull either if you just think one looks cooler than the other i want to know....

Ryan from Ohio · Post by **Ryan from Ohio** » Mon Jul 18, 2005 5:12 pm

I really have no preference.

IMO it is easier to change out PVC than it is wood (slot port). Slot port is better looking and is n00b proof (They cant mess with the tuning).

The beretta will more than likely be a slot port design.

Post 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.

smoker · Post by **smoker** » Tue Jul 19, 2005 6:24 am

so it sounds to me like a round port would be easiest in a trunk if space is tight and a slot if you can manage it would sound best at volume in a hatch............

Darthness · Post by **Darthness** » Tue Jul 19, 2005 8:13 am

it'd be easier to get a longer port slotted though.

http://www.ddaudio.com/dd/caraudio/encl ... ending.asp

Post by **GlassWolf** » Tue Jul 19, 2005 2:18 pm

yeah darth but the point is with a round, say 4" ID port, you usually don't need to bend it, since the smaller the diameter or cross sectional area of the port opening is, the shorter the port needs to be for the same tuned frequency.
example: 4" port is 8", same port 3" diameter would only be maybe 5" long. Now if it's a slot port the width of the box, and say 3" tall, you're talking like 54" long.

(no I didn't calculate any of that.. it was just an example.. the actual emasurements will be different and vary by enclosure volume.)

smoker · Post by **smoker** » Tue Jul 19, 2005 2:29 pm

with the same driver,internal volume the same, port tuning the same, will one be louder than the other?.......

smoker · Post by **smoker** » Wed Jul 20, 2005 6:54 am

Ryan from Ohio · Post by **Ryan from Ohio** » Wed Jul 20, 2005 7:19 am

No

It shouldnt

smoker · Post by **smoker** » Wed Jul 20, 2005 7:54 am

thats what i thought....