question

[spxtreme]

on a spl only setup is vent speed a probblem like should i worrie about keeping the speed low?

[1LoudScort00]

could you possably explain that a bit better, with more detail by any chance

[spxtreme]

like on SQ  u jeep the port noise down does that matter in spl caseu i see some people shreddin paper so i know there movin alot of and  in a small box

[2000LaDe]

in spl u usually have quite a large port area tuning the box quite high.

[spxtreme]

ya but tuneing the box high and going for just 1 tone no music  does vent speed matter like port noise gunna kill the spl sound or no

(i dont know if im getting my question out the right way)

[Forevrbumpn]

People say even adding body kits can destroy SPL, or atleast drop there spl by a whole point (seen that somewhere in this forum) I have even heard of simple things like carpeting a box ( I think is BS, but who knows) can lower a score some. But I bet a high, wind velocity from a port can be damaging to a score. Personally, when I do ported boxes, I try and keep SQ boxes, the port area I keep as close to 1/4 the area of the cone, per sub, and go for longer ports, then SPL set ups, I go for 1/2 cone area to port area ratio, so a 12" with about 90square inch cone, I would do a 45 sq inch port, and round the port on the inside, and outside. When I worked for the speaker company I  rescently left, we even decided to stay with ports with all even sides, like square port, or close to square, and aero ports to keep wind noise down (for home audio applications)

if you notice, doing a larger port, will reduce the wind velocity alot.

Also, what I have learned is that a port , dont think of it as a vent, pressing, and sucking air in and out, think of it this way, "A port is where the air atoms resonate inside the port, at the tunning point, not moving in and out, but just vibrating in place- the larger the port, the more atoms vibrate inside the port, hence a louder, higher spl you should acheive" This is why I use transmission line enclosures all the time, all that air inside the transmission line, vibratating all those air atoms, easy way to gain high SPL gains, with barely even getting the speaker moveing at all.

that was my 5cents on ports ;D