Port Area Question

[Acidburn]

ok, i know for pure SPL you want as much port area as possible but does having large amounts of port area decrease SQ? even if its tuned low-ish like 34hz

[454Casull]

No, as a matter of fact, the greater the cross-sectional area of the port, the less chuffing there is at higher excursions, so you get more music and less noise.

EDIT: And I wouldn't say 34Hz is a "low" tuning point, either. It isn't too high, but something like 20-25Hz is low.

[kingpin_jeffie]

34 is pretty low I mean I dont know too many people who have the woofer in their car tuned below 30Hz.

[Acidburn]

i didn't mean that 34 was low, it was just a number to put up, but so basically if you can get 400 square inches of port, it'd be good?

[kingpin_jeffie]

Yea itd be good but nearly impossible to do.

[Acidburn]

why? ...10char

[Acidburn]

bump......

[Benny212]

larger port area means you need a longer port
for example in a box thats 4 cubes after displacement tuned to 34 hz with a 10"x10" port it needs to be 49.82" long (winisd)
in that same box with a port thats 40"x10" the port needs to be 210.25" long
so 400 sq inches of port area is pretty impractical, but I suppose you could do it if you wanted to

[Acidburn]

this isn't going in a Civic or anything, just theory... so it is possible? just need a hugely long port?

[RMKrider1]

I've heard you actually start going downhill after the port area gets larger then the cone area, So 400 sq. inches would be a waste

[Acidburn]

I've heard you actually start going downhill after the port area gets larger then the cone area, So 400 sq. inches would be a waste

alrighty, that's what i wanted to know

so the port area shouldn't be larger than the cone area of all sub(s) combined?

[RMKrider1]

I think thats right.......BUT I have no proof to back this up!! I've only heard this mentioned a few times.
Maybe rangerman or bigbassman will read this and help out

[Acidburn]

thanks for your help, i hope one of those guys could give me a definite answer

[B_Master_Flash]

Im pretty sure I've heard Lloyd say that for spl comp. you want to have the port area to equal Sd

[Acidburn]

Sd is cone area? and Sd of all subs combined?