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[port area]

http://www.carstereo...icles.cfm?id=31

tanks !

[port area]

For those interested vent area is related to the subwoofer parameters themselves and tuning frequency, for example here is the Richard Small's method for minimum aero port diameter, this one is based in tuning frequency and displacement (Vd):

Vd = Sd x Xmax

Minimum aero port vent diameter = 39.37(FB x VD)^.5

Then there is the vent mach method which is based on acoustic power and tuning frequency (neither is there agreement in what fraction of the speed of sound should be adequate for a port,,winisd puts it at 15% but many people say it should stay below 5%).

Unhappily is very common to find companies listing incomplete specs like DC audio, AQ, and Sundown.

hey man, could help me in this calculation? I live in Brazil we use standard measures other than yours, what would be the ideal port for two sub Fosgate P3?

VD = 570cm² x 1,5 cm

Fb box = 30hz

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[my humble sound !]

New ..

[my humble sound !]

where is the other 2 woofers?

This picture was before some current changes

[my humble sound !]

[screw and boners?]

Thanks again!, Here in Brazil, we have projects SPL a bit different from what I see here. I created a topic in a forum here in BRAZIL. (http://autoforum.com.br/index.php?showtopic=167105)

We will be happy to help, as you helped me!

[screw and boners?]

lol. thanks! and apologize for errors in translation ...

[screw and boners?]

Guys have to come some time developing my project SPL. now almost in the final I came across a doubt. what kind of decision to use?

I am very influenced by the projects of Steve Meade, something I shaman much attention are the boxes with threaded rods to avoid vibrations.

And here what else strikes me the screws instead of the traditional outlets

In my project using cables to each sub 6mm (4 pioneer 309), IRAM they unite in a terminal lug inside the pier just past out to screw as in the examples above, this screw (outside) to the module using vo 16mm cable, plus there is a doubt use a bolt as in the photos above I'm going to have loss of power?

Taking into account that a bolt of pure copper and very difficult to find. I will lose power by placing a screw joint of steel?

What else interests me there is beauty that does not suffer from loss of power. WHAT do you think?

(excuse my mistakes, I'm braseleiro, not in English)