dual powerport CSi40

[eaadams]

I see on the back of the CSi40 there are two powerports. What effect does this have on bass? Did the CS400i have dual powerports? What does the CSi5 have?

[del44]

I have the 400i and it has only a single powerport.

[Mjr7531]

However, two powerports as like on my CSi5 effectively double the pot cross area, keeping the actual port diameter down on both ports while reducing the possibilty of chuffing,
Matt

[eaadams]

What is pot cross area?
What does it mean to keep port diameter down?
What is chuffing?

[eaadams]

chuffing
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A characteristic, low-frequency pulsating noise associated with the irregular burning of fuel in a rocket engine.

[VR3]

Chuffling is port noise basically, air created at the port...

Port diameter down - make the diameter of the small smaller (width)...

[eaadams]

does a smaller diameter make it more punchy? Or is it just a reduction in port air flow noise?

[VR3]

Actually, the LARGER the port = less port noise, so I dont see why they would make the port small, the power port holes are only like 1-1.5" wide anyways...

[Mjr7531]

Originally posted by eaadams
What is pot cross area?

I was tired that night, sorry
I meant 'port'
And larger diameter is great and all that crap, but the bigger the diameter, the longer the port tube, and you need to keep the port at least 3 inches from the opposite wall, so problems would be encountered if they widened the ports too much.

[EricH]

Ports must be large enough to eliminate chuffing, but not so large as to throw off the tune of the speaker. Speaker designers balance port tube length, diameter, internal speaker volume etc. to tune the speaker. Two smaller ports do the exact same thing as one larger port.