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Port style info needed please.
Port style info needed please.
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Old 6th April 2013, 10:20 AM   #11
FoMoCo is offline FoMoCo  United States
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Join Date: Dec 2012
Originally Posted by OscarS View Post
I think you took that much too literally, for there is validityin my statement
Okay. Then explain how the statement was valid.

Originally Posted by Ron E View Post
Bigger diameter (area) is always better in ports.
I've always believed this too.
Account Deletion Requested: 1/26/2014
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Old 6th April 2013, 03:25 PM   #12
CLS500 is offline CLS500  United States
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Join Date: Feb 2011
Location: Grapevine TX (Dallas/Ft.Worth area)
As this box is kind of a thin rectangle would it be OK to offset the speaker to the left on the front baffle and run the 4" tube in from the right side of the box (looking at the rectangle front on) ??? Plenty of room to use a 4'x14" straight flared tube if I bring it in from the side. Does it make any difference which side the port comes in from??(will probably use a flared tube kit from PE for this)
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Old 6th April 2013, 03:44 PM   #13
OscarS is offline OscarS  United States
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Join Date: Jan 2011
Originally Posted by FoMoCo View Post
Okay. Then explain how the statement was valid.

I've always believed this too.
like RonE said, the bigger the port area the better. this was the part about "minimizing vent mach speed". The part about minimizing internal surface area was to remind the OP about the losses that occur when two Ports of equal cross sectional area but unequal internal surface area are compared---there are more port losses in a high aspect ratio rectangular port than a square port, and similarly more losses in a square port than in a circular port (for a given cross sectional area). the circular port minimizes internal surface area for a given cross sectional profile.
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Old 9th April 2013, 06:22 PM   #14
head_unit is offline head_unit  United States
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Join Date: Feb 2004
Location: Los Angeles
Originally Posted by anwaypasible View Post
go to your local hardware store and put a piece of pvc pipe in an elbow and see if it lines up smooth on the inside.
you might be surprised at how smooth it can be
Yes, that is a good point. I guess the word "elbow" sets me off because I often see it in a context where someone is gonna make a 90 degree sharp elbow out of wood.

I think a shelf port on another side is still preferable, but if the radiused elbow enables a larger port area then it could be a good solution.
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Old 9th April 2013, 08:06 PM   #15
anwaypasible is offline anwaypasible  United States
Join Date: Aug 2007
oh i think most people growing up heard ports tuned at high frequencies and they don't ever get to see the value of a belching extension.

instead, all of the ports are setup for the low bass extension where the box doesn't have any compression & it requires a smaller amount of power to get the speaker to move .. yet most people aren't using the equalizer to boost the frequency any , thus the possibility is there & nobody hears it or knows it.

go to a place like best buy and fire up the demo speakers in the ported box and they might as well go no lower than 40hz
the same thing stupid 2-way speakers can provide, except much louder.

then to make matters worse, they leave the low pass filter up high.. so the subwoofer doesn't sound like a sub woofer , it sounds like a woofer playing really loud.

then, with that inertia, their mentality makes the claim 'well they are advertising we can & should listen to it louder .. why not upgrade the door speakers and put in some amplifiers for them to make the whole thing louder?'

and i'm jst banging my head thinking 'whole thing?!! you haven't heard bass extension or a flat frequency response yet'

then i could go on about phase mismatch and time delay adjustments needed too.

it's like the industry tries to get everybody to sleep with the most ugly mate with healthy reproductive organs as mentally and|or emotionally possible.
and for what? because it saves beauty?
there won't be any beauty left if it stops being born..!
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