Sub Box Porting
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peetie87
Posts: 6
Hi. I recently purchased a dual sub box (http://i12.ebayimg.com/05/i/06/5e/c9/44_1_b.JPG) for my GNX-104 subs and i want to make the box ported. Where should i put my ports on the box? I am going to have the box positioned so the angeled side is facing up (subs pointing up). Does is matter where the ports go? Polk reccomends a 3"wide x 8"long port for a 1.25 cuft box and the box i purchased is two 1.25 cuft chambers. I was planning on purchasing 2 of these port tubes and cutting then 8"long (http://cgi.ebay.com/3-Wide-Nickel-Port-Tube-12-Long-Cut-to-Size_W0QQitemZ5859074686QQcategoryZ14932QQssPageNameZWDVWQQrdZ1QQcmdZViewItem). Are these ports a good choice? Does it matter what material the ports are made of (ie plastic vs. metal)? Please let me know -Alex
Post edited by peetie87 on
Comments
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there is a small problem here - when you actually put the ports in, then put the subs in, the actual volume is rather less than 1.25 ft^3, which will affect the tuning... what i'd do is put the ports in at full length as a trial, then trim them back bit by bit till you like the sound (where a 'bit' is 1/2 inch at most)... this is annoying, but if you cut them too short, you're screwed until you get new ports...
and no, the material doesn't matterIt's not good, very fundamentally simply not good. - geolemon
"Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs -
ok thanks. What about location on the box? Does this matter?
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yes.peetie87 wrote:ok thanks. What about location on the box? Does this matter?
(I'm channeling Cody here with my one-word answer
) http://www.silverdragon.com/punkie/cybertusk/net.idiot.html - Read it, know it
Alpine 9815
Polk MM6's in custom fiberglass door pods
Ascendant Audio Atlas 12
HiFonics Zeus ZX6400 - 85x2 + 350x1
2 Gallons SecondSkin Spectrum V.2 -
it can, yep... this will add a whole new order of magnitude to how annoying the initial set-up will be... because every time you take some of the vent off, you'll need to try the box (with its new and hopefully improved tuning) in each position in the trunk that you'd consider... so if you have three positions in the trunk (say, left, rear, and right), every time you trim the port, you need to listen to the box in each of those three positions...peetie87 wrote:ok thanks. What about location on the box? Does this matter?
this is the most thorough way to do it, but also the most time consuming...It's not good, very fundamentally simply not good. - geolemon
"Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
