min. port dia. for dayton dvc 12" sub? (1 Viewer)

[steve all]

hi, i'm planning to use the dayton dvc 12" sub for my project. their catalogue shows box volume to be a little over 2.5 cu ft. the port they say should be 2"x5"x14.54 i asume, they are talking about building a rectangular shape port maybe, out of some extra mdf board am i correct on this? also, can a 4" round vent be used instead without risk of extensive port noise? i'm also concerned that 2.5 cu ft. might be too small? just want to avoid building nothing more than a boom box considering, it's mainly for music but, will be used for HT also. has anyone built the box they recomend in their catalogue with the rectangular vent? if so, how does it perform with music/HT and how about spls. this is my first diy sub, i'm just trying to come up with something better, than the cheap $200.00 comercial subs on the market. appreaciate any help, thanks steve all

 

[Robert_J]

Yes, a 3" or 4" flared port can be used with very good results. We're also talking about this same driver here.

-Robert

 

[steve all]

hi Robert, thanks for the info and link that helps alot. i'm new at using the WINISD PRO i think i came up with 3.25 cu ft box tuned to 22.79hz if i did it correctly? with a 4"x 17.71" port so, i guess i'll have to just use 4" plumbing pipe with an elbow. would the 4 cu ft. cubed box be fine or, should i add a little extra volume for amp, port, speaker, and bracing? or is that already figured in. i wanted to put port in rear in case of port noise but, it has to sit right in front of my entertainment center and would be too close, darned mobile homes he he. i guess i'll put it in the left side instead of the front firing right at me as there will be nothing in the way on the side of box. thanks again, steve all

 

[Robert_J]

As a former resident of a manufactured housing subdivision, I understand completely.

-Robert

 

[steve all]

hi Robert, that's a really good article on installing a port i think i'll try that. i know how to calculate square objects cu in and ft just not sure on driver maybe, ican find some displacement values on some other brand drivers with about the same dimentions as the dayton dvc 12" #295-185 driver. the plate amp, PE 240 watt model i figured to be about .2 cu ft. displacement volume. i guess on the port, i could figure it as 4"x4"x length as if it were square and maybe be close enough. i'll get started figuring how much to add to box volume. two other box calculators by, qts,fs,and vas specs alone, came up to about 3.6 cu ft. so, i guess i'll aim somewhere between there, and the 4 cu ft you mentioned which also, models pretty good in WINISD. really appreaciate your help reguards, steve all

 

[johnBee]

Steve, the Dayton DVC should be around 3ltr.

 

[steve all]

HI johnBee, thanks verry much for that info steve all

 

[Robert_J]

The forumula for the port is:
Pi*r^2*L
Where:
Pi=3.1459
r=radius (2" in this case)
L=length

-Robert

 

[steve all]

hi Robert, thanks for the formula to calculate the port volume i'm not familiar with this type of math but, i tried calculating for a 15.26" port length and rounding the results, i came up with .11 cu ft. one of my daughters is pretty good with math and i'll have her check my figures when she comes over. i sure do thank you for all your great help! thanks, steve all

 

[steve all]

hi Robert_J, i think i might have found a better deal, on a shiva 12" DVC instead of the dayton dvc 12". what are your thoughts on the shivas? the shiva costs $6.00 more but, has free shipping but the dayton does not. reguards, steve all

 

[Robert_J]

In blind listening tests, you probably couldn't tell the difference between the two. The Shiva's Vas is higher so it requires a slightly larger box. On the other hand, using Adire's application notes will be exact instead of "really close".

-Robert