Let's say I use one of moe's plan, that has lets say a 30" port length. Can I take that port length and cut it by 2 resulting in two 15" long ports. Would that work?
-James
Hand/Ear Coordination
Let's say I use one of moe's plan, that has lets say a 30" port length. Can I take that port length and cut it by 2 resulting in two 15" long ports. Would that work?
-James
OG
Sorry. That doesn't quite work that way. You essentially get double the port area, so length is going to have to increase in order to keep tuning the same. I believe that, now I may be wrong, length would approx. double.
Ride: 1993 Mazda MX-3
HU: Alpine CDA-9853 with KCA-420i iPod InterfaceFront Stage: Pioneer Premier TS-D602P
Sub Stage: TC Sounds LMS-R 15 Dual 2 in 4 cuft. box tuned to 24hz
Front Amp: Precision Power PC2400.2. 100rms x 2 at 4 ohms
Sub Amp: Powerbass XA 1500d. 1500rms x 1 at 1 ohmRefs:Sold to: 99StangGt, Kagymp5, DMDAKOTA, Snozzer, spljunkiems, jblanford, 98dodgestratus, stishdr, kombat96Bought from: allenzo, BreakMyWallet, pickup1, defj, select127
Hand/Ear Coordination
man... only if it was that simple.
CarAudio.com Elite
**** that shits confusing
CarAudio.com Veteran
oh so what is the formula?
REFS
blackgeltabs, theCybe(2x), xplcitcustmz, mabel4life, bumpn_gt , PENER, BLD 25, j3bus2k3(3x) , PRIVATEpastry, guy022077(3x), alpine3612, 03tibgt, rocky 59, mattmcss, yotabeater,pepsican, iceteebone(2x), sfsloop @ mac. com, vincemarq, maldecido33, dalucifer, BassAddictJ, thakidgame, Scoobydoo, marcusb419er, nVRuckus, frkkevin, killahbean, CBFryman2, Zeuslicious(2x), bizzy07, expo5.0, dragonrage, 1loudsuv, nismos14, James Bang, mtlhead, Rsx_03, thaster, teamsubgopoof, CRAZYCORNUTS18, ggk, Colt9699(2x), thangalang, BloodStalker999, dwaynem, chaunb3400, volstitan908, blackbonnie, Fast1one, nineball, rbiele126, JayRich, Al_Capowned, runwitbass
Hand/Ear Coordination
i dunno. I just thought that a 2 slot port would be ****.Originally Posted by dleccord
OG
Well, if you're dead set on having two ports, you could always divide the port area on each port.
Lets say your port calls for 30sq inches. Hypotheticly(sp), you start with a port 3"W x 10"H at a length of 20". In order to keep the same length per port, you would have to do a pair of ports at 1.5"W x 10"H, each with a length of 20". I am almost positive this is how you could do it.
PM a box designer like PV Audio or Moe Lester if this is all too confusing for you still. They know more than me.
Ride: 1993 Mazda MX-3
HU: Alpine CDA-9853 with KCA-420i iPod InterfaceFront Stage: Pioneer Premier TS-D602P
Sub Stage: TC Sounds LMS-R 15 Dual 2 in 4 cuft. box tuned to 24hz
Front Amp: Precision Power PC2400.2. 100rms x 2 at 4 ohms
Sub Amp: Powerbass XA 1500d. 1500rms x 1 at 1 ohmRefs:Sold to: 99StangGt, Kagymp5, DMDAKOTA, Snozzer, spljunkiems, jblanford, 98dodgestratus, stishdr, kombat96Bought from: allenzo, BreakMyWallet, pickup1, defj, select127
Hand/Ear Coordination
Thanks for the reply,
but. hmmm? isn't that just about the same as my theory of dividing the length by 2 but keeping the same width. wouldnt' that allow for the port area?
CarAudio.com Veteran
Nooooooooooooooo.
IE:
7cuft box
Port 5"X10" 20" length is tuned for 28hz.
Now go with 2 ports 5"x10" and shorten the length to 10" and now its tuned for 50 hz..............
Length corresonds to port area(for a tune feq.)the more area(bigger/more ports) the longer the runner needs to be(port length).
142.6@50 TL legal at me first meet.......
refs:Flakko,saywhat,mmata13(sold 1605D amp),nVRuckus(bought fuse blocks), dkguitarist(traded 2 amps),MikeyB(sold MD2),CBFryman2(sold MD2),gundecker (bought 20.1),Sakura (2 Trades),killahbean (bought DMX12),Loud3(Bought Fiberglass Kicks),tb2007(sold diamond amp),iamamp3pimp(bought box's 3 so far/sold 20.1/sold 2 L7s,ZX650.4),chillcat34433(bought 12"RF HX2), ultimate157(sold opti 2000D),bballrrt06(sold opti 2000D),GrnEydDvl(sold kx2500.1),BassAddictJ (sold kx2500.1),pwuthedon(bought Lanzar 4000D)
lostsoul (5.25 mtx comps) Bad once I hooked them up.....................
Keepin it Simple
splitting a port into two will lengthen your ports.
you could...
-divide your box volume by 2
-figure out the length of each port
-make the box with demnsions to account for the total port (and sub) displacement.
if you want your box to have an even look to it, you can just put the port in the middle of the subs. if you move the port from the wall of the box to the center, don't forget to add 1/2 of the port's width to its length. when the box is designed to have the port sharing an wall with the box, port correction come into play...which is simply taking 1/2 of the port's width off the end of the port, so moving to the center you will need to replace that 1/2 width to the length.
2006 Jeep Liberty
Adire Audio, Cadence, Clarion, MB Quart
Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
*Vb = vol. in cu"
**R = sq.rt. A / Pi (for square/slot port)
CarAudio.com Elite
My box is about 38" wide with 2 15" slot ports...not sure how they did it...but it works...it looks cool and sounds great..and adds stability
Hand/Ear Coordination
share some pix bud
Bass Heads Entertainment
what you can do is cut down on each port size. lets say your box is calling for a port that is 4x12 inches (48 sqin)
you can make 2 12x2 inch ports there fore resulting in 48 sqin of port.
but you wil have to take into accound the airspace taken up by the additional wood from the port walls, and ad that into the equation as well, but personally, there is not that much difference.
www.BassHeadsENT.net for all your custom enclosure needs
Offering build service and expertise in the Tampa area as well as enclosures shipped nationwide!
Robin@BassHeadsENT.net
Check this thread for all the build logs being posted.
http://www.caraudio.com/forums/suppo...ks-thread.html
Keepin it Simple
yes, you can, but you will need to re-calculate because the port length will be different, it will end up longer...that's where i was going with this in my previous post. simply splitting 1 port's area equally into 2 ports will not create the same tuning freq. because the length will need to be changed as well.
the box was designed to have 2 ports.
2006 Jeep Liberty
Adire Audio, Cadence, Clarion, MB Quart
Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
*Vb = vol. in cu"
**R = sq.rt. A / Pi (for square/slot port)
Posting Permissions
 |
Bookmarks