SPL & SQ / Fabrication

Im pretty sure Ive seen this before. wondering how the port length is calculated. say the port opening is 3.75x13, Id assume when it splits Id make each continuance of the port 1.875x13. do I measure the length of the first part before it splits, and add to it the length of the part after the split to get the overall length. do I calculate the length as if I were running 2 1.875x13 ports, or a single 3.75x13 port. with the box volume and tuning I was using, they were very similar, 29.6 for one and 28.92 for the other scenario, so either one would end up close enough, but Id like the know the correct way. if either of these are correct.

Hi, I am just about to start my build in my explorer and I have a few questions. I will be running Phoenix gold rsd 6.5 components in the front doors, Soundstream pcs.6.5 3 ways in the back. I have a kicker zx650.4 now the question is what is the difference between active/passive? and do I have the option to do the better sounding one? Also the subwoofer box I will be building I want to put the port inbetween the 2 subs but I don't know how to calculate it that way. Any info would be greatly appreciated.

I need advice on where to face my subs. my current box only fits one way. facing back, it is in a 1996 geo metro and was wondering us anyone had experience with subs back in the hatch. Thank you very much

im getting my system installed next week. Am i going to get bored of it after a while? Will it not seem as loud as it was when i first put it in because i got used to it? I am going to run 1500 watts rms. i have a sundown sae 1200d, 12in fi bl fully loaded, 0 gauge amp kit, and im going to do the big 3 upgrade. This is all going in a 2010 maxima

I'm currently thinking about building a box for a 12 btl with both the sub and the port aimed into the cabin, sealing off the trunk from the cabin. I have looked at tons of boxes doing this but they all port on either the right or left side of the box. I often have 4 people in my car so this would mean the seats would have to remain up giving the port very little room to breath. My middle seat has an arm rest that comes down and my idea was to have the box port right there so that i can just put the arm rest down and give the port a place to breath. My question is can i port the box in the middle and place the sub to either the right or left of the port. I don't have a i…

i just went to my first sq event this weekend and the advice i was given by the judge is to try and widen the soundstage a bit along with getting the image a little higher. i sorta noticed this before but not really so brushed it off but after listening again post judging i could definitely see where he's coming from. he said its slightly above the a pillars and slightly wider then the car but needs just a little more. I listened to hotel cali again along with some michael jackson on the way home and noticed this 100%. any advice on how i would do that? Pointing my drivers side tweeter up helped a lil bit on some songs but I'm pretty sure I'm lacking some midrange up high…

trying to decide on 2 different setups and basically, if you like loud (40hz area) but also don't wanna lose that low rumble in the 29-32hz area, what setup would be ideal? all ran off of a 5,000w amp 3 12" Fi Qs(BP option mandatory) Sealed in 4 cubes. 3 10" AQ-HDC3s ported at 37hz. I know that the 10s are louder but i have never done a setup of this magnitude and am wanting to know really, for someone who may have done something this loud before, what is your opinion on this? I know the sealed setup, i can get my lows just fine, will not be as loud as the 10s but is it gonna be very noticeable? Basically, i can give you a scenario- If i set SSF to let's say to start roll…

Are there any pros and cons of having ports firing: the same directions as the subs, 90 deg off the subs, 180 deg off the subs?

Im thinking of wallin my truck (2000 gmc Sierra ext cab) and dropping another death penalty in there. But I have some questions. What is the best side for the body or dead center? Also would the area around it have to be completely sealed or can there be gaps along the sides behind a beauty panel? Do I double the port area? And will this affect sound quality?

My buddy is trying to put a 18" fi ssd fully loaded in the back of his eagle summit van.. He has about 1200 watt rms of power to run the sub.. There is two different set of max dimensions we can use ( it all depends on how tall the box will actually be. The first set is a tall narrow box and our max dimensions are 27 1/4 tall X 39 wide X 15 Deep. And the other set is 20 1/2 deep X 39 wide X 21 tall. Any help would be wonderful... Would really like start build on box as soon as we can.. Also I would like it ported wit a tune right around 32 hz. And I not sure wat would sound best wit the speaker direction and port direction so any advice is wonderful.

Hello, At the moment, I have 2 Kenwood 12's (4 Ohms, 400rms) in separate ported enclosures that I built. It was my first time building a sub enclosure, and I don't think I did it right. I have an alpine MRP-M500 amp running at 300wrms at 4ohms. I listen to rap, and when I play a song that goes really low (Put on- jeezy for example) the lowest note is really quiet. I'm assuming its a combination of the wrong box specs and them being underpowered? I'm planning on getting a new system in a couple months, but until then, I'd like to fix my current one and in the process, I'd be getting another box build under my belt to practice for my next one. My goal is to make it louder,…

I'm about to start building me a new box and I was thinking of bracing it like this 2x4's & 1.5" dowel rod What do you guys think?

I have a non wall box for a 21 warden going in a 2 door blazer, I have two boxes saved as a design right now. Both are about 8cu after all displacements and have 120-130sq in of port. The box is set up for sub up port back. My question is, would having the port on the side vertically facing the hatch make any much difference then if the port was on the bottom running length wise horizontally facing the hatch. I know each vehicle is diff and theres no telling whats better, but figured maybe the way the air moved would be diff or somthing. Thanks for any help

Okay so I am new to this. I am going to be building this in the near future and the hard part is that it's for a regular cab short box s-10 pickup. I do not know if i should go with a "blowout or just put a topor on the truck and put the sub in the back under that. My plan is to run a 2 F.I B.T.L 15" To a Audio Que 3500 H.D Running 1 ohm Power @ 18V** @ 10% THD 7500W x 1. I am trying to find a descent sub box to make up for this. And i have a couple ?'s Like i said i am new to this so am i going to need to push some more power to these beast's or is this going to be enough i mean i want something that is going to wake you up not put you to sleep. Am i going to have to d…

ok so im ordering a z15 hopefully tomorrow if my dam taxes show up and i would like to have the box built and bolted in my car b4 the sub arrives. now my question is should i go sealed or ported to move a ton of air and have alot of feel to it? btw its going in the backseat of a 76 caprice. and the next thing how can i get box dimension? sealed wouldnt be hard to figuer out but if i should go ported ill need some assistance. recomended sealed is 2.5 cubed and ported is 3.5 cubed tuned to 30 hz. thanx in advance for any help

Hey guys. I recently completed my build using an IA DR12 in 2.2 cubes at 31 hz. My port area right now is 25 in^2. I do get a some port noise on the lower notes in some songs. I was just wondering if I should rebuild a box using more port area. Just not sure if it would make a differance or not. It gets plenty loud right now, I just have had a "what if" idea in my head since I noticed it. Any input would be great. Thanks Tony Nelson

Hey does anyone have an SPL meter that they are selling? Or does anyone have one that lives near Akron or Cleveland Ohio that you could meter for me? I'd appreciate any help. Thanks!

Wonderin whats.better for 4 12 sa's d4.They will be going in a 99 crownvic.thank u in advance

What makes this sub the happiest on daily?? It will be built out of birch ply, fed about 2ooo watts and space isnt a issue.. helps appreciated.. Im not asking for a box design, just what volume and tuned to what, I can design.. Thanks in advance..

I have an 05 denali and want a 5 cu ft. box made. I went on re box calculator and my measurements I typed in made the box not square. Could someone give me a hand and give me some dimensions or a drawing???

Ok I am doing a box for 4 fi ssd 12's. It will be 8 cubes after displacement. I need help with the port tho. I am wanting to tune to like 35htz. I kinda want to try flared aeros but don't know what size or how many. Can someone help me out. Also need help with the length

what would you guys prefer to use to smooth out the corners inside a box, putty or bondo, (and which brand) I might grab some resin and hardener for my RL-p box, I want it perfect before the RL-p goes in, I shold probably do some more internal bracing to make it as stiff as possible to preserve as mush SQ as possible

First off, i know i already posted this in general car audio, but i just wanted to get as many opinions as possible, and i always seem to more replies in here than anywhere hahah. Sub: Fi BL 18 with flatwind and p chamfer Amp: Hifonics bxi2006d (again, its not sundown or anything, but it should get the job done for now and even if it is overrated, i think 1800 should push a bl just fine. Wiring: Knuconcepts.. look Not included in the kit are RCAs and the speaker wire. Also should i get 10 or 12 gauage, and what do i need to fit it into the terminal on the sub? Enclosure: 6^3ft after all displacement and port, and tuned to 34.4xxx hz. I guess what i'm looking for is the O…

currently i have a 2.5cuft box tuned around 33hz with a 1300.1 percision power amp running at 1 ohm. i have just installed a pair of polk components in the front with a powerbass 2ch giving each side about 100rms. so now the sub isnt the main part of my system like it was before when i only had 30rms to the front doors that would get un audible when the sub hit. the idea for the new box is about 4cuft tuned around 28hz or so. my biggest question is how big should my port be? what are the advantages of 12" vs 16" per cube? would 12" be more snappy vs a 16" which would move more air? currently the box is directly behind the drivers seat with the sub and port facing the dr…

I just purchased a SSA Xcon 10 and will be putting it in my 350z. My question is.. Would a premade enclosure from "Zenclosures.com" be fine for it? Heres the link to the enclosure http://www.zenclosures.com/Nissan-350Z-Subwoofer-Box-p/z110ar.htm Any input would be greatly appreciated! Kyle