SPL & SQ / Fabrication

I am new and am designing a ported box, it is 4.1 cubed inside for 1 15 and i want to tune low. how big should the port be so the air speed is not too fast?

I have been searching around and just can't seem to get a good enough grasp on these so hopefully somebody here can help me. I'm building a box so after the displacement of everything it will be 3cuft. I will be running two Audioque HDC310s D1 and want to tune the box to 35 hz. So my question is how many ports? How long? What diameter? I just don't want to screw this up and have port noise or inefficient ports. I was also wondering if I could just get pvc pipe from a local hardware store and use that and buy some flares online to save some money. Thanks in advance!

So I hate posting help ? On here but here I go again....can some body help me find how to bring down my box rise I will like to get as close to 2 ohms as I can....right.now I rise to 3.5 and I was searching on here but cant find nothing...I no bracing and better airflow accounts so I just need to be pointed in the right direction thats all

seeing that SQ is subjective to the person lisening, I have redefined SQ: 1. Having Quality speakers, able to be clear enuff to sound good over subs doing 152db Daily 2. having an amp ablt to push that set of mids & highs without distorting. 3. Hu has to have SQ Freq control features feel free to add to the list

Any competitors with a trunk here? So far I am at 147.4 legal on the term with no testing and a box with the wrong tuning. Anyone have an tips/hints?

I was installing a simple Hu in a 2006 Sonata and the four screws that hold the oem radio in WILL NOT turn. I can usually do it with my trusty screwdriver but no luck. So I got out our 14.4v Black & Decker with a mostly charged battery and it couldn't turn them either. My dad says I need to drill them out but I'm not sure how to to that. They're semi-stripped now too so yeah. Any help would be appreciated.

I need some help would u guys recommend a figerglass box and mdf or jus an mdf box I don't know much about mdf an fiberglass boxes it's for an 18" btl

the 4 ft will be below the windows, and the 6 will be above the windows. the 6 can be plugged to ~7ft @ ~32-34Hz w/ ~ 75^2 port. the other one i haven't sat down to figure it out yet... i think i wanna go under the window if i do decide to compete, cause i don't know how well i'd do in the higer class what you guys think?

I am wanting to add more low end to my truck and I think I have decided to do a rear console. But I dont know which way to fire the sub or subs. The box will be roughly 2.4cu and is 14x28x14. This is going in a 07 Harley F250. Here is a few pics of a cardboard make up box. So should I do one 12 rear facing and ported or do 2 10's or 2 12's down firing sealed? If I do a down firing box it will need to come up 2-3 inches so it would be alittle higher than pics. The box will be black carpet to match. Looking for hard hitting low clean bass. I could maybe get another .5 if I slope the front and bring it down. Looking at either SA-10's 12"s or SSA Dcon or ICONS and a SA-1500…

Well, here's the deal. I'm going to be building a box for 2 Fi Bl 18's. I figured up the box will be 11.27 cubes before displacement, which is about 10.81 cubes after sub displacement. I figured that I will have 158 sq. inches of port area total. The question I have is, since I want to tune the box to 34hz, how long do I make the port? The port will be 44.5" wide, and 3.55" tall (inside measurements).

here is a link to some tables, but I would really love to build a TL or Snail Shell box soon to put a small sub in http://www.quarter-wave.com/Theory/Alignment_Tables.pdf

In this weeks episode I review how you can create a false wall in order to further complete an install. Using a false wall can allow you to utilize an enclosure that is simple, but yet obtain a finished product that looks very custom and integrated within the vehicle. I would love to know what you think! Thanks for taking the time to watch! (Click the picture for the video) ~Mark

I was looking around at how I could go about finishing my box. Now this is a 10 cube box, but fully square. Since its MDF I would think it would be hard to paint. So I was searching and came up with four things I may be able to do. Spray/Roll on Bedliner(not sure if it's the same as paint), Carpet Wrap, Fur wrap, or Vinyl Wrap(hardest) Now I have no upholstery expirence so wrapping my be a task, but it looks good when done right that's why it is a option.

Is it possible to wire in multiple computer case ball bearing fans in my car? Is it a matter of taking the black wire and grounding it, but the red power wire, can i just wire it to my distribution block? How will i deal with the voltage? Thinking about mounting amps in a long thin enclosure with plexiglass top and have the fans suck in air on the right side and have the fans suck out air on the right side for ventilation. Maybe ill throw in some neon lights to make it look good. Is this just a pipe dream or can it be done? Any help would be appreciated. TIA

So, I'm set out to make a ported box for one 12" SSA DCON. I looked at all the specs, and here is what I have come up with: Width - 30 in. Height - 14 in. Top - 12 in. Bottom - 16 in. Wood - 0.75 in. thick Square port width - 1.5 in. Square port interior length - 9 in. This puts my Interior volume at 2.311 ft^3, and the tuning frequency at 28.28 Hz. This is about the best I can do with dimensions that can be easily cut, and that will fit my Scion tC. Do you guys have any suggestions? This is my first box I will be building, and I know all about the supplies, I just need to learn more about the dimensions of box building, as well dealing with the ported vo…

So, it's getting near that time of the year.... I'm trying to figure just how I'm going to make it to finals this year... check out the sights, installs, and meet a few names. What better time then World Finals? So, dBDrag Finals are Oct 7-9 in Cleveland, OH. I'm definately going to be able to make it here, it's only a 3 hour drive for me. Meet shane, tottie, nick, loyd, tom, pete, iggy, and so on. Anyone else going? So, Usaci Finals are in Kansas City, MO Oct 15 & 16th. I'm going to try to make it down there, as I can get flights for ~$250 so far. Meet Matt, Mike, Justin, so on. Anyone else going? -Nick

I should be seeing a Orion HCCA 15 pretty soon and I'm going to want to build a box for it. I found the instruction manual and my dumbass can't see the inner port wall (L shape). I'm cutting pieces of paper pretending its the box but I'm still lost. I'm sure I'll be laughed at but still. http://www.directedd...08-11MLweb2.pdf I'm looking at page 30 in link. Thanks for your patience.

My goal this yr. is farely ambitious. I want to post the loudest Trunk score in DBDrag. This is not gonna be an easy task by no means. Thier are some seriously big shoes to fill following in the likes of Dave Dasilva, Mike Stiers, Don Doyle, Steve Sears to name a few. I will have to achieve at least 154+ to achieve my goal. My starting point See ya in the Lanes

I've been trying to decide if I want a single Din, Double Din, or possibly Car PC in my truck but I think the question can really only be answered after I decide if I want to go 3-way or 2-way Active. I have now currently installed one 2-Way Active setup ran by an 880PRS so that is my extent to an active setup. I have been told to do a 3-way I may have to go with a robust 7 instead of an 8 but would really prefer squeezing an 8 even if that means a custom door pod that I have seen made. I have no problem with using the kicks or glassing as well So I'm really looking for some Pro's and Con's between 2-Way and 3-way. The more I think the more I really just want to go all ou…

can i make the wicked one to house a single 15"? is so how??

Curious, as anyone else seen a lot of box builders and designers using aero port areas equivalent to square or slotted port area? I was under the impression that the agreed upon rule of thumb was that you can use .56% less area while achieving like results. Within this practice, I find myself believing that if one were to use equal, that in theory, they are increasing their port area by, .56% I also lean toward this thought, if you correctly designed your enclosure and its port, based around the mathematics and t/s parameters of your driver, and chose to not use the formentioned rule of thumb,when using an aero port, that you have given too much port area to your design…

just like to say that my little boy will be in the lanes this year. he's 5 yrs old and going to compete in the mini SPL cars. so hopefully we'll be finish with it in about a month or so. wish him luck jamie

After comparing torres to the RE calc, I realized that it was off (re) by a lot more than I had expected. About an entire cubic foot off. So I think now would be a good time to build a new box. The main question I have is in reference to the "Port Top/Bottom" measurement, I'm not sure where the 4.50" comes from? I'm also not quite sure about how a slot port with no bend's would act since I don't think i've seen many people build one without bends. Main goal is to have the Hifonics brz15 laying face up and the port facing either the trunk or in the cabin, and to be removable (the box). Are there any real advantages to an inward facing port? I've heard that you would want y…

Hi guys, I drive an SUV for the first time, with enough of trunk space (for the first time of my life) ! It's a Mazda CX-5 (2.2 l diesel with 150 hp) : I love it hopefully :-) :-) I will use my Zcon 15" on an IA20.1 amplifier. I think I'll do sub up. But how to put the port ? Port up or port to the rear ? How much room is necessary between the port and the rear hatch ? Is there a maximum ? If I put it firing back, what would be good and why ? Port standing on a side of the back panel of the box, or laying down on all the width ? I see both scenarii for SUV generally. I'll take some mesurements later. I think I can easily run my sub in a 4ft3 net enclosure, in this…

This post is going to be a little bit technical, but since most of you are more "technical" than I am, I'm sure you can handle it. I need help setting up my amps, and more specifically setting my amps' crossover frequency cutoffs. I understand if nobody wants to take the time to reply, but I'll just throw all of it out there. First, my setup. Some of you have probably seen my installation log (and my sig), but I'll lay it out more specifically here. I will be installing my amps very soon, and need to set all of the dials before I screw them into the amp rack. Amps JL Audio 500/5 (for front speakers and sub) JL Audio e2150 (to drive my rear fill only) Speakers Fronts:…