SPL & SQ / Fabrication

can I make a port in a shape of a L and still tune the box too 35 hz. your advise is need badly

I'm trying to figure out my next box. The program I'm using is tells me that my port will be 5Tx10Wx17.5D. Now how much of an effect will it have if I was to change the opening to 3.5Tx11.5Wx17.5D?? I'm looking to tune it to 34Hz. Thx from the help.

I have 2 9515 DD's and I am building a new box. I need 75 square inches of port area. The square port I was going to use is 5 x 15 and is suppose to be 13.75 long. Do I measure the port from the front of the wood or the back? Also how far should my port be from the back of the box? I was thinking I might have to turn the port to get the length I need. The box inside measurement is 16" so the only would give me 2.25 inches from the back of the wood and 3.75 from the front.

Why is it bad to have the height to width ratio larger than 1:8? I made a box that is too small.... and thats the only i really can make my box tund low enough... i fucked up and now im out 2 sheets of mdf and a lot of time and effort... damn..

Is it possible to to a T shaped slot port? I'm designing a box right now with 2 woofers and no divider. I was planning on making a L shaped slot port off to one side of the woofers, but got to thinking about putting the port in between the woofers and making it shaped like a T without a divider in the middle. No clue if this would work or if the velocity of the air coming from each side would create turbulence where they meet and make the port less efficient. I would put a divider in but I'm limited on space and a divider makes the port length longer per side and cause me to increase the size of the box to stay optimum and the dimensions are larger than I have to work wit…

hey im workin on my third box build and i want this one to be perfict i need help on the port i wanted it tuned too like 33 htz and i dont know how to caculate that can anybody help me if i give you box demention and mdf thickness ???

K, box dimensions are 35x32x16 externally. Internally this gives me roughly 8.57Cubes. I want to port this to 34hz or so, and i need a min area of 6 cubic feet after displacements, is this possible? I also need to know how many sq inches of port i should need. I am just going to run out and grab 2 sheets of MDF right now so any help would be wonderful. The only confusing part is that the RE calculator keeps giving me ridiculous port lengths when removing the second portion of the L to make it a square. Any port dimension recommendations would be wonderful. Thanks in advance. Chris

I picked up a 1000watt amp and I'm getting two SA-8s, question is about the port size/length and whether or not to open the air space to both of them. Currently one side has about 1.4ft^3 and the other has .8ft^3. So if I open up the divider the overall airspace should be around 2.2ft^3. The recommended airspace is .75ft^3 per sub. I was thinking if they are separated I could tune one a little higher than the other and get a wider range out of them, or would they sound better in a shared airspace? Whichever is better I need advice on the port. I input these numbers on Port Length Calculator and came up with a 12" long port if I combine airspaces and use a a 4 inc…

A buddy of mine came to me the other day with 2 15s and wanted me to make a box that would fit in a 1999 Buick Park Ave. With a Height of only 14 inches its gowning to be a Wedge Enclosure. My ? is should i port the box in the front or in the back? The back seats do not fold down but in between the seats the arm rest folds down and gives a quick access hole that is 8 1/2 x 7 1/2 to the trunk. I was thinking of putting the port right there but im not shore. pic of trunk access hole http://memimage.cardomain.com/member_image...9377_5_full.jpg

I have a number of questions that I was hoping someone with experience can answer. I'm currently running a 15" BTL off 1600 in a 4 cube enclosure at 33hz. I feel like I don't have enough port area- i'm using one 6" aero which gives me 28" of port and 7" per cube. Do you think i'd have a noticeable difference by switching to a larger 8" port? I already bought the port, but don't want to destoy my old box if there wont' even be a noticeable difference. I'm hoping to achieve better lows...I figure that my larger port will give more output/peak at my tuning frequency of 33hz, hence giving me a better low end. In doing so, i'll also gain slightly more volume in my box (…

I'm afraid of my port being too long.i am by no means an expert but here is what I got... 1 team fi 18v2- 1 scv 4000 a couple of extra battery's 130 amp alt stock "mechman 270 soon" big 3-dual runs of 0 through out my box whic isnt built yet is 24t-24d-44w with a slot port 22.5x6" I'm wanting to tune to 28 for lows. I want it to be fairly loud but it's no big deal if it isn't I just don't want a boomy box tuned to 40 lol. Any way with a tuning of 28 and that size box I figured around 12 cubes before port-and with the port being 46 or so inches long I'll land near 8cubes after port. which puts me near 28 hearts or so... problem is with a port that long will I run into reso…

how small of a port tube can i get away with for a 1 cuft box? going to put a ssa dcon in it.

I have a buddy that got a got a box from another friend for free and we noticed the port area after the turn at the back of the box isn't as wide as the port at the front. The first length of port is 2.5" wide, and the second length is 2". Will this cause any major difference in sound? I'm guessing it will slightly tune it less at 2" than if it was 2.5" in the 2nd length. Example:

I know port tuning makes a difference. And I know what the differences are, but would there be an audible/easily noticeble difference between 30hz and 34hz tuning? For the larger amount of port area I want for my smaller box, I would have to tune around 34hz, instead of the 30hz I wanted to tune at.

hi, what is the rule of thumb for port tuning to gun for in SPL install? 45~48hz? cheers

I made up a few pages for port tuning, that account for port displacement, as I haven't seen anything online that offered it. Slot Port: http://portsgalore.stefanhinote.com/?do=portlength Aero Ports: http://portsgalore.stefanhinote.com/?do=portaerolength It uses the port length equation from the loudspeaker cookbook. Input: volume, port dimensions, tuning. It figures out the port length, and port volume (port length * port area). Subtracts port volume from original volume = net volume. With the found port length and net volume, it figures out the real tuning. From there it has something to start with, and starts adjusting the original tuning frequency until the net tuning…

Hey guys..I haven't completely started building anything just yet and this will be my first build and was just wondering about the port type and location of it and the subs. I don't have any exact dimensions or anything just yet just need to get a simple idea first. I have 2 T12's (rockford) in a prefab box now and wanted to make an good box for them. Any idea's on port type, sub and port location would be appreciated. And any first time building tips! I've heard a lot about subs up and port back but not sure if anything else would sound better in a hatchback. Thank for the help in advance, Ted

Where should i put the port? This is going to be in a blazer, and if back how much room should I leave between the port and tailgate?

I don't fully understand Port Velocity. Using BBP I can figure the velocity but at what are the acceptable limits prior to encountering negative effects?

I have always been a sealed box guy,so I have NO idea how to tune a box. That being said,how much port do I need in a 1.25ft box with DCON 10????? Will be for daily use playing mostly rock/metal. I was thinking 40-45hz maybe? Please correct me if I'm thinking wrong.

My car is a dodge charger,my system will consist of 2 12"subwoofers maybe "maybe 15 inch woofers if they fit.my two extra batteries can go in my spare tire area and my amp can be mounted on back of my seat.my woofers will be running off a saz3500,my question is will my setup get way luder if my box ports through the rear deck?or shold i do a box toward the rear of my car with the ports on the side?i dont mind doing a port in my rear deck if its gonna get alot louder that way..

I have talked with rob and rusty from dc on everything to do with my upcoming design for summer 2012. I am going to go with 2 xl 12s on two SAZ-3500Ds, backed up with juicebox batteries and a 220amp excessive amperage alt. The box will be a little smaller than recommended seeing as DCs love smaller boxes when they are overpowered. Now my question for everybody that I cant seem to get a hold of is port area, would I be better off giving it a little more (Kerf port btw) space (say 18-20sqin per cuft) or the "normal" range of 15-18sqiin per cuft? My goal is to get decent numbers in the low 30s. I do not have the depth either for aeroports. A 5" aero though would be 21 sqin p…

I am building a box for 2 XCON 18s and am trying to get as close to recommended specs as possible. box is going in a 99 Durango. i really want my subs facing forward so people can see what they are feeling! But not sure about where to place the port. SSA recommends 100 inches port area for each sub, so only real options on location is on the front, bottom; or facing the back hatch. i noticed a lot of street rides have the port facing the hatch for whatever reason. any input/suggestions will be greatly appreciated

how exactly do u go about finding peak note to use in port wars? i know what to modify AFTER the port is made but how do u know which note to use? i was thinkin about throwin the meter in the box and sealing it up.. but... if i do this, will the car's peak note effect the peak note for port wars? or IS the proper tuning for port wars equal to SPL tuning?

first off here is my box: here are the plans i used to build it: 2.26cuft@34hz i have a 12" fi Q BP power off 1200 clean watts and it sounds great in the car but when i pop the trunk while the sub is playing there is this whistling and its really annoying... seems to happen worse on low notes... what is the cause, not enough port area? cuz i am pretty sure there is plenty of port for this sub ive already decided i'm building a new box eventually but this is an annoyance that i would like to avoid with my next build tia!!