SPL & SQ / Fabrication

Ok. So I keep hearing different things from different people. Maybe some people over here have some decent advice since im not getting it else where. So I have a DD3512. DD recommends 2.5cu ft ported at 40 hz for their enclosure. Some of the local guys here who run DD say NO. that I need about 4cu ft ported about 36-38hz for one DD 12. Then another guy I was talking to online who tests TS parameters and sub on a daily basis says that the 3512 can play great in a box down to a cu ft. but is good in about 2-2.5cu ft ported at about 34hz. WTF?! All these dimensions contradict eachother and I know DD isnt a super woofer that can play in anything so someone help me out …

I bought a box i just saw some of the glue is coming undone so im gonna glue it again and screw it down and seal up the inside. But i need to know what it is tuned to here are the measurments thanks in advanced. I have an L715 in a ported box the measurments are 16" h 40" w 17.5" d and the port is 3.5" w and 13.375" deep. I would like to know how many hz it is tuned too and how many cubic feet it is after port and sub displacement. Thank you

So i was metered today and this is what i got... 144.6 Outlaw under the floor @ 39hz and an oddity i scored 145 @ 39hz legal on the windshield The shop i was at thought it was quite odd that i was hitting higher in legal than i was outlaw. 15 fi bl on a saz-3000d @ 2 ohm

I have decided to go with Selenium ST350 Super Tweeter, and Selenium 6W4P 6" woofer. I will be running thes active and have a copule of questions about them. First question: one being will it sound ok to mount the woofer in the stock door, and the tweeter in the stock dash. I will have to modify the dash a little bit, since the hole right now is 4", and mounting of the tweeter is 4.25". Will it sound good with it located up there? Next question: Since this is my first active setup, I dont want it to sound like shit. So, how do you guys block the mid sound from going to your tweeters? and stop the real lows and real higs from going to the mids? I will be running a MB Qua…

What do you guys think of the design? Its for a DC lvl 4 12'' sub How would I factor in a kerfed port to the design??? If the kerf is secured as an external portion of the port, will it affect tuning or require a change in design anywhere? Specs come to: -2 cubic feet before subs displacement -32.5hz tuning -36.25 sq inches of port area

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.

i was reading the new england spl site and i see it other places what dose CRX mean and why cant you have it

I have a question about ports. I am having finely decided to use round ports. But I have a problem; I have 8.89ft3 I want to tune around 38 Hz. The problem I run into is I need like 15’’ of port. The box is only 14’’ deep, going with 2 8’’ ports. So, can I bend the port with a 45? So it will make it in to the car with out a problem. If yes, do I have to add any thing to the length, or do I just cut the tube where it needs to be and add the 45 in between the cut peaces. Trunk setup subs up, port up going thought the rear deck.

Looking for ideas based on experience! My shop has a 1998 Chevy extended cab being used for SPL competing in USACI Modified. We will be using four AddictiveAudio V4 15" woofers with roughly 12,000 watts rms. My question is how should the enclosure be built for max spl? Just looking for ideas here.. we are stuck at 157.6 db on the term-lab at drivers kickpanel.

just bought a 18'' fi bl dual 1 ohm im runnin 2 ohm 2 a 1200.1 jbl.. im installing it in a 96 yukon..4dr. how should i build the box , which way should the sub face ..and port...how many cb ft...thanks..

here is a pic of my trunk: I have a 12'' DC lvl 4 sub. I drive a sedan. I like to listen to a lot of pop rock // pop punk // metal music, some have fast bass drums//guitars I think I'm going to go with some type of ported box, which should I go with? a slotted, vented, ported, or what? Can anyone help me design a box for my subs? I also don't know which way to port it, towards the trunk? I'd like to have the box toward the side of the trunk, so I can still fold down the back seat and access the trunk.

im about to trade for 2 SSD 18's just to mess with for a bit. so im planning on running about 11.5 cu ft at 35 hz, but gonna make interchangable ports to play with different frequencies. so should i port it forward, or up. subs are gonna be facing forward in a 01 dodge ram ex cab BTW

I was wondering if the calculator here ; http://www.psp-inc.com/tools.html calculated it's tuning including displacement of the tube or without displacement. Thanks.

I'm just trying to design a new box for a 93 civic hatch. Just wondering if anybody has any suggestions for me. There will be 3/4'' all-thread rod for bracing. The box is for 4 12'' pioneer premier ts-w3002spl. It will be in a wall config. subs on driver side port on passenger. all thoughts are welcome. This is what i got so far.. http://memimage.cardomain.com/ride_images/3/3224/1061/33058030018_large.jpg

I am trying to plan how I am going to build a box to go in the ex cab of my toyota truck. I am putting 2 Fi Q15's in it. The space I have to work with is 53'' wide 17'' depth and 22'' tall. I was told to use 1 layer of 3/4'' MDF then after the box is done add a 2nd layer of 3/4'' MDF to the outside of the box to help reinforce it, is this right? This is the first box I have build so I just wanna make sure I get it right. But this is what I have come up with so far, how does is this right, the subs call for about 4 cub feet each tuned to around 33.

Cuz im going to compete i could use some test tones, if anyone has them, please email me or send me them on MSN toom585[at]hotmail.com

I got JBL GTO 1514 single voice coil 4 ohms. 350WRMS, 15 inch. It came with manual and says Vbox 3.50 ft3 Fb 30.0Hz, so is this box tuned to 30hz ? Im thinking of making new box and i really need ideas how to improve my SPL. I want to try different box, something like this: At the moment i just have vented box with round pipe. but i want to make something like in the picture, so how can i calculate box size ?

I want to check some numbers but Im not sure if there are any trustworthy sites.. Got any?

I have a 99 Siverado 3 door. What I want to do is take back seat out and build a box for subs so they will be behind driver seat stacked on top of each other. Take back seat and get cut so I will still have a half seat back there. No one in my area wants to deal with it. Is this a good idea? I just want my trunk to be able to carry 3 people instead of just 2. Would a ported box still be okay on one side of truck?

i have a 12" FI Q w/ BP option in a 2001 jeep grand cherokee. powered by a SAE 1000D @ 1ohm. right now it's in a 1.5cuft (external before displacements) enclosure that i had the (horribly stupid) local audio shop make for me. i was short on time. i'll let you know dimensions of the room i have to work with. but there is basically as much room as you could ever need for a single 12. or i want it ported tuned to anywhere close to 32hz. so yea, have fun, keep in mind this is my first box. and i don't want it to be over (i believe) 16 inches. i just want it to stay below my rear window level. thank you so much i know it's not really hard. it's just a temp box to get some prac…

Crown Victorias have some pretty big trunks, i drive one. Heres a pictures Is there a way that i can place ONE piece of MDF and mount it somehow onto my trunk so i don't have to make a whole box. Its my car so i can use up that space however i want, place it anywhere in the trunk.( dont' have to worry about groceries etc.) I want to use 1 board, and the trunk itself to act as the rest of the box. Is that possible or will it be bad for my sub? Any help in this area will help, just bought a SSD 15. Or if you know any other simple ways to not have to go threw the trouble of making a box.

anybody on the north shore mass or southren new hampshire area with a meter who wouldent mind spending some time playing with my system. got a few bucks if nessasry

Ok guys ive been looking at some system setups and i found what im wanting to go with. Im looking at ordering 2 BL 10" subwoofers, well want im wanting to do is my truck currently has a bench sit and i was going to get to bucket seats and build a box/center console bewteen the seat and what i was wanting to know if the 10" will work in that spot and still have enough air space to beat down im trying not tunnel my truck because it is going to be bagged and not sure where im putting every where yet. I have a 90 Toyota Pickup Single Cab so if u can let me know that would be great. Here is a pic of a sample of want im waning to go with. The speakers in this truck are 8" spea…

Just got my new BTL 18 with all the goodies i wanted. now for the box. I plan on building it, but it will be the first one i build. Naturally i have a few questions that i would appreciate anyone taking the time to answer. I got alot of box building info from http://spkrbox1.spaces.live.com/ it seems to be legitimate information, i'm pretty sure i got the link from this site. but should the height of a box really be 1.4X the weight??? with my calculations, to get a box of 8.6 cubes BEFORE port and sub displacement, my box has the be 34 inches tall!!! (25X34X17.5) Ports brings me to my next question... are there are any performance differences in the type of port yo…

i currently have a fi btl 12". tunned at 34 hertz, hitting 139.7db. i was told that tunning higher is better for hitting high spl. there is a competition comeing up on the 10th. and the kids at the local car audio dealer ship told me that there were people with 1 12" hitting 142's. does anybody no how high i should tune my box so i can compette.