SPL & SQ / Fabrication

I just had a box built for my 2 icon 12's tuned at 30hz.I had it metered at my local shop.they said it was peaking at 40hz.is this normal?is it cabin gain etc.

this is going to be my layout for a new box ports gonna be up top they will be coming through the decklid and the subs are gonna be firing towards the trunklid.what do yall think of this setup?

This is a WINisd plot of my final 3. It is comparing 3 ETHOS 12's against an EVIL 18 and a pair of ETHOS 15's. The ETHOS enclosures were taken directly from some of Quentin's suggestions, and the EVIL 18 was a shot in the dark based on my space limitations. How accurate is WINisd in calculating real world SPL? Based on the modeling an EVIL 18 equals three ETHOS 12's at peak tuning (hard to believe); the ETHOS 15's win all...The EVIL 18 is pitted against the three ETHOS 12's for SB2 class reasons, the pair of ETHOS 15's is for I don't give a damn what class I compete in reasons.

I would like to make a vented box similar to this with the top ledge on it. The pic attached is of my current box. The front of the box is to the right. I'd like to make a ported box in the same shape with two ports each pointing out of the top directly through my open 6x8 speaker holes in the deck.

just wondering what you guys felt about attaching things like felt or sound foam, (seen a few designs on DIY like this) for SQ purposes, not SPL ofcourse, but for less vibraton and harmonics, etc...

I built my box today it is around 1.75cuft and I went ahead and sealed it. I took a old circle port out of a old box I bought and it is adjustable! I was like holy crap.. anyways I believe it is a 4" port and it adjusts from I believe 4 inches in length to around 10-12 inches. What would the length of the tubing need to be for lets say.. 30-32hz?

Just got done doing a system for my friend on a hifonics 1000 watt amp and a 15" l7 and the box he got is terrible it can't hit anything below 40 worth a damn. And he loves his lows. So I was wondering of anyone in NJ OR PA would like to get paid to build a box more suitable for the sub. Thank you

Just finished an install on my 95 probe. Put a DD 3515 in 3.5 cubic foot (after displacement) box with 2 - 4" aeroports at 17.75". Hooked to a RF 1000a2. Box is a standard CRX design. I've been toying with box placement and right now its sub up port to the side. Sounds decent, but a friend had this exact setup in his 98 Explorer and it was quite a bit better in there. So I'm assuming the problem is related to box design, tuning or placement. Any suggestions??

I have an 04 Avalanche that I want to build a box as a center console since it's the only place for a reasonably sized box. I have overall dimensions of 13"wide by 24" long and 16" high with 3/4MDF. I haven't worked with ported boxes so I'm a little unfamiliar designing them. My plan is to have the sub rear facing and at the top of the box, with a slot port on the bottom facing back. I will be driving the Fi BTL 12 with a Kicker KX800.2 which is tested at 1038w. I enjoy mostly rap\hiphop style music, but want good all around sound. So my questions are: How do the box and port dimensions look? Is there a different port style that would work better? Does the port placement…

Hey, im about to build a box for my buddy and i wanna get around 4 cuft. per sub after all displacements. Again they're two cvr 15's. I was thinkin somewhere around 14 inches of port area per sub per cubic foot of volume and im planning on tuning the box around 35-38 hz. so (14 x 4) + (14 x 4) = 112 inches of port area I've build a ported box for an Fi Q15 and i had it tuned to 33hz but it sounded like it was tuned very low once it was inside of the truck. And i have read that when the box is intstalled in a vehicle the tuning frequency of the box drops about 5-7hz because of the resonant frequency of the vehcile? So im trying to account for this with this box i'm b…

I know that ports are most efficent when they are facing on the same plane as the driver, and that you loose any gains form the port if it fires 180 degrees from the driver. but, how much SPL will be lost by aiming the por just under 90 degrees from the driver? In a (hopefully) up comming enclosure construction for an XXX18 in a Mazda B3000 ext cab putting the port on the same plane as the driver will be very hard, so i am thinking of having hte port firing up and the woofer on a slanf facing forward.... how will this compare tothe woofer and the port being on the same plane? im not concerned with not being loud, i am concerned with not beating a friends 4 JL w1v2's with…

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hi, i am new to the whole db drag thing? if thats even what it is called. how does these competitions work? i would imagine who ever had the most money would win... i mean its not like you can run and make your system louder or anything so since it is all just bought how is there a rightful winner if people just drop thousands and thousands of dollars? sorry it might sound stupid but i really dont understand.. vocab might help me too! thanks

Hello , I am building a box with a round port. I'll try to flare the openings to have a nice flare port It will be a 6" port or an 8", I don't know yet ! How far from the box side can I have the port ? How much "room" does it need to play correctly, safely ? I know I can use an elbow, and I will if it's necessary. Thanks in advance for your advices.

OK tell me if this looks correct. TD=time delay A=distance in feet from ear 1132ft/sec=speed of sound 1000=ms TD=(A/1132)*1000 Left=2.2ft 1.94ms=(2.2/1132)1000 Right=4.6ft 4.06ms=(4.6/1132)1000 4.06-1.94=2.12 TD Does this look correct? I found this formula on ECA, I am having problems finding other formulas on the topic.

I recently took my two 12's and put them in a prefab box built to hold two subs. Its a camaro box so it's wierd. I put them in that box because I had two single boxes for the subs and one was leaking real bad. Anyway, MY question is, how come they hit harder in the two single boxes than they do in the dual box? I think it might be because the box is too big. So is there anyway I can fix that? I seen a box another person had and he had it stuffed somewhat with newspaper? Would that help the subs hit harder in the dual box? Thanks ~MadroX

I have pretty much been out of the game since 2009 because I was happy with my last build and left it alone for about 5 years. I recently bought a 94 F-150 ext cab to DD and I need my tunes back. This truck is going to give me some headaches but I'm slowly getting there. I'm looking to put a 10" SSD in a center console box, sub down with a forward firing aero port to try and get everything to fit and not look too silly. I made some templates today and figure I have 18" height, 24" length and 12" width overall to work with. That includes lifting the box 2-3in off the floor for sub clearance. I've never used an aero before but have been doing some research and I think I des…

Im using 4 4" aero ports. The box I will be mounting them to is 38"x20"x20" with an 18" sub on one side facing up. The 4 wont fit in a line since their flare is 7"+, so my question is, should I do sub in the middle with the ports on the side of the box facing back 4 in a row, or can I make a square with sub up port up, Will having 2 ports closer to the sub than the other affect anything? or will air movement be equal between the 4?

Here are the updated rules for MECA http://www.mecacaraudio.com/2009rulebook.pdf

Hello all, i have a question about a box design, i have always had beat in all my cars but i have never built a box before so this is going to be my first one, and i was wondering if this design would work or not, its going to go in a 96 blazer. thanks alot

looking to free up some space in my nissan 350z so i'll be replace the box i built for my single sundown audio sa-10 with a stealth box. now before i do this i was wanting to know if this box will work great with my sub tune at 33-35hz instead of 39hz. The box i have now is a 1.095 cubic feet vented box tune at 35hz with the sub facing up and vent facing forward. h**p://www.ebay.com/itm/350Z-Ported-Vented-Sub-Box-Subwoofer-Enclosure-Plexiglass-Amp-Rack-39hz-/261676372251?hash=item3ced20911b&vxp=mtr

hey gang we are having our second annual spl clinic....this clinic is free and open to everyone.....we strive to help get new people started in spl and for us old dogs to learn something new...there is a flyer for the events coming up on our web sight at the link below http://www.trueaudioconcepts.com/specials.pdf if you would like to help out with this event we would love to have the help.....just contact me through the web sight...thanks

I am quickly becoming overwhelmed trying to plan a box for my BTL. I want to rebuild, as my current box is water damaged and pretty ugly at that; not to mention, it's tiny; 5cu @ 34 before displacement, and the port is small as well, 4" x 15.5" (it was free with my woofer) My max dimensions are 34"x26"x23", and i'm aiming for a pretty low tuning, thinking 28-30hz, I like a lot of slowed music, Decaf, etc. I have a local builder, but I haven't seen any of his work in some time, so I'd feel better walking in with a design in hand, and simply having him make the cuts and assemble it. It'll end up in an SUV, so I'm thinking sub up port back, same as my current box. Would…

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For all you guys here in california, or wherever your are, come check out our comp. As of right now its a 2x weekend. With our comp on Saturday and another on Sunday in Woodland. Here is the info. Even if you do not want to compete come out anyways. Come chill... or compete its going to be alot of fun. Giveaways too!