SPL & SQ / Fabrication

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:

Well, I built the box as recommended by Bromo but somewhere when I was taking measurements I messed up. It is currently 35Wx15Hx19D. If I take 1.5-2 in. off the width and extend the depth? Would I still get the sound as before?

I am getting AA Assassin Series 12"D4 and I want to make a box for them in my tech class. My goal is to make a transmission type box. I am just not sure what you need to do it right. Like how to tune how big you need to make the vent. I want to make the box about 4-5 ft. If anyone can help me that would be great.

Hey guys Im currently out in pursuit of the rookie1 world record in Iasca IDBL format.. I'm using 3 8'' mtx 5500 running them off a sundowns 1500d with a optima d34 up front.. Im limited to port area, 14 per sub so I'm basically playing with 42sq inches.. My current port is 39sq inches and Im doing a 140.1db on the audiocontrol meter.. In my class Im not allowed to use test tones so Im using tracks like 36 mafia-slob on my knob.. Is there any ideas yall could give me to bring my score up? I'm thinking of re-building my box to give each sub 1cub of space each with a solid 42 sq inches of port. Maybe try 45 degree fillers and fiberglass the inside of the box with external…

Vehicle : 95 cadillac sedan deville Location in the vehicle: trunk under rear deck between shock towers , down firing with port back behind driver's side rear seat Space available (Length x Width x Height): 20" x 40" x 13.5" Subwoofer make and model: American Bass XD 1022 powered Q1 2200D @1ohm Subwoofer Size: 10" Number of Subwoofers: 4 in a staggered format Type of Port (Kerfed, Slot, Aero, etc.): slot What type of music do you like?: rap r&b rock Is your goal SPL or Everyday Music?: everyday Tuning Freq (Hz): 32Hz Volume : 4.09 after woofers port and bracing Questions: has any one here ever tried this type of set up and if so how did it turn out?

So ive currently have got an Fi SSD15 in a 3 cube box, ported tuned around 31 hz. it murders the lows, and theres no port noise that i can tell despite it having only about 11 sq inches per cubic foot of box volume. the problem is, there seems to be cancellation in the 50-65hz range. it hits great below that and even gets louder over 65hz until it starts rolling off around 85hz. this is in the trunk of a 2001 BMW 525i. i have the sub fired up with the port back. im very frustrated with this lack of a crucial sub bass octave. i'm about to build a new box, in the neighborhood of 4 cubes with a port tuned around 35 hz, with at least 14 sq inches per cubic foot of interna…

I wont to bild one of thes http://www.decware.com/whornok.htm for a set of 8's will the RL-i8 work in this tipe of box and what will the sield chamber be it ses to model a regular 4th order single reflex box to determine the rear (sealed) chamber but i dont have the program to do this i know the rli-8 is not out yet but i can wate for it

I am looking for anyone in NorCal who might have a mic and whatever software needed for EQing my car that would like to help me out. or if you know of any local shops that are good about doing this sort of stuff cheap/free, that would be cool.

Im looking to get a good SQ setup. Ive narrowed my options to the SSA Icon 12 or a Fi Q 12. Whichever one I get will be powered by a Cadence TXA-1000D amp. I cant decide on which one, hopefully somebody here will be able to help me decide. I listen to hard rock/metal almost exclusively and I drive a 97 2 dr Exploder. So, which has the best SQ with the most output? Thanks, Mo Also, if I get the BP option on the Fi Q and still just run that same amp would it make a difference?

its actally about 5.7 after bracing and displacement, is it too big?

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'm considering building a down fire for 2 D-CON 10's. Will be subs down,port back, box against back seat. Going in a Land Rover. I only cosider this because I do use the cargo area often and want keep the subs out of harms way. My question is how much room do I need between the floor and the woofers???? And should I just elevate the box by the end plates or do a 3sided lift leaving only the rear open???? Or is it a bad idea all together???? Is a daily thumper setup.......just want to keep my investment safe.

I only get static when both sets of rca's are plugged into my 4 channel avionix amp. When i have ony 1 set of rca in the amp it is clear (Static-free). I tested this on both sides of the amp and the same thing happens regardless if i have the rear rca installed or front rca installed or vice versa. ANy ideas?

To have a loud LOW end and the SMOOTHEST transient response (not punchy) and DEEP overall which type of box should I get.

What's the best way to figure out the displacement for each one of these? They will be about 15.75" long & 1.5" in diameter. I used them on the last build I did for the blazer, and they held strong, and were easy to use. So I'm thinking of using them again with my next one. Thx for the help.

I been going back and fourth for the past few weeks about doing a enclosure to go under the rear seat in my truck. I entered my measurements in the enclosure calculator on the12volt. and i came up with 4.7 cubic ft but it have the transmission hump thats right in the center of the floor and i dont know how to subtract that from the total that i got from the enclosure calculator....do you guys think and enclosure like this would work with a external port? Im still looking around for some good 10's that would work with 1 cubic ft or less

I know that the guys in Potsdam at Northern Music & Video did 4 winter shows this year, but I was just wondering if anyone was going to do that again this year, or are they going to try to kind of synchonize them with the other shops in the area that are going to be putting on shows?? I mean I know the guys at NM&V will put on their shows, I am sure that Ultimate Edge will do their shows again next season, I know that peteyglad and myself will be doing shows in conjunction with Happy Ear nest year. Just wondering if anyone was doing the winter shows again.

Since I have a Ford Taurus my trunck was totally sealed and no bass would come through and had to port my seat and my deck lid and am trying to locate some speaker cloth that will let the bass to travel through without affecting airflow. Do they make this. I did try the metal mesh grill like I saw in an Overhualing tv show but found it affected bass intensity and sound quality. I am a musician and know my bassists amp has a plastic type mesh (grill) that suppesedly doesn't affect sound quality. Just wondering if anyone out there uses anything specific?

if any of you guys can give me an idea of what type of box works best for an early 90's cavalier station wagon id appreciate it, im a trunk guy and dont really know what works best in that type of vehicle, aside from a wall what do you guys suggest? the box will house 2 DD9512's dual 1.5 ohm subs and be powered by a single earthquake d10.

not for sure where or when this happened, james herren sent it to my phone, hence the crappy quality. anyway, figured it would be good for some laughs. and yep, it's a 172.2db run. wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

I need help on porting a box for a 12" sub. I would like the box to be around 2 cubic feet. My only restriction is that it can only be 13.5 inches in height. Any help would be great.

I got a cut sheet from skar audio, and i want to know others opinions on it. Ive tried to draw it up on paper to visualize, and ive done some calculations to help someone who knows how to use the info. Its for a friend so i don't wanna waste his cash on a shit design. Ok so he has a 97 Jeep grand cherokee. 90a alternator, I did the big 3 for him in some 4 gauge stinger pro i had laying around, and he had already bought a Rockford amp kit 4 gauge also...pretty nice wire. Ok the max dims are 36" wide, 36"deep and 30"tall, this leaves plenty space for the port to breath either up our back..The subwoofer is a skar audio ivx15 V1. Its a d2 coil. Here's spec off woofersetc.co…

I understand the physics of it, but Casey showed me the Pioneer Death Match winning truck that did deep into the 170's, can someone explain more? I want to understand about them, also when is it benificial to use one and when is it not? here is the pic of the wall

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 ?

Cabin volume vs box volume. when building a wall do think the box should have more volume than the cabin? Spl should be louder in the smaller of the 2 right.