SPL & SQ / Fabrication

I'm looking into building an enclosure that measures 34W (left to right) x 18.5D (back to front) x 14.5 in height. The speaker is going to sit on top, port firing back. This is an L port design. The port will be 3 inches wide. My question is, if I want to tune at 33Hz how long would the other part of the port have to be (the one that runs across the back of the box)? I used RE's calculator for my last box a few years ago and it couldn't catch the lows for nothing, so I know something is not accurate about that calculator. If someone could help me with this, I'd appreciate it.

I remember reading somewhere about the relationship between a box's port area and potential output. The reason i ask is i have been looking at the IXL drivers from Mach 5 and in order to tune low in such small boxes the port needs to be quite large in order to avoid port noise. I was looking at a 2cf box with a fairly large port (roughly 50 inches) my question is will such a large port casue a loss in output? i was looking at tuning at 30Hz for a daily setup that would hammer out the lows. Is there a general rule of thumb regarding port size compaired with box volume? Could someone point me in the right direction (i haved tried to search) I was hoping some of the experie…

ok so i want to make a box with 1 15 in the middle and 2 poorts, 1 on each side, to get it how i wanted it ported, could i just measure out the space i would need for 1 port and just put half of that on each side?

my box is going to be 7 cubes after displacemets. box is 20 inces deep (so one port side can be 18.5") 112 inches of port area, 33hz my question is, can i do two ports, each 18.5"x3" at 12" long for ~33hz would that yield a net port area of 112 and keep the 33 hz tuning? if not, how do i go about calculating this? im going to try to do a drawing real quick to help you see what im doing

I cant decide if i want my port to be in the middle of my 2 18's or @ the bottom below my 18's people reply back asap thanks=]

What would be considered too small for a round port (in terms of diameter)? I'm trying to design a ported box (0.7 ft^3 ~ 24hz) w/ round ports for an RL-I 8" and the only diameter port I can use w/ a reasonable length is less than 1.5"...won't this create noise? I just can't imagine using a 1" port for that monster... What's the rule of thumb y'all?

I just recently bought a FI Q 12D1. I'm looking to have someone build me a box, but he recommended i get him some port specs. I wanna go 2.3Cu FT and tuned to 33 hz. Anyone know how to get the length/depth of the port? I'm completely new to ported boxes, any help is greatly appreciated.

Are there any pros and cons of having ports firing: the same directions as the subs, 90 deg off the subs, 180 deg off the subs?

Hey guys, my friend has a Ford Ranger and he asked me if having the port facing the door or roof would be louder. And I decided to ask on here for him. Reason because he is getting a box designed, what would the pros/cons of having it facing either way be? Thanks in advance.

i have a box all designed on sketch up, 4.2cuft tuned about 30hz. the sub will be on the rear passenger side of the cab, it will take the middle seat and the passenger seat in the rear. the sub will aim inbetween the front two seats and the port will either face towards the roof of the cab all the way to the passenger side or towards the drivers side. what would you guys do? originally i was going to face the port towards the drivers side, but if i have a passenger in the back i think it might blow their ear drum a bit... but i am sceptical about aiming it towards the roof because i dont think ill have as much air moving throughout the cab as evenly? idk.. what would you …

Do you guys take this into account (from the JL box building page): I take this as meaning I subtract half of the port width from the length. For example, my calculations calls for a 16.5 x 6.15 x 26.25" long port in order to tune to 33Hz. Does the physical port in the box then become 26.25 - 3.07= 23.18 inches long?

the vb part is the part that needs clearing up.... Vb= net internal volume of the box, correct? if that is the case, how is it written into the formula as square inches? bigger_george is building an enclosure for his rl-p 15's and needs to be able to calculate port length...however, he needs to plug in the Vb and he's trying to use square inches... here's the thread <-----click this link... so, which is right? i say Vb is supposed to be in cubic not square inches correct? wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

I am working on my plans for my box and would it be acceptable to cut a hole for a round port and have the port extrude from the box some distance? The Box is 3.5 cubes or so tuning to i hope 32 Hz for a 15. Could it be outside to get more airspace?

I have a Fibl 15" firing upwards with a port on the side of my box. I was wondering what would make it louder in the cabin of my car? Port facing me or the rear? Don't know if this will help any but I have a 2010 malibu

OK I'm finally going to begin my build next week sometime. The box will be a center console going from the dash to the back seat with 4 12" RL-p's facing up. My question is should I have the port firing forward towards the dash? Or firing back under the rear seat? This setup is going in an '05 Chevy crew cab. Thx for any help.

Going to be making my own port flares.. My dad works at a machine shop and has access to a lathe with will make things easier. He's gonna make me a mold so I can just fibreglass over it to make my flares. Now, I was hoping I could get some help with dimensions of the flare, it's going to be a 10" port, and I need to know what diameter to flare out to, and how deep to make the flare. Iv heard add 4" to the diameter but that could be total BS, but iv got no clue as far as how deep the flare should be.

I am trying to decide whether I want to go sealed or ported. My question is with tuning frequencies. Lets say that a subwoofers optimal tuning frequency is at 33hrtz and someone builty a box for 35hrtz, how would that effect the sound. And also what would the effect be if it was the opposite and designed a box at 27hrtz, how would that effect the sound. Sorry if this question has been asking a bunch before but I couldn't really find the answer I was looking for.

I was wondering if anyone has done builds on a 97-00 Honda crv and how much space I should leave between the box and hatch?

Ok so im going to build a box for my new setup and im still not getting this port thing. Alright so the dimensions i want the box to be is. Height 20, Width 49, Length 50. And tuned to 32 hz.

First time building ported enclosure, I would have someone build it but I'd cost too much to ship and sounds like a fun project, sorry Argent hmm, scratch that the box volume is going to be 7.66cuft I used the port calculator at 12volt, port width: 30" port height: 2" port length: 13" tuning: 33hz I drew up this pic so that someone could tell me if "B" is part of the port length or what (p.s. picture is not in proportion to dimensions, just general.) So would A+B=13" or is A 13" and B is?

I have 2 SSA Evil 15s My box Outside Dimensions is 41W x 31H x 21D / Double Baffled all the way arournd 1.5" Birch My box Inside Dimensions is 38W x 28H x 18D I have 2 Braces 1.5" x 3.5" x 38" and 1.5" x 3.5" x 18" I need help with designing a port. I would like to be tuned to 28hz / As you can see my Port is too Small. I dont want to remake the box i would like to Remove the Port and Fix this Box. Box inside Cubic Feet Empty 11.08 Brace Cubic Feet .17 Both Subs Displacement / 2 x .22each = .44

I have approximately 2.6ft^3 before displacements. This box is for 2 DC Level 3 10s. I'd like for the box to be tuned around 33hz, I planned on using a pvc/abs round port. What diameter should I use and how long should it be?

I am designing a custom box I want tuned at 32 hz and I am not sure if I am using these online calculators correctly. I enter my box volume and height and width of the port and it gives me the length i need to make it... my question is what is my box volume? It is with or without the port??? My box is all completly designed and ready except for the port length because I am not sure how to get my desired frequency. Here is my current box. Height= 15 inches Width= 17 inches Depth= 20 inches (I might lower depending on how much I need for port) Port height = 13.5 inches Port width = 2 inches if this enclosure was SEALED, its total volume = 2.24 cubic feet, i was aiming more …

Ok i need some more help trying to figger out how big to make my port, it is for two sa-15's on the saz-1500d .v2 in a 97 Blazer. The box will be 19H, 38W, and 26D, subs up and port back. But i wanna put the port on the bottom centered and i was going to make the port. 6H, 20W, and 19L, but that didnt give me enuff port area and i want it somewhere between 32 to 38 or so Hz. So if someone could please help me out it would be much appreciative thanks.

i hope this is the right section butt.... Im still a nexb to box building and I want to make a ported box. It will house two sound splinter Rl-p 12s. I still need to find an amp so i dunno the exact wattage ill be giving them, but i want to give them like 600-800 a piece so thatd be 1200-1600 total. I want kind of an LSQ tuning so would 34hz be alright? (thats what the site suggests) If not then just tell me what you guys would think the best LSQ tuning would be. Then how do I figure out the dims of the slot port once i kno what hz i want??