3.5 cubes @ 32Hz Box Design
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Silver Member Username: DurskiPost Number: 347 Registered: Nov-06 | for 15" Fi.Q. Can someone help me make sense of that? Which is the side I mount the speaker to? I want the port and sub to face the same way but I guess it doesn't HAVE to be that way. Suggestions for a better design welcome, going in a 97 accord trunk. |
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Silver Member Username: DurskiPost Number: 355 Registered: Nov-06 | Bump Come on fellas I want to build this tomorrow or the next day |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19679 Registered: Oct-05 |    |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19680 Registered: Oct-05 | you can do it here. |
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Silver Member Username: DurskiPost Number: 357 Registered: Nov-06 | you're the man chad, that looks much better than the one I was using, Now I just have to see if I can fit 34" wide into my trunk, thanks a lot man |
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Gold Member Username: Andrew571Stillwater/Edmond, Oklahoma USA Post Number: 1663 Registered: Oct-05 | It'll probbaly turn out to something like this.... O wait a minute - this IS a 3.5 cu ft box tuned @ 32 for a 15 Fi Q.   |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19681 Registered: Oct-05 | in the trunk isn't the problem chris. you gotta make sure it fits through the opening of the trunk. you have to be really careful on the dimensions cause slightly too big and it won't fit through the opening. nice andrizzle. |
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Silver Member Username: DurskiPost Number: 358 Registered: Nov-06 | I can't find anything on that site about CuFt and port tuning on that box... I assume you did me a favor and put in the above mentioned dimentions yielding 3.5 cu ft @ 32 Hz... |
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Silver Member Username: DurskiPost Number: 359 Registered: Nov-06 | nvm I see it now, 3.4 cu ft @ 30 Hz |
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Silver Member Username: DurskiPost Number: 360 Registered: Nov-06 | right about the trunk opening chad, I had to remove my trunk latch to get subs in an old car I used to have... I suppose I could park my car for the weekend and build the box in the trunk lol, not really |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19682 Registered: Oct-05 | looks at the part i put the yellow square on.  |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19683 Registered: Oct-05 | you don't want to do that. what if god forbid you get a flat tire and you need to get your spare out. i built a box that is 3.5cuft and was able to fit it in the trunk. i have a 05 accord coupe. because of the opening, i had to make the box only 16inches high. it don't leave much room after you put a 15 inch sub on it but that is the best i could do. so that is why on your box design, i made it 16 inches high also. |
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Silver Member Username: DurskiPost Number: 363 Registered: Nov-06 | Yeah I looked a little closer and saw those specs. And The rear seats fold down, gives me some leeway If I need to get to the spare tire and stuff, but I will take your advice and measure a few times first. I am a little concerned about mounting the sub with only 16 inches to play with.. with a wood thickness of .75" doesn't that only leave me with 14.5" to mount the sub? Will that work? Is it O.K. to have some of the mount screws go into the bottom and top panels? |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19684 Registered: Oct-05 | what you can do is double baffle it to make it strong. that is what i am gonna do on the next box. i can't fit a box that is 17 inches in height through the opening so i am pretty much stuck at 16 inches. |
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Silver Member Username: DurskiPost Number: 364 Registered: Nov-06 | for double baffle just put a decent amount of glue all over the facing sides and evenly spaced screws? BTW I'm trying to get my hands on some cardboard to test box sizes, hehehe, I'll take pics of that |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19685 Registered: Oct-05 | yeah thats a good way to double baffle it. and lol on the cardboard thing. i did the same thing. i have bunch of boxes at my work cause we ship alot of clothes. anyways i made the box size to see what would fit through the opening. lol. i guess great minds think alike. lol. |
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Silver Member Username: Phil_salisburyPost Number: 620 Registered: Sep-06 | That box looks exactly like the one I built for Malik for his SI Mag 15, which he picked up today. I gotta say that Mag 15 sounds sweet and the bass response just had that right amount of SQ to it and not being to boomy on the lows. |
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Platinum Member Username: BestmankindHttp://www.rdaudio.net... Post Number: 19715 Registered: Oct-05 | did you start on the box chris? and yes phil the mag is awesome.  |
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Silver Member Username: DurskiPost Number: 366 Registered: Nov-06 | I'm toying around with some width lengths, it look really funny in my trunk right now and there's a bunch of dead space behind the box I'm trying to get it to fit into... I'm shaving 1 inch off my prototype, then if I like that I'm going to buy wood today  |
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Silver Member Username: DurskiPost Number: 367 Registered: Nov-06 | Alright, This next pic is with a width of 33 inches, It a snug fit so I'm going to go with 32.5 wide, 17 deep, 16 tall. The extra 1/2 inch should make it easier to fit in especially after the rhino liner gets put on.  Box Volume: 3.472 Tuning: 30.01 <--- How can I get that up to 31 or 32? or will I even notice a difference? |
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Silver Member Username: DurskiPost Number: 368 Registered: Nov-06 | I was playing with the box calc and dropping the square port length 2 down from 8 inches to 3.5 inches gives a 31.99 Hz tuning. Should I bother with that or leave it at 30Hz? |
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Silver Member Username: DurskiPost Number: 369 Registered: Nov-06 | Double baffle. How would I do this on this box? Double up the front plane? or get a sheet to cover the entire front panel and cut out the port as well? meaning option 1 (will look odd): 2 panels of 29.5 x 14.5, or option 2: 1 panel of 29.5 x 14.5, and 1 panel covering the outside at 32.5 x 16? |
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Gold Member Username: Dakangofkrunk16Boca Raton, Florida Post Number: 1421 Registered: May-07 | Chris Did you cut those your self.. or had them pre cut... |
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Silver Member Username: DurskiPost Number: 372 Registered: Nov-06 | bought the mdf and had them cut it at lowes, they messed up on of my dimensions but at least they made it too long instead of too short, gonna have em fix it tomorrow when it's not raining. |
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Gold Member Username: Dakangofkrunk16Boca Raton, Florida Post Number: 1424 Registered: May-07 | how much did that cost>? |
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Silver Member Username: DurskiPost Number: 373 Registered: Nov-06 | 1 sheet of mdf - $25 1 tube of tite bond - $4 they cut it for free, I've had them cut ply wood and other stuff also, I think just as long as u buy it there they will do it for free I just gotta find something to cut my port and speaker holes with now... I Don't think my dremel will work on wood this thick |
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Gold Member Username: SomedonniedudeIllinois United States Post Number: 1349 Registered: May-07 | I didn't know lowes will cut the wood. Next time I'm gonna save the hassle and make them do it lol. |
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Silver Member Username: Drant19DUB-C, TX Post Number: 583 Registered: Aug-07 | just make sure they do it right, they cut some of mine and it all was an eigth of an inch off. good thing i have a table saw at the house! open item table saw at sears = 99bucks! |
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Gold Member Username: Dakangofkrunk16Boca Raton, Florida Post Number: 1427 Registered: May-07 | YEa me either... I'll do that to maybe... Just not having a Table saw or Circular sor Jigsaw Router or anything is kinda gonna make it hard to build my box.. Gonna have to borrow stuff |
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Gold Member Username: Kpa2727Old Bridge, NJ USA ! Post Number: 1035 Registered: May-07 | They will not always do it for free it's a horrible store but then gain they all are in my opinion. but back to topic it typically ranges free to 75 cents a cut , most of the time not more then 40 cents a cut. this is due to the blades replacement it's like a blade fund. all lowes that sell would should have these. thier typically always located on a endcap in luber. heres the bad though, it's a panel saw, for saftey issues. the problem with this is they don't have a line where the blade is since the try to self contain the blade for saftey. meaning theres a pencil line and that's the cutters guide. so you got lucky that it worked as well as it did for you. lastly a little tip, almost all lowes saws keycodes are the store number found on ur reciept and the pound sign or 123456 pound.  and if u dial ether pound 35 or pound 30 on a phone in the store u can page, also never yell code adam. the stores have to go into lockdown in case of a lost kid. |
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Silver Member Username: DurskiPost Number: 374 Registered: Nov-06 | Good info Keith, hehehe. This guy did an ok job, most of the cuts were either right on or only off by 1/16" inch, much better than I can do (especially since I don't have the tools to do it). Even the dimension that he screwed up was off by exactly 1 inch, understandable that he just read it wrong since he only had to make one pass for that particular side of the board. Raining again today, Water + mdf = toilet paper, looks like I'll be waiting another day to get this fixed... maybe I should just go get my own jigsaw and do it myself... I don't know any other way to cut a speaker hole in this stuff... |
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Gold Member Username: Kpa2727Old Bridge, NJ USA ! Post Number: 1045 Registered: May-07 | just get the dremel drill blade it's like a roto zip blade and the circle cutter for it. you can buy it as a kit at lowes for like 40 or less prob a average of 15 - 20 but prices go up and it's been a while since i looked and dremels tools fluctuate in odd price ranges. mdf really isn't as tough as u think. that dremel should buzz through it about 10 times beter then a jig saw if u get the right blade. |
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Gold Member Username: Kpa2727Old Bridge, NJ USA ! Post Number: 1046 Registered: May-07 | here ya go, |
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Gold Member Username: Kpa2727Old Bridge, NJ USA ! Post Number: 1047 Registered: May-07 | my bad ur doing it for a 15 inch hmm not sure then maybe just a blade attachment. |
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Silver Member Username: DurskiPost Number: 375 Registered: Nov-06 | thanks for tryin keith, I tried out my knock off dremel with a wood bit on some scrap mdf... I will be buying a cheap jigsaw somewhere, there's no way I can make a relatively straight cut with it let alone a perfect circle. Also started to make the mdf smoke when I tried to just drill a hole straight through it, I guess 3/4" is too much for it to handle. When I have more time I'll go get that tool and fix the dimensions myself, trying to get my senior project finished up so I can graduate in 1 month!! Rain every day doesn't help either. |
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Gold Member Username: Kpa2727Old Bridge, NJ USA ! Post Number: 1055 Registered: May-07 | yea i just got a real dremel, a knock off just dosen't offer what a real one can and u need a cutting blade not just adrill bit plus the right speed for the bit. ur burning the mdf by it spinning to slow and you moving to fast. |
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Silver Member Username: DurskiPost Number: 376 Registered: Nov-06 | I tried at a few different speeds, drilling down 1/2 way into the wood and scrolling around was easy, but the main thing is it's so damn hard to control I'd never get a straight line out of it |
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Gold Member Username: Kpa2727Old Bridge, NJ USA ! Post Number: 1059 Registered: May-07 | yea that's why u gotta get a guide jig. u might be best just to get a jig saw but just a feair warning it's easier to control but if it's your first time using it. you will be just as bad as that dremel, your best bet if u get a jigsaw is just to practice. i'd say get a radial arm saw and a jig guide to cut straight lines, my uncle did that for mine. but u still need a jig saw to cut your hole. but look at it like this if u buy those 2 tools u can build any amount of boxes u need no relying on lowes to cut it. |
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Silver Member Username: DurskiPost Number: 382 Registered: Nov-06 | new thread https://www.ecoustics.com/electronics/forum/car-audio/470528.html |
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