2 12" Speaker split box

Still learning
Still learning Posts: 107
edited February 2006 in Car Subwoofer Talk
I'm planning on making a box for two 12s, this never came to mind till this morning, but i have seen boxs for two subs that have a chunk of wood splitting the box into, what is two boxs put together. The box volume i have to make is 1.3 cubic feet for each sub, what my question was; should i make the box 2.6 cubic feet and call it good? or should i make it split in half to make two boxs @ 1.3 cubic feet each? Also i would think that the two boxs split in half would be usefull for stero sound, you know have on sub hooked up to one channel and the other hooked up to the other cahnnel(assuming you have a two way stero amp) that way the wind paths wouldent mix up and come out with some weird bass, is this correct?
KDC-MP5028- Kenwood deck

Phoenix Gold speaker wire

Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

Alpine 5x7" Type R speakers -SPR-574A-, in the back.

2 Alpine type R subwoofers in custom box

1000 watt Alpine -MRD-M1005- AMP

-Price invested- Over 1500$

Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
Post edited by Still learning on
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  • hellohello
    hellohello Posts: 428
    edited November 2005
    the proper way is to have 2 seperate 1.3 cu ft enclosures... but that seems kinda huge for a 12".. what sub are u using? The idea of having 2 seperate chambers is that the air sealed inside forms a vacuum, not like a hoover, but as in the meat u get at the supermarket... u know sealed airtight. With the proper amount of air volume inside the box, the suspension of the speaker will have to "fight" to go beyond its limits, like the sealed meat i mentioned, they seal it so the meat cant escape the packaging, despite what the label may say :p
    Picking ones nose signifies a strong sense of self discovery :)

    System in the works: ;)
    PP 6V6 with 12ax7 pre ~ 20 watts
    15" Jensen MOD 8ohm ~ 97db SPL
    DiMarzio HS3 and/or Tone Zone S
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  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    there are two advantages to putting that center divider in: 1) a stronger box and 2) if one sub dies, you still get some bass (and you don't destroy sub #2)... the disadvantage is a slightly larger box that is slightly heavier... the sound won't change a bit from one to the next, so no worries there... and don't bother running them in stereo, it won't do anything (for the VAST majority of setups, and even in that little minority, the usefulness is questionable)...
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    Ok so, how is the box bigger when i have the two 12s in it than if i was to have two seperate boxs? im making the box with angled front faces, but i am using the formula:--- Area of the base, multiplyed by the height, to get the cubic volume in inches, then i have to do the whole 144/12 thing. to get the cubic feet, so if i make the box for the two 12s the exact amount of vol i need (1.3 cubic feet) then it shouldent be any bigger right? it will be just like putting the two boxs together yea? I thinkl im going to go with the diviver thing, limite space isnt really an issue, the box is going into the back of a 1993 eagle talon, so it should be fine.

    With the air thing, ?????

    P.S>- what happens when you make the volume to big? or to small? Lets say that i was to make the box for the 2 12s and i made it 3.0 cubic ft, what would happen then?

    thanks
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
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  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    the box is wider by 3/4 inch, if you're using 3/4" MDF (reccommended) for the divider... and yes, with the divider, it's like two boxes that share a wall... air thing??... and if you make the box too big, you gain low bass extension in exchange for transient response (it sounds deeper but sloppier/boomier)... if the box is too small, you get a higher max SPL, but less low bass (and if it's WAY too small it just sounds constrained and bad)...
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    i made a rough drawing of the box here
    <img src=http://tinypic.com/fa7znb.jpg></img src>
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    i made a rough drawing of the box here
    <img src="http://tinypic.com/fa7znb.jpg"&gt;
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    i made a rough drawing of the box here
    <img src="http://tinypic.com/fa7znb.jpg"></imgsrc&gt;
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • Still learning
    Still learning Posts: 107
    edited November 2005
    i made a rough drawing of the box here
    <imgsrc="http://tinypic.com/fa7znb.jpg"></img&gt;
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • Still learning
    Still learning Posts: 107
    edited November 2005
    why in the hell did that happen??? my bad....
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    Ok well heres just the link...

    http://tinypic.com/fa7znb.jpg

    I havent decided if i want to make it to stand like that, or sub on top of eachother.(vertical)
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
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  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    fyi, it's "slash img" without the "src" at the end...

    and could you fit them vertically? cause i rather like the box you have drawn...
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    edited November 2005
    Your boxes aren't big...........I use 2-5 cubic foot EBS Adire alignment 12" Shivas in a single box. I don't know what it weighs, since I can't lift it , but it doesn't move around alot when bumpin'.

    Edit:.............Sorry guys this is my HT sub. I didn't see this was in the CA forum when responding. In my car I use 2 boxes also, but they are .7 cu. ft. sealed with 10" ID4s.
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

    2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
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  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    Dennis Gardner wrote:
    I didn't see this was in the CA forum when responding.
    it's okay, we'll forgive your trespass... this time... :D
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    edited November 2005
    With all threads having the same background with this version of vbulletin, I get lost on occasion. No more black backgound to warn me of my wander. :D
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

    2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    neomagus00 wrote:
    fyi, it's "slash img" without the "src" at the end...

    and could you fit them vertically? cause i rather like the box you have drawn...
    damn, thats what my problem was!!!! i was trying to figure it out and i was pushing the "back" button then editing it again and again, all out of the blues, BAM!! all of them showed up, oh well, those internet design classes didnt really stick. :rolleyes:
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    Dennis Gardner wrote:
    Your boxes aren't big...........I use 2-5 cubic foot EBS Adire alignment 12" Shivas in a single box. I don't know what it weighs, since I can't lift it , but it doesn't move around alot when bumpin'.

    Edit:.............Sorry guys this is my HT sub. I didn't see this was in the CA forum when responding. In my car I use 2 boxes also, but they are .7 cu. ft. sealed with 10" ID4s.
    Well the manufactures reccomended, 1.3 cubic feet per sub, so thats what i was going by.
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    I think im making this way more complicated than it is......????

    and i havent even came to the right solution, any ideas how to make a trapazoidal box exactly 1.3 cubic feet?
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • Still learning
    Still learning Posts: 107
    edited November 2005
    Oh by the way i know you guys are going to hate me for this but, here are the subs that im bulding the box for,

    Right Here

    What can i say, i saw some guy who had them in the 1.3 cubic foot box, and they sounded great, i have no clue why, but i get sony subs for just about free, because of a guy i know and his store went to ****, so i get the subs for cheap. Its an experement, plus ill probibly end up selling them in the end. I havent herd any systems that can beat mine(with the same stats of course)
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • MacLeod
    MacLeod Posts: 14,358
    edited November 2005
    Dennis Gardner wrote:
    Your boxes aren't big...........I use 2-5 cubic foot EBS Adire alignment 12" Shivas in a single box. I don't know what it weighs, since I can't lift it , but it doesn't move around alot when bumpin'.

    Edit:.............Sorry guys this is my HT sub. I didn't see this was in the CA forum when responding. In my car I use 2 boxes also, but they are .7 cu. ft. sealed with 10" ID4s.

    LOL!! I was about to say, 2-5 cubic feet!!! My gawd!!


    If the manufacturer recommends 1.3 ft3 thats what you should go with. After all, theyre the ones that designed it and will know what works best with it.

    Here are some links to great box construction tutorials. Its basic stuff but lots of good info nonetheless.

    MTX website

    JL Audio website
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D
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  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    not quite complicated enough, you were missing the width of the box :p... and yes, i can come up with a box design, but i need to know how steep you want the front face... the attached box gives you a volume damn near 1.3, all you do is build a pair, having them share one wall... and it allows you to mount a 12" sub, unlike the ones you were designing :D

    p.s. measurements are in inches... and the pic is roughly to scale, but the face is at roughly 35 degrees from vertical in real life...
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • hellohello
    hellohello Posts: 428
    edited November 2005
    We dont hate you for buying sony, what works for you works for you. Just probably wouldnt work for some of the people here :P
    Picking ones nose signifies a strong sense of self discovery :)

    System in the works: ;)
    PP 6V6 with 12ax7 pre ~ 20 watts
    15" Jensen MOD 8ohm ~ 97db SPL
    DiMarzio HS3 and/or Tone Zone S
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    neomagus00 wrote:
    not quite complicated enough, you were missing the width of the box :p... and yes, i can come up with a box design, but i need to know how steep you want the front face... the attached box gives you a volume damn near 1.3, all you do is build a pair, having them share one wall... and it allows you to mount a 12" sub, unlike the ones you were designing :D

    p.s. measurements are in inches... and the pic is roughly to scale, but the face is at roughly 35 degrees from vertical in real life...

    What program did you use to make that design?
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • Still learning
    Still learning Posts: 107
    edited November 2005
    I think i figured it out, box, buy splitting the box in half it make two trapidoidal boxs, thus the FORMULA for finding the surface area of a trapazoid is A=(b1+b2)/2


    So i found that there is 2246.4 inches Cubed in 1.3 cubic feet,(i converted that because the measurements im using in inches) the hight has to be at least 14 inches so i started with that, i divided 2246.4 inches cubed by 14 to get the needed surface area of the base.

    I played around with different dementions untill i got the box to 2245.95 inches cubed, not that is extremely close to 1.3 cubic ft (2246.4 in cubed) ill post the data later just so we can double check.

    Thanks
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • hellohello
    hellohello Posts: 428
    edited November 2005
    the12volt.com has box calculators
    Picking ones nose signifies a strong sense of self discovery :)

    System in the works: ;)
    PP 6V6 with 12ax7 pre ~ 20 watts
    15" Jensen MOD 8ohm ~ 97db SPL
    DiMarzio HS3 and/or Tone Zone S
    · Share on FacebookShare on Twitter
  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    Still learning wrote:
    What program did you use to make that design?
    my hand and a couple scribbles on a piece of paper :p

    also note that, since you're doing internal dimensions, your minimum is about 12.5" for the mounting face of the sub, not necessarily 14"...
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    Yea,but the outside edges of the sub are 13.85 inch wibe so you know

    P.S, your trying to tell me that drawing is drawn with paper?
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    no, i drew a scribble and then used Paint to draw that image... do you really think a physics guy has handwriting like that?!

    and yes, i suppose that 14" couldn't hurt, but you don't NEED more than 12.5"...
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    Here are the plans, what do you guy think?

    http://tinypic.com/fbjn00.jpg

    Im only about 10 pices of paper short.

    Oh and you meant to say that, i could mount the sub with the edge over the sides and the mounting holes right at the edge? This is alredy the smallest 2 12s box i have ever seen.

    P.S. A couple of random questions, With the sealed and ported box thing, how mush of a "bass" level difference, because you know, you get more pound when it ported? And why is the box so small? I would have thought that the box would be way bigger, i mean the subs are a half of an inch from toutching eachother and a half and inch maby even 1/8 of an inch form the edge, this box is tiny. One more, if i had a 10" sub that could withstand 300 watts RMS, and a 12" 500 watts RMS, would the 12 pound harder if i had the same(200 watt RMS) amp hooked up to bolth of them?
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter
  • neomagus00
    neomagus00 Posts: 3,899
    edited November 2005
    for a given wattage, a 12 should hit deeper, and probably louder too (check the sensitivities)... and the canonical figure for ported is +3dB over sealed... and as long as the box is the right volume, that's all that matters... is that the final design?
    It's not good, very fundamentally simply not good. - geolemon

    "Its not good enough until we have real-time fearmongering. I want my fear mongered as it happens." - Shizelbs
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  • Still learning
    Still learning Posts: 107
    edited November 2005
    Well thats the basic layout, i plan on squaring everything out, i will then fill all the cracks, and screw holes with wood paste, ill sand it down to make everything smooth and make the corners nice and even. I think ill paint it silver with metal flake, and put like 10000000 coats of clear on it. All post pics if it when its finished, witch will be in a month or so(im in no hurry+i have other demands)


    P.S. This is kind of a nother post but, what method do you guys use to seal a box? I just put the whole box together except the back, then i seal the box in all of the exposed cracks, i.e: the face to the sides, Then i put the back on and seal the back to the sides through the speaker hole(s). Do you guys have a easyer method? this way is kind of a paine, or is this how you have to do it. I cant think of another way.
    KDC-MP5028- Kenwood deck

    Phoenix Gold speaker wire

    Alpine 6-1/2" Type-R Coaxial 2-Way Speakers- SPR17LP-, in side doors

    Alpine 5x7" Type R speakers -SPR-574A-, in the back.

    2 Alpine type R subwoofers in custom box

    1000 watt Alpine -MRD-M1005- AMP

    -Price invested- Over 1500$

    Not the absolute best, but it works like a champ, you can hear it from like 2 or 3 blocks away from your stand point.
    · Share on FacebookShare on Twitter