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    shnosh's Avatar
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    Sub Box Help

    I recently got two Cerwin Vega HED 10" Duel voice coil speakers. I was wondering if any one has a proven sugestion on the best type of box to build, specs for a box to get the most out of the speakers, or a website that has sub box plans. The subs sugest 1.0 cubic foot of air space for each, but I know that is not always what people have found to work best. Also it is going in the back of my 2002 PT Cruiser so I have a bit of space to work with.

    Thanks!







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    [quote]Originally posted by shnosh:<br /><strong>I recently got two Cerwin Vega HED 10" Duel voice coil speakers. I was wondering if any one has a proven sugestion on the best type of box to build, specs for a box to get the most out of the speakers, or a website that has sub box plans. The subs sugest 1.0 cubic foot of air space for each, but I know that is not always what people have found to work best. Also it is going in the back of my 2002 PT Cruiser so I have a bit of space to work with.

    Thanks!</strong><hr></blockquote>

    Let me know what kind of sound you are lookin for. Do you want slound quality? Do you want spl ? Do you want a little of both ? I can help you design one.



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    [quote]Originally posted by ramos:<br /><strong>

    Let me know what kind of sound you are lookin for. Do you want slound quality? Do you want spl ? Do you want a little of both ? I can help you design one.</strong><hr></blockquote>

    I would have to say a little of each. The stock system sounds real good but it is missing both the punch of higher bass frequencies and the low boom. That is why I wanted to add the sub. I got the Vegas for Christmas and a Sony Amp (xplod xm 1502sx, I know not the best out there but it will have to do for a while) for my B-day five days later. The area of the trunk is 36" wide, 18" high and the depth I would like to keep as short as possible so I don't lose all the trunk space. I appreciate your help and thanks for the response.

    Robbie




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    Can you swing 36"L x 18"T x 8"D. Because according to good ole Bass box pro 6. This would make a very good sealed box with great low end extension. It would be 2.14 cft internally assuming you will be using 3/4" MDF. THe measurements are external dimensions. Don't use a divider in the middle of the box. The subs will share a common chamber. Use a couple bags of polyfill. The stuff you use to stuff pillows with. Walmart has it <img src="smile.gif" border="0"> And wire each sub in parallel. This will make each sub 2ohm. Then run each sub to it's own channel. You will get about 190w a sub. You could bridge your amp but from personal experience I can tell you your amp won't be able to handle the load.



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    [quote]Originally posted by ramos:<br /><strong>Can you swing 36"L x 18"T x 8"D. Because according to good ole Bass box pro 6. This would make a very good sealed box with great low end extension. It would be 2.14 cft internally assuming you will be using 3/4" MDF. THe measurements are external dimensions. Don't use a divider in the middle of the box. The subs will share a common chamber. Use a couple bags of polyfill. The stuff you use to stuff pillows with. Walmart has it <img src="smile.gif" border="0"> And wire each sub in parallel. This will make each sub 2ohm. Then run each sub to it's own channel. You will get about 190w a sub. You could bridge your amp but from personal experience I can tell you your amp won't be able to handle the load.</strong><hr></blockquote>

    <br />Thank you so much for your time and information. I will be building it this weekend and I will let you know how it works out if you want.

    Thanks again!

    Robbie




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    Glad to help. Let me know how it sounds.



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    HA! This is funny. I just built a sub cabinet last weekend with exactly the same C-V speakers and nearly the same amp, an Xplod 760.

    I went for a ported isobaric, which is tuned for low frequency response. It sounds really good. However I did not have as much room as you to work with, my box is only about 0.8ft^3.

    If you build a large sealed box and stuff it with polyfill like the above person mentioned it should sound really good. You could get higher sound output with a ported setup but with that amp and those speakers the sealed box should be plenty loud in a PT Cruiser. Good luck!




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    [quote]Originally posted by &lt;ZX-Tex&gt;:<br /><strong>HA! This is funny. I just built a sub cabinet last weekend with exactly the same C-V speakers and nearly the same amp, an Xplod 760.

    I went for a ported isobaric, which is tuned for low frequency response. It sounds really good. However I did not have as much room as you to work with, my box is only about 0.8ft^3.

    If you build a large sealed box and stuff it with polyfill like the above person mentioned it should sound really good. You could get higher sound output with a ported setup but with that amp and those speakers the sealed box should be plenty loud in a PT Cruiser. Good luck!</strong><hr></blockquote>

    That is too much of a coincidence. And it lets me know that the components sound good which is always something that you worry about when you get new stuff.

    Thanks!




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    </font><blockquote><font size="1" face="arial">quote:</font><hr /><font size="2" face="arial">Originally posted by ramos:<br /><strong>Can you swing 36"L x 18"T x 8"D. Because according to good ole Bass box pro 6. This would make a very good sealed box with great low end extension. It would be 2.14 cft internally assuming you will be using 3/4" MDF. THe measurements are external dimensions. Don't use a divider in the middle of the box. The subs will share a common chamber. Use a couple bags of polyfill. The stuff you use to stuff pillows with. Walmart has it <img border="0" title="" alt="[Smile]" src="smile.gif" /> And wire each sub in parallel. This will make each sub 2ohm. Then run each sub to it's own channel. You will get about 190w a sub. You could bridge your amp but from personal experience I can tell you your amp won't be able to handle the load.</strong></font><hr /></blockquote><font size="2" face="arial"><br /><br /><br />Thank you again so much for all of your help. I built the box this weekend per the specs that you gave me and it sounds great. A long time ago I had a system in my Nissan Sentra (don't laugh) with two Fosgate 12" and it didn't hit as hard or sound as accurate. It was great too because I built the box, mounted the amp, wired everything, and it worked first off. This has never happened to me before. It seems like there was always a 'one speaker didn't work' or engine noise or something not right. Anyway, it went real smooth and once again thanks for your help <img border="0" title="" alt="[Smile]" src="smile.gif" />




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    No problem man. Glad to help <img border="0" title="" alt="[Smile]" src="smile.gif" />



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    I have built custom boxes for over a year and I have noticed that the best kind of box for a similar set as yours is either a dual ported bandpass, or a custom-fit sealed box. If you choose a bandpass, be sure that the ports are on the top, and the plexiglass is sealed properly. If you choose a custom built sealed, be sure that it is made out of MDF (Maximum-Density-Fiberboard) and sealed with an all-purpose oil based caulk. The sealed box can be made to fit anywhere desirable, if custom built. If it's a standard box, rectangular, wedge, or trapezoidal shape won't really made a difference. Either way, since the subs are in the cabin and not closed in a trunk like a car, the bass quality should be exceptional.




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    Originally posted by forum_punk
    I have built custom boxes for over a year and I have noticed that the best kind of box for a similar set as yours is either a dual ported bandpass, or a custom-fit sealed box. If you choose a bandpass, be sure that the ports are on the top, and the plexiglass is sealed properly. If you choose a custom built sealed, be sure that it is made out of MDF (Maximum-Density-Fiberboard) and sealed with an all-purpose oil based caulk. The sealed box can be made to fit anywhere desirable, if custom built. If it's a standard box, rectangular, wedge, or trapezoidal shape won't really made a difference. Either way, since the subs are in the cabin and not closed in a trunk like a car, the bass quality should be exceptional.
    MDF - medium density fiberboard




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    Also, when building a box above the specs for a given sub there is really no need to use polyfill, no point in giving the subs the "illusion" they are in a larger box. Unless the box is barely above manufacturers specs for min. box volume.



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