MM2084DVC questions

1hawaii50
1hawaii50 Posts: 26
edited July 2008 in Subwoofer Hookup & Bass Management
I'm planning on adding one of these to the trunk of my 07 Altima and powering it off of a Sony XM-1S amp (290w @4 ohms, 500w @2 ohms). Would it be best to run this sub with both voice coils in parallel @ 2 ohms, or should I just wire to one coil and run the amp at 4 ohms. If I run it in parallel @2 ohms, will each coil see 500W, or will they get 250W each? Or am I totally off base here?

Also, what is the volume of the woofer (that I have to deduct from my box specs)? If I'm figuring my box volume out right, these things only need a 10"h x 10"w x 10"d box? Thanks for the help, this is my first foray into subs and I'm just trying to get it right.
Post edited by 1hawaii50 on
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  • Eric W
    Eric W Posts: 556
    edited July 2008
    Parallel the voice coils for a 2 ohm load. Each coil would see ~250 watts each. Since it's a 1 channel amp and a DVC sub- there's no way to run it at 4 ohms anyway (unless you drive only one coil- not recommended).

    Are you looking at ported or a sealed box?
    -Eric
    -Polk Audio
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  • [Deleted User]
    [Deleted User] Posts: 0
    edited July 2008
    Try to stay away from equal dimesions for your enclosure
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  • 1hawaii50
    1hawaii50 Posts: 26
    edited July 2008
    Eric Wong wrote: »
    Parallel the voice coils for a 2 ohm load. Each coil would see ~250 watts each. Since it's a 1 channel amp and a DVC sub- there's no way to run it at 4 ohms anyway (unless you drive only one coil- not recommended).

    Are you looking at ported or a sealed box?

    I'm going to build a sealed box, and thanks for the info as far as voice coils and ohms, that's what I needed to know. If the dimensions of the box should not be even, what if I went with a 12" face (where the sub would mount), with 10" back and sides? To fit it in my trunk where I need it to go, if you are looking at the front of the box/looking at the sub, the right side of the face would be at a 90 degree angle to the right side of the box. The right side of the box would be at a 90 degree angle to the back side of the box. The face of the box would be 12" across and would be at an angle less than 90 degrees where it meets the left side. Where the left side meets the back would be at an angle slightly greater than 90 degrees. Hope this makes some sense. I just don't want to go too large on the box, as the sub calls for a small box (.35cf I believe).
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  • B2Bomber
    B2Bomber Posts: 24
    edited July 2008
    if I may suggest, there're sub box examples back in the polk site. why don't you try them? regarding the speaker displacement, why are you asking? are you going to invert the sub? if not, the recommended box volume includes the speaker displacement already so no need to add that to the recommended box volume.

    .02 hth.
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  • 1hawaii50
    1hawaii50 Posts: 26
    edited July 2008
    B2Bomber wrote: »
    if I may suggest, there're sub box examples back in the polk site. why don't you try them? regarding the speaker displacement, why are you asking? are you going to invert the sub? if not, the recommended box volume includes the speaker displacement already so no need to add that to the recommended box volume.

    .02 hth.

    I can't use any of the box examples, as I need/want to build a box to utilize the rear "corner" of my trunk so as to keep as much usable trunk space as possible. If I build a custom box, I can utilize the corner and keep most of the trunk open. This is our family car, and we often need the trunk space. I wasn't sure if the box dimensions included the sub or not, that is why I asked. My box is going to be between .35 and .4 cubic feet, I didn't want it to be less than the recommended specs once the sub was added.
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  • B2Bomber
    B2Bomber Posts: 24
    edited July 2008
    as I mentioned, according to Polk CS, the recommended box volumes include the speaker displacement already.
    with regards to the physical lxwxh of your box, you can play around with your dimensions as long as you come up with the same internal volume as recommended... and so that you don't end up with a cube, try using the golden ratio too for lxwxh.

    .02 hth.
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  • 1hawaii50
    1hawaii50 Posts: 26
    edited July 2008
    B2Bomber wrote: »
    as I mentioned, according to Polk CS, the recommended box volumes include the speaker displacement already.
    with regards to the physical lxwxh of your box, you can play around with your dimensions as long as you come up with the same internal volume as recommended... and so that you don't end up with a cube, try using the golden ratio too for lxwxh.

    .02 hth.

    Not sure what the golden ratio is, but, if you look at my enclosure from the top down, there isn't one 90 degree angle. Looking at it from the side, there are only 2 90 degree angles, so I most definately won't end up with a cube. If I'm figuring the volume correctly, I should be in the neighborhood of .4 cubic ft. With the goofy shape of the box, I'm doing a little guessing in the figuring.
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