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  1. #1

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    Default MM2104 in a .5 box?

    Sounddomain has these at a good price ($100) and I was thinking if I could make one work cause Id really like to go all Polk for speakers.

    Here's my thinking---->
    The MM handles 300 watts and Ill be giving it a little over 350 and we all know how well MM subs like overpowering. But rather than going with the recommended .66 box if I were to go with a .5 wouldnt that let it handle those extra 50 watts?

    The reason I would be going with a .5 is thats all the room Ive got and Ill be lucky if I can come up with that much!

    So we've got a MM2104 in a sealed .5 ft3 box getting 350+ watts. Whatcha guys think? Think it would sound like **** with too much power in too small a box or would they offest each other enough to sound pretty good.

    Ive heard the MM2104 at Tweeter and it sounds great! I dont wanna spoil it.
    Last edited by MacLeod; 10-20-2004 at 08:52 PM.
    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

  2. #2

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    I really dont know what I'm talking about but I think that you'd be exceeding the max thermal power handling regardless. The box volume would make it so it moved too much but it still might fry something? I'm not really sure. I'm just taking a guess cause I thought I read something on that a while ago.
    2005 Subaru Impreza WRX

  3. #3

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    Could that possibly be the reason we hear about so many blown momo subs? That their 500 watt rating. or 400 for the MM2's...is their thermal rating? That maybe in their recomended .66ft^3 box, they need less then the 500 or whatever watts to reach xmax? That could be why Polk never had any problems with the surround hitting the grills...
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  4. #4

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    I was going off my MTX 8" I have now. Ive got it in a .29 box and its recommended for a .37. Ive also got 350 watts going to it when its rated at 150! And to date, its not so much as whimpered!
    polkaudio sound quality competitor since 2005
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  5. #5

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    Originally posted by spwuinmk67
    Could that possibly be the reason we hear about so many blown momo subs? That their 500 watt rating. or 400 for the MM2's...is their thermal rating? That maybe in their recomended .66ft^3 box, they need less then the 500 or whatever watts to reach xmax? That could be why Polk never had any problems with the surround hitting the grills...
    This is not an issue since the MM12's only come with the box POLK makes.

    Macleod, like spwuinmk67 (what is your name anyway?) said, putting the sub in a smaller box wouldn't let it handle more power since it's a thermal rating. There's two main ways to blow a sub: exceeding its thermal rating(overpowering no matter the box size), and overexcursion - too much power for the box size, even if you're giving it less than its thermal rating. Your idea would fall under the first category.
    http://www.silverdragon.com/punkie/c...net.idiot.html - Read it, know it

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  6. #6

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    Well even if you get them without Polk's box, that could be why Cody blew so many...My name is Bill btw.
    1993 Ford Ranger super cab:
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  7. #7

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    {sigh} Oh well. I discovered that the IDQ 12" would work in a .55 box and handle 350 watts and I was jumping up and down! Then I went outside and measured and there is really no way I can fit a 12. :(

    I guess Im stuck with the Kicker L7. Its the only sub that will fit with little problem.

    The good thing is I like to be different and there aint a whole lot of people out there competing in SQ comps with 8's much less a single 8!
    polkaudio sound quality competitor since 2005
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    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

  8. #8

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    you could always call polk up and ask what the thermal power rating is. cause as we all know, cody quotes the 1600 watts rms of his brahmas, but if he put them in the reccommened box and fed them 1600 watts all the time they would tear themselves apart - 1600 watts is when stuff starts to melt. this can happen at no excursion, btw - if you feed 800 watts into each VC but with the signals inverted, you get no cone movement but 1600 watts of power in the sub... you could probably sit there and watch the VC burn... so, i'd say call polk and ask what the thermal rating is, then make sure you don't go over that OR over excursion, whatever's less.
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  9. #9

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    i doubt its thermal, but i dont know
    if at all possible, id get an IDQ---they are one of the best SQ subs on the market
    or how about a koda 10?
    if polk rates their subs thermally, thats not very smart on their part
    they dont market their subs to the people that would know what thermal rating is...
    -Cody
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  10. #10

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    The IDQ 12 wont fit, at least with my meager talents. And the IDQ 10 only handles 250 watts!

    I really want a 10 so I still may go for the MM2104 cause I really like the way they sound and stick it in the .5 box with 350 watts and see how long it lasts. Who knows, it may just suprise us.
    polkaudio sound quality competitor since 2005
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  11. #11

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    how about an Adire Shiva???
    -Cody
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  12. #12

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    Originally posted by exalted512
    how about an Adire Shiva???
    -Cody
    Shiva would handle the power, but it's still a 12" sub so he couldnt' fit it.
    http://www.silverdragon.com/punkie/c...net.idiot.html - Read it, know it

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  13. #13

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    Plus I dont want to wait 3 months to get it! ;)

    I think the Momo will fit the bill. Its not that big and even tho Ill be overpowering it by 50 watts, I dont listen to any bass heavy music so I shouldnt have a problem. Im gonna keep my eyes open whilst I save some scratch but I would like to show up at MECA represent'n (a little hip hop lingo there) Polk. The show I just went to NOBODY had Polk anything. Memphis, Audiobahn, JL, RF were the main gear. I did see a Planet Audio and I think even an XXX sub in the mix.

    Any advice from the Polk installers would be appreciated!! :D
    Last edited by MacLeod; 10-18-2004 at 07:12 PM.
    polkaudio sound quality competitor since 2005
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  14. #14
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    When a subwoofer is installed in an enclosure that is smaller then the recommended enclosure volume, this can lead to a premature Voice coil failure due to the limiting the cone displacement from the woofer being installed into a smaller sealed enclosure. The voice coil winds up turning into a toaster due to the excessive current flowing through the voice coil before it fails. By limiting the excursion of the driver we are also restricting the air flow in the magnet gap and pole piece through the air vents that are designed to cool the voice coil. "Who's cookin' ?" "Ooh that smell.... can't you smell that smell?"

    The smaller box volume also changes the "Q" of the system
    Depending on the amount of damping material installed into it. The QTC is determined by tuning frequency of the enclosure and the Q of the driver being used.

    For example if you are forced into installing the woofer into a smaller box volume of .5 cubic feet that is heavily stuffed, this system will have a QTC of 0.669. The end result is a very lean sounding bass response along with reduced efficiency. Now if we just line the internal walls with polyfill sheets, the efficiency will improve slight and the QTC is now 0.74. This will a better sounding box just by reducing the amount of polyfill installed into the enclosure. Hope this makes some sense. My advice use the factory recommended sealed enclosure volumes and play with the stuffing instead of potatoes.
    Last edited by Kim; 10-22-2004 at 03:55 PM.

  15. #15

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    Thanks Kim, that answers a lot. I wasnt sure how the SQ would be affected and as this is for competition purposes, thats my primary concern.

    Well, I guess its back to the drawing board. :(
    polkaudio sound quality competitor since 2005
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    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

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  16. #16

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    Default So...

    I'll just put my DB12's back into that dual 1.2 box... I'll never have to worry about them cooking... just throwing themselves off the basket with my new 1k amp.

    (but.. then again I need car parts waaay before MDF... can't stop the car with subs... well, at least I wouldn't want to see em go that way...)
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