Is this a good box for an HX2 12?

[juan_caliente 10+ year member]

Hello Everyone,

I built a box for an RFD2212 HX2 12 D4 two weekends ago. It is 3/4 ply, not particle board 38x15x15 with a slot port 13.5x31x3. I used the RE enclosure calculator and it seems it should be about 2.8 cu ft tuned to 29 hz. I have this powered off of a Crunch PZI1500.1 mono at 2 ohms. I have 1/0 power and ground. My question is that my box seems to crush the lows but higher bass notes sound almost non existant. For now I have the factory mids and tweeters with a high pass set at 90hz and I have the bass boost on the PZI at 0, Subsonic filter set at 25~hz and the low pass set at about 100hz. Specifically when I play songs like Big Tymers Still Fly, the low low notes slam, but the upper bass sounds very quiet and doesn't hit hard at all. Can anyone help me determine if this is a good box for this woofer?

Thanks,

John //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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[Qbenjamin 10+ year member]

I dunno what the answer to your problem is, but I do know that most people use MDF or Birch to build their boxes. Do you have any pictures of your build? Was this your first enclosure? There are many variables to discuss when trying to figure out why a sub isn't sounding right in a ported box.

 

[plugitin 5,000+ posts]

you are also tuned pretty low...

 

[gboo559 10+ year member]

29hz is LOW

and how high are you talking?

 

[csu87 10+ year member]

you are tuned to 29hz so that is why the higher notes roll off. if you want higher bass frequencies then tune higher. simple as that

 

[juan_caliente 10+ year member]

Thanks for the responses. I don't have any pics right now, I did use Birch Ply. I thought given the fs was about 23hz, I think, I thought 29 would be good. I do not notice the missing upper bass except on certain songs. I am sure this will be less noticible when I upgrade my midbasses in my doors. I just was suprised at the steep roll off. I have built boxes before, but always sealed. This was my first ported, and I am impressed, playing excurion tests it goes all the way to the bottom without bottoming out. I think the output rolls off at about 70-80hz. Oh and it is in the back of my 98 Blazer, sub up port to the side.

Thanks again for any input.