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Old 08-02-2012   #1
 
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Default Need help designing sealed enclosure for 2 10" Polk db1040

Hey all, I just got this subwoofer mainly for techno music and will have a professional Build an enclosure for it and another that I plan on getting in the near future.

These are the specs:

Polk audio db1040

Ideal Sealed Box Volume (cubic feet): 0.66
Size 10 -inch
Impedance 4 ohms
Cone Material Polypropylene
Surround Material Santoprene rubber
Ideal Sealed Box Volume (cubic feet) 0.66
Ideal Ported Box Volume (cubic feet) 1.25
Port diameter (inches) 4
Port length (inches) 12
Free-Air No
Dual Voice Coil No
Sensitivity 86 dB at 1 watt
Frequency Response 28 - 200 Hz
RMS Power Range (Watts) 50-270
Peak Power Handling (Watts) 540
Top Mount Depth (inches) 5 7/16
Bottom Mount Depth (inches) 5 7/8
Cutout Diameter or Length (inches) 9 1/16
Vas (liters) 28.3
Fs (Hz) 35
Qts 0.55
Xmax (millimeters) 7.5

http://www.crutchfield.com/S-Q8jrqOE...ml#details-tab


Now I told him about the ideal box volume of .0186 cubic meters (.66 cubic feet) and he basically drew something with these specs to house two of these subs:

Width: 75cm
Height: 38cm
Depth: 30cm

That has a volume of 0.0855, or .04275 X 2


That seems much larger than the recommended size. Instead of blindly listening to "the professional", I would appreciate some input for the perfect dimensions.


Thanks
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Old 08-02-2012   #2
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Default Re: Need help designing sealed enclosure for 2 10" Polk db1040

You are correct. Those numbers, assuming .75" nominal board thickness and a driver displacement of .09cft, would yield roughly 1.07 depending on shared or seperate chambers. That is quite a bit large and not nearly enough to turn it into a ported enclosure. If you can, I would suggest modeling the sub in something like WinISD at both .66 and 1.0 and see how they compare.
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Old 08-03-2012   #3
 
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Default Re: Need help designing sealed enclosure for 2 10" Polk db1040

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Originally Posted by 07azhhr View Post
You are correct. Those numbers, assuming .75" nominal board thickness and a driver displacement of .09cft, would yield roughly 1.07 depending on shared or seperate chambers. That is quite a bit large and not nearly enough to turn it into a ported enclosure. If you can, I would suggest modeling the sub in something like WinISD at both .66 and 1.0 and see how they compare.
Cool thanks for your reply.

I was thinking something more along the lines of 26" x 12" x 11"
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Old 08-03-2012   #4
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Default Re: Need help designing sealed enclosure for 2 10" Polk db1040

You will need to go slightly larger then that if that is outside dimensions due to the subs displacement. With thise numbers for a two chamber box it comes out to .685. The subs are a tad more then .02cft worth of displacement. But the POLK site has been changed and does not seem to have the box recommendation pages any more. That is where I had found the displacement specs for all my MM's.
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Old 08-03-2012   #5
 
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Default Re: Need help designing sealed enclosure for 2 10" Polk db1040

Quote:
Originally Posted by 07azhhr View Post
You will need to go slightly larger then that if that is outside dimensions due to the subs displacement. With thise numbers for a two chamber box it comes out to .685. The subs are a tad more then .02cft worth of displacement. But the POLK site has been changed and does not seem to have the box recommendation pages any more. That is where I had found the displacement specs for all my MM's.
Ah, then would this be more appropriate?

Sound Ordnance™ Bass Bunker Sealed dual 10" subwoofer enclosure (Model BB102-75S) at Crutchfield.com

Box Type Sealed
Number of Boxes 1
Number of speakers Per Box 2
Speaker Size 10
Cutout Diameter or Length (inches) 9 1/4
Maximum Speaker Depth (inches) 8-1/2
Box Volume (cubic feet) 1.52
Tuning Frequency N/A
Height (inches) 13-9/16
Width (inches) 26-13/16
Depth (inches) 11-5/8
Second Depth (inches) 8-5/8
Wood Thickness (inches) 5/8
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Old 08-03-2012   #6
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Default Re: Need help designing sealed enclosure for 2 10" Polk db1040



That has .76 per chamber gross so it should be only slightly larger then the .66 after sub displacement. The sub is probably about .06 cft but could be slightly more due to it's shape. Either way the box is within the range of the speakers and is on the larger side of the range scale. This means that within the subs box volumn range the sub will have a tendancy to be smoother and not as boomy as if you were off the same amount in the smaller direction.

With the little difference though, you may not even be able to tell the difference between this box and one that is .66cft. The other thing is that you can always add a piece of wood in the box to add extra displacement and achieve the .66cft if it just sounds a tad off. The smaller box size you listed before was not all that far off and is most likely still in the subs usable range and you could always add some polyfill in there. But while that helps many times, it is possible that Polks rec size already accounts for the use of polyfill. Again the difference between these boxes and the recommended size is marginal so there may not be too much difference here. I , mysef would still prefer to be slighty over then under.
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