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Discussion Starter · #1 ·
Kevin gave me this design. Can someone run the calculations? Driver will be Shiva-X. What length ports do I need? What tuning will this give me? Which amp would be best,300 watt or 500 watt? Design and driver specs below.


SPECIFICATIONS

Fs: 19.6 Hz

Le: 0.90mH

Re: 3.6 Ohms (Voice Coils wired in parallel)

Qms: 2.60

Qes: .46

Qts: 0.39

Mms: 140g

Cms: 0.47 mm/N

Vas: 169L

Sd: 506 cm^2

Vd: 2.65L

BL: 11.66

X-max: 27mm

Pmax: 600W

SPL: 86.3 db/1W/1M, 89.1 dB @ 2.83Vrms


/Users/mike/Desktop/Large Ported Shiva Front Port.skp


Thank you.
 

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Discussion Starter · #3 ·

Quote:
Originally Posted by mjg100 /forum/post/15515956


Kevin gave me this design. Can someone run the calculations? Driver will be Shiva-X. What length ports do I need? What tuning will this give me? Which amp would be best,300 watt or 500 watt? Design and driver specs below.


SPECIFICATIONS

Fs: 19.6 Hz

Le: 0.90mH

Re: 3.6 Ohms (Voice Coils wired in parallel)

Qms: 2.60

Qes: .46

Qts: 0.39

Mms: 140g

Cms: 0.47 mm/N

Vas: 169L

Sd: 506 cm^2

Vd: 2.65L

BL: 11.66

X-max: 27mm

Pmax: 600W

SPL: 86.3 db/1W/1M, 89.1 dB @ 2.83Vrms


/Users/mike/Desktop/Large Ported Shiva Front Port.skp


Thank you.

I could not get sketch-up drawing that was emailed to me to show up in the above post. I calculated interior volume (exterior size 20"W x 27"D x 27"H) and I get 6.06 CF. Is this the volume that you would use? 20" width is the only limit that I have to maintain. The two 4" ports will be full length (17").
 

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Discussion Starter · #6 ·

Quote:
Originally Posted by Stephen Hopkins /forum/post/15523994


My only question would be why not do a slot-port to avoid the cost of the precision ports?


I like NEO DAN'S design, but I would need to turn it on it's side and reduce the 24" measurement to 20". I need max height to be 20". Can anybody tell me what length ports I would need?
www.avsforum.com/avs-vb/showthread.php?p=15525822#post15525822
 

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Discussion Starter · #7 ·
Decided to use MDO sheathing in place of MDF. MDO is a little bit heavier and denser and I have a bunch of scrap pieces that I can use. I got all of the pieces cut to size and I am working on making the holes. Should do assembly of the box tomorrow. Ports should arrive Wednesday. I do not know when the driver will be hear. Does Kevin Haskins send email notification of shipment?
 

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Discussion Starter · #8 ·
Box is assembled. I glued and screwed it. I used trim head tek screws because they leave a small hole. I took some pictures, but I will have to wait until I get home tonight to upload them. Box alone weighs 85 pounds. Total weight of sub should be around 140 when completed.
 

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The MDO should work well... how are you planning on finishing it? If you're planning on painting, you may want to seal/bondo where there are exposed ends of a piece of wood, otherwise it will absorb paint differently than the primed face of the MDO.
 

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Discussion Starter · #10 ·

Quote:
Originally Posted by Stephen Hopkins /forum/post/15554383


The MDO should work well... how are you planning on finishing it? If you're planning on painting, you may want to seal/bondo where there are exposed ends of a piece of wood, otherwise it will absorb paint differently than the primed face of the MDO.

That is what I am trying to decide and am having a hard time with the decision. Sub will be painted flat black or satin black. The sub is going into a dedicated all black room and you will not be able to see it very well. I hate to put all that work into it when you will not be able to see it, but I also like for my work to look good. I went ahead and put a radius on all of the edges with a 1/4" router bit, so now I am down to making the finish decision. If I decide to finish it nicely I will use durobond 90 or bondo.
 

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Discussion Starter · #14 ·

Quote:
Originally Posted by Stephen Hopkins /forum/post/15599374


Should sound great. How did the finish come out?

I decided to just do a little bit of filler and paint it flat black. The sub is going in the front of my room right under my screen and I do not want reflections. If the sub was going elsewhere I would have taken more time and used a high gloss lacquered finish. As it stands right now I am wondering if I will need to cover the top of the sub with black cloth or velvet.
http://i243.photobucket.com/albums/f...m/IMG_0340.jpg
http://i243.photobucket.com/albums/f...m/IMG_0338.jpg

The white streaks are from wiping the sub with a damp paper towel.
 

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Looks good. Something textured (a lot of people use spray truck bed liner) would hide a lot of the imperfections in the finish without adding much, if any, reflection. Latex based paint brushed/rolled on also often has a more uniform finish and is much more forgiving on many surfaces.
 

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Discussion Starter · #16 ·

Quote:
Originally Posted by Stephen Hopkins /forum/post/15603076


Looks good. Something textured (a lot of people use spray truck bed liner) would hide a lot of the imperfections in the finish without adding much, if any, reflection. Latex based paint brushed/rolled on also often has a more uniform finish and is much more forgiving on many surfaces.

It already looks better than the box of my ED A7S-450, but the box does not show.
http://i243.photobucket.com/albums/f...m/P1000635.jpg
 

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Discussion Starter · #18 ·

Quote:
Originally Posted by Stephen Hopkins /forum/post/15605178


That is a beautiful little niche! Did you build that yourself? Also, what kind of inwalls are you using?

Yes. I did all the work in that room except for the wood floor, drywall and most of the exterior framing. I am using RBH SI-760's. They are a lot bigger than what you see. www.rbhsound.com/si760.shtml
 
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