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Old 11-05-2014, 09:25 PM
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Default HDS3 10" Port Area

Is 37.5in^3 enough port area for 2 Soundqubed HDS3 10"s in a 3.57in^3 box? 10.5in^2 per foot. Box is big for the subs so I don't know how relevant in^2/foot number is.
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Old 11-06-2014, 05:08 AM
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What's your tuning frequency? How much power? Just eyeballing it you're probably fine, but there's no way to know until you model it. Answer those for me and I'll see what I get.

The general rule-of-thumb port area/cubic foot suggestions are there because it's kind of a safe range for people who either don't know how or refuse to model it up. Vent air velocity will depend on power, tuning frequency, enclosure size, and the swept volume of the subwoofer(s).
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Old 11-06-2014, 09:55 AM
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Quote:
Originally Posted by SPLEclipse View Post
What's your tuning frequency? How much power? Just eyeballing it you're probably fine, but there's no way to know until you model it. Answer those for me and I'll see what I get.

The general rule-of-thumb port area/cubic foot suggestions are there because it's kind of a safe range for people who either don't know how or refuse to model it up. Vent air velocity will depend on power, tuning frequency, enclosure size, and the swept volume of the subwoofer(s).
31.5Hz and ~2400 watts. I've modeled it in WinISD and the port air velocity peaks at like 30m/s. I used a JL 10W7s as the drivers.
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Old 11-06-2014, 10:56 AM
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I'm getting about the same - around 33m/s at 30hz. Thirty m/s is typically considered the max you want to have, and it would be nice to bring it down a bit, but I don't think you'll have any issues on music even at really loud volumes. See the attached picture for my results.
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File Type: jpg hds10s.jpg (309.8 KB, 22 views)
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Old 01-01-2015, 02:20 PM
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This is just me, but I like to try to keep it around 24-26 m/s. My first ported box I built was showing 28.xx m/s in WinISD, but had just a tad bit of noise around 55hz. You couldn't hear it unless you were right by the box. I rounded the port entrance, and pulled the sub to round the other end the best I could. It fixed the noise issue until I bought a bigger amp. Ever since then I've tried to keep it in the lower mid to 20's. I'd try to make the port a little wider if possible, I think adding 1/8-1/4" more width to the port would drop you in a good range. Shouldn't add too much more length to get to your tuning. If you can afford losing a little, I'd definitely try to squeeze a little more. Hell I'm running 31.5 in^2(18.2 in^2 per cube) for 2 XD8's and half the power you're running. That's just my 2 cents, I'm still learning so I could be wrong.

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Old 01-16-2015, 04:46 PM
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I ending up building the box with 47.5in^2 of port area and I like it.
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Old 05-28-2015, 10:20 PM
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Quote:
Originally Posted by SPLEclipse View Post
I'm getting about the same - around 33m/s at 30hz. Thirty m/s is typically considered the max you want to have, and it would be nice to bring it down a bit, but I don't think you'll have any issues on music even at really loud volumes. See the attached picture for my results.
How did you get more+bigger graphs in bbp6? I can't seem to figure it out.

Sent from my Samsung Galaxy Tab®4 on 38's
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