Home Theater Upgrade Vlog pt 12
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Uploader Comments (theblackhand2)
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where can i get the woofer kit ?¸
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I dont mean to sound thick, but why would you put dampening foam inside the box? I know from car audio you would put pollyfill in a box to slow the sound wave down (simulating a larger enclosure)...but you have 15 in a 6^3 ft box with 2 4" ports...Just curious, thats all.
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OMG !! huge
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Yes I like your handy work on Goliath.
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@theblackhand2 length isnt the onty thing, port surface area counts also so if its wider that counts
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aaaAAAAaaah I see! Good to know indeed. ^_^
By the looks your system is gonna sound badass by the way. When it's done I hope you put on some nice heavy music and let us all hear it!
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The volume of the enclosure, the desired tuning frequency, as well as the diameter and amount of ports is all that should matter when calculating this.
In the event that your speaker shop got it wrong, it's nothing catastrophic. You would have a 1.5dB peak around 30Hz and lose maybe 1-1.5Hz of low extension. A F3 of 21.5Hz is still very respectable! :)
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That is one heck of a subwoofer.
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What did you use to calculate the length for your ports? In your previous videos you said that the enclosure is 6.5 cu.ft. and will be tuned to 19Hz. According to my program and online calculators your ports should each be around 25.5" long. Didn't you say that they are only 17" long? That would bring the tuning up to around 23.3Hz. :S
falkon212 2 years ago
I had the the speaker supply shop calculate the box with the desired frequency and he came up with the 17' port length. So that is weird.
theblackhand2 2 years ago
I think the wood (hard versus soft) you are using makes a difference too. Of course i could be missing a detail in previous videos but I do imagine it would make a difference in the calculations.
Spiritrunner6 2 years ago
The preferred material for use in building speaker enclosures consists of a dense evenly distributed matrix. 3/4" MDF or a 3/4" furniture grade plywood with many layers such as Baltic birch are good choices. I prefer MDF because its easy to cut and mill, very dense, and acoustically dead reducing unwanted box resonances (that canny sound from cheap Walmart speakers). The calculations come in when setting the optimal enclosure volume and determining the length and diameter of the ports.
theblackhand2 2 years ago