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post #61 of 82 Old 05-29-2019, 10:01 AM
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WinISD spits the vent data out after you tell it what you want for a tune with a net internal volume. You can adjust the size of the ports, but that will not effect the tune at all. You should be able to work around that, change the number of ports to 1 from 2. Then keep lowering the tune on the box until the vent length matches the original calculated length.



My Stormbreaker as an example, 18Hz tune 11 cuft, 3 vents, 9"x2.5", port calculated at 46.91". I went down to 2 vents, then went into the box tab, changed the tune to 14.7Hz vent length is calculate at 46.89" or about the same as before. That is where my box would end up tuned roughly going down a port. I did not get that number on the first try

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #62 of 82 Old 05-29-2019, 10:15 AM - Thread Starter
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Quote:
Originally Posted by Jedi940 View Post
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Originally Posted by KevinMRoach View Post
I just need some help nailing down the vent calculations.

If I take the original VBSS design, I should theoretically should be able to keep the vent sizes the same, as long as I’m close to the same Internal Volume. Where I’m a bit confused is within WinISD how do I model “plugging” one of the ports to get 15HZ?
You would need to change the number of ports to 1 and the tuning to 15. The port length should be about the same with those changes. Also remember that port length is calculated down the middle of the port.

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Understood, so I tried that out. I’m fairly sure I’m close on this. In WinISD when I simulate “plugging” a port, it wants the port length to be shorter for the 15 HZ option, but not by much. I do think my design needs to be a bit wider, to get closer to the original size
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post #63 of 82 Old 05-29-2019, 10:19 AM - Thread Starter
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Originally Posted by Red Five View Post
WinISD spits the vent data out after you tell it what you want for a tune with a net internal volume. You can adjust the size of the ports, but that will not effect the tune at all. You should be able to work around that, change the number of ports to 1 from 2. Then keep lowering the tune on the box until the vent length matches the original calculated length.



My Stormbreaker as an example, 18Hz tune 11 cuft, 3 vents, 9"x2.5", port calculated at 46.91". I went down to 2 vents, then went into the box tab, changed the tune to 14.7Hz vent length is calculate at 46.89" or about the same as before. That is where my box would end up tuned roughly going down a port. I did not get that number on the first try [IMG class=inlineimg]/forum/images/smilies/wink.gif[/IMG]
That helps a lot, thanks!
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post #64 of 82 Old 05-29-2019, 10:51 AM
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One other quick WinISD note, WinISD calculates slot ports to be longer than actual. Roughly 85% of the given calculated length should be used when the saw dust flies

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #65 of 82 Old 05-29-2019, 12:29 PM - Thread Starter
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One other quick WinISD note, WinISD calculates slot ports to be longer than actual. Roughly 85% of the given calculated length should be used when the saw dust flies [IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG]
That also helps a lot. I have still a ton to learn.
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post #66 of 82 Old 05-30-2019, 08:35 PM - Thread Starter
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One other quick WinISD note, WinISD calculates slot ports to be longer than actual. Roughly 85% of the given calculated length should be used when the saw dust flies [IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG]
That also helps a lot. I have still a ton to learn.
Took this into consideration for hopefully my final drawing. I did about 85-90% of what WinISD told me
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post #67 of 82 Old 05-31-2019, 07:03 AM
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Took this into consideration for hopefully my final drawing. I did about 85-90% of what WinISD told me

The sketch is looking good! It is simple math to calculate the internal volume. Take out: wall thickness, port volume, bracing and then the driver, figure about .2-.25ft3 for the sub. Once that is done come up with a cut list and make the saw dust fly

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #68 of 82 Old 06-03-2019, 07:37 PM - Thread Starter
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The sketch is looking good! It is simple math to calculate the internal volume. Take out: wall thickness, port volume, bracing and then the driver, figure about .2-.25ft3 for the sub. Once that is done come up with a cut list and make the saw dust fly
Annnnnnnnnd I still have more questions, sorry! Thanks for all the tips

1. The NU1000dsp is 300$ CAD on Amazon, but the NX3000D is 470$ CAD. Is the NU1000 sufficient for two 15hz VBSS in a 12x12x8 Room? I've been reading for quite awhile and I'm having trouble finding enough information to settle my indecisiveness. Also I do enjoy discrete sub volume adjustment with my x4400h, something I understand the NU1000 wouldn't be capable of.

2. I'm making some cuts tomorrow, here is my "Final" design. Port length is very close to original, only slightly shorter. Tuning is just over 15hz
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post #69 of 82 Old 06-04-2019, 08:21 AM
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Consider going with the 3000. For a little more than 50% increase in price you get 3x the amount of power. Plans change, having more power available is not a bad thing. You might find a way to double the number of cones later on, so having the wiggle room means one less thing you need to purchase.


What is the calculated net internal volume? I can check the numbers quick

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #70 of 82 Old 06-04-2019, 09:14 AM - Thread Starter
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Originally Posted by Red Five View Post
Consider going with the 3000. For a little more than 50% increase in price you get 3x the amount of power. Plans change, having more power available is not a bad thing. You might find a way to double the number of cones later on, so having the wiggle room means one less thing you need to purchase.


What is the calculated net internal volume? I can check the numbers quick [IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG]
Yeah good call. I’m going to sell a KEF cube I have, that should cover the difference between the 1000 and 3000.

Thanks! Net Volume came to about 6.3-6.5 depending on how much batting/bracing I do
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post #71 of 82 Old 06-04-2019, 09:34 AM
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Assuming 6.3 cuft the tune will come in around 15 - 16Hz, it looks good!



Nice SketchUp skills by the way! Did you just pick it up?

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #72 of 82 Old 06-04-2019, 10:22 AM - Thread Starter
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Assuming 6.3 cuft the tune will come in around 15 - 16Hz, it looks good!



Nice SketchUp skills by the way! Did you just pick it up?
Great, thanks for checking!

Yeah this is my first project using it, it’s pretty fun! Tons of stuff you can do!
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post #73 of 82 Old 06-04-2019, 10:35 AM
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Great, thanks for checking!

Yeah this is my first project using it, it’s pretty fun! Tons of stuff you can do!
Slightly off topic, but are you using the free version of Sketchup? I've been thinking of learning it myself. I'm not sure if the free version does what we need (speaker boxes) or you need the pay version. Seems like the freee one does everything but you need to be online to use it (not a biggie).
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post #74 of 82 Old 06-04-2019, 10:41 AM - Thread Starter
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Great, thanks for checking!

Yeah this is my first project using it, it’s pretty fun! Tons of stuff you can do!
Slightly off topic, but are you using the free version of Sketchup? I've been thinking of learning it myself. I'm not sure if the free version does what we need (speaker boxes) or you need the pay version. Seems like the freee one does everything but you need to be online to use it (not a biggie).
So far I’ve only used the free online browser version, it suits my needs so far.
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post #75 of 82 Old 06-04-2019, 11:14 AM
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What resources did you use for learning it so quickly? I dabbled and gave up, I have to go back to it again...

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #76 of 82 Old 06-04-2019, 12:23 PM - Thread Starter
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What resources did you use for learning it so quickly? I dabbled and gave up, I have to go back to it again...
None really, but I did watch a short YouTube video showing the best way to use the “Pull/Push” tool which saved me a ton of time.

I found it very easy to simply use the tape measure tool, type the length or width you want and hit enter. Then just trace out the panel with the rectangle tool along the guide lines created by the tape measure tool, click with the Pull/Push tool and type .75 and hit enter. Boom, a 3/4 panel!

Oh also, layers help a lot. Create a layer for each panel. After you make a panel, select the entire panel and choose “create group”. This allows you to avoid accidentally messing up the panel when you work on other stuff, and easily hide/show parts of the speaker box.
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post #77 of 82 Old 06-05-2019, 10:31 AM
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Would you by chance be interested in doing one mock up of Devastator LFE next to generic man? John did a recent clean up of his files and the Devastator model was lost.

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen

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post #78 of 82 Old 06-07-2019, 07:46 PM - Thread Starter
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Would you by chance be interested in doing one mock up of Devastator LFE next to generic man? [IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG] John did a recent clean up of his files and the Devastator model was lost.
Yeah absolutely! I can try anyways. I’m 6 hours into my modded VBSS assembly and I already regret some of my design choices haha.
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post #79 of 82 Old 06-08-2019, 06:09 AM
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Thanks! Only a couple changes 42" deep instead of 30". Lower port goes up to 3" instead of two. Top opening stays at 10 inches.

What would you change on the design if you did a take two?

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #80 of 82 Old 06-08-2019, 06:27 AM - Thread Starter
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Thanks! Only a couple changes 42" deep instead of 30". Lower port goes up to 3" instead of two. Top opening stays at 10 inches.

What would you change on the design if you did a take two?
Sure give a few days, once I get a chance I’ll work on it

For my modded VBSS design I’d mostly just change the way I constructed the ports. I ended up needing way more clamps, and it wasn’t structurally as strong as it could of been. Visually in the end I think I’ll love it!
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post #81 of 82 Old 06-08-2019, 06:40 AM
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Going for symmetry can have drawbacks, like extra work during assembly. With the limited excursion on the PA460 structural integrity of the enclosure does not require the same measures if you were building for an HS24...

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #82 of 82 Old 06-24-2019, 07:57 AM - Thread Starter
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So here we go, finally finished. I ended up priming quite a few times to help cover up the mistakes on my cabinets, and finished with 3 coats of Benjamin Moore Advance. I had them mix a pure black color, but it still ended up a bit Grey which is normal for matte finishes. I still might give it a coat of polyurethane but I'm pretty happy with how they turned out.

As for sound, I only had 10 min to play around with them last night, hopefully i'll get a chance to tweak tonight or tomorrow. I can tell already they will shake the room pretty good!! I have a few questions however

1. What all can/should I adjust on the NX3000 settings? I used the profile mtg provided in the VBSS thread. I assume though I should tweak it to my room/setup.
2. I have it running in Dual, so I can adjust the levels independently. Should I have the gain knobs set high because of the decreased output?
3. Break in period for these drivers?
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