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post #1 of 11 Old 01-08-2019, 04:42 AM - Thread Starter
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Rexus and VBSS build * Metric

Hi guys,

Long time lurker, first time builder.

I have a medium sized dedicated room and I'm looking to build DIY subs replacing commercial. Used to have SVS PB-13 ultra, and some lesser SVS models. The SVS's are sold, and Four Dayton PA460-8 are underway from US to Norway. Inspired by VBSS thread and @ddigler s Rexus @LTD02 design.

My preliminary plan is to build two Rexus for far-field placement, and two VBSS for nearfield.
(I've got a Behringer 12" active sub nearfield behind listening position but the amp is blown, but my conclusion is that nearfield is a must, two VBSS will replace defective Behringer)

Amp is Behringer NX3000D.

This project is specced for metric and the panels will be BB 18mm (3/4"?).

I've adjusted the VBSS cabinet a bit to make the cuts fit the 1,8x122x240cm panels.

Please find attached pictures of VBSS and Rexus. I did not round over the corners or port in the model, but will do so with a router when building the enclosure.

I've also given Winisd a try to see how the two models fare against each other, I have no idea if correct so please give the picture a look and guide me onward with Winisd.


How do the models look? Ready for building?

What about Winisd, how do I compare the two at 20hz f.ex? How do I interpret the graphs?

This is my first rodeo so I appreciate all your input guys.

Regards

Frank
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System: Pioneer LX901, Nvidia Shield, Xbox One X
Speakers: 3 x B215XL, 8xB212XL, 1xAlto TS218, (DIY build underway Rexus and VBSS build)
MiniDSP2x4 revB, UMIK-1, Sony HW40ES, Dreamscreen V5 Ultraframe D65 100"

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post #2 of 11 Old 01-08-2019, 06:00 PM
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You have to add a HPF when modeling.
You also have to increase the watts until xmax is reached or PE is exceeded or port velocity is crazy high.

Or if you are feeling lazy, just click the max-spl chart.

For 8 18's you'll have to add 18db. (6db per doubling of cones & watts.)
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post #3 of 11 Old 01-08-2019, 06:53 PM
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Anything less than 30 subs is reasonable


Have you tested your math against the Marty subs? Just for starters, subtract the enclosure material 20" - 3/4 -3/4 on width for an example. Subtract the port volume and driver. It should be getting close and take some volume off for bracing. WinISD tends to over estimate port length 15%. The port orientation with the opening of the port to the side of the cab will add "length" to the port, should be close to the port height the effective length addition. This advise is if you want to start getting a bit crazy with adjusting the box sizes. I think the PA460s will handle 9.6mm on excursion. Anything less than 25m/s should be okay on port velocity. 8 subs will be fun



-John
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post #4 of 11 Old 01-08-2019, 09:18 PM
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Here is 35cuft x8 and 15cuft x8. Both at 0.5kW x8


and the EQ needed to keep the cone motion safe.

Allowing higher excursion might be a slightly higher SPL.
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post #5 of 11 Old 01-09-2019, 06:58 AM
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Quote:
Originally Posted by BassThatHz View Post
Here is 35cuft x8 and 15cuft x8. Both at 0.5kW x8


and the EQ needed to keep the cone motion safe.

Allowing higher excursion might be a slightly higher SPL.

BTH, do you still have the build pictures of your quad opposed PA460 towers? That is something fun to do with 8 PA460 like you have here in your sim

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post #6 of 11 Old 01-09-2019, 10:43 AM
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post #7 of 11 Old 01-09-2019, 02:22 PM
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Quote:
Originally Posted by Red Five View Post
BTH, do you still have the build pictures of your quad opposed PA460 towers? That is something fun to do with 8 PA460 like you have here in your sim


More starting here:

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post #8 of 11 Old 01-09-2019, 07:25 PM
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It's pretty hard to out-do 2x the cone area and 2x the power...



and it fits nicely behind my fronts, ported would certainly not...
16 ported PA-460's would take up half of the breathable air!


Hard to recover from a 90db loss of 3hz...

I'll take all the deebeez's and all the hurtz's I can get my hands on...
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post #9 of 11 Old 01-09-2019, 08:37 PM
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I would totally do it, but explaining why I am purchasing 8 subwoofers vs 1 would go so far over the wife's head, it would be like explaining red to someone who has never had vision for a second of their life. You have to pick which hills to do battle and die on. I will wait for something else It will probably be something stupid like a 128 core CPU on 3nm, you just can't say no to that.



The quad opposed is nice for fitting under a screen and you can see how nicely it extends in the sim
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post #10 of 11 Old 01-11-2019, 05:12 PM
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if you brace the baffle well and add extra pieces for the screws to bite into (or pre-drill and are careful not to strip the threads) a single baffle can work.

this is an example of a similar, not identical cab bracing.





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post #11 of 11 Old 01-14-2019, 10:52 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
if you brace the baffle well and add extra pieces for the screws to bite into (or pre-drill and are careful not to strip the threads) a single baffle can work.

this is an example of a similar, not identical cab bracing.





Still waiting for drivers, hope they're enjoying their Atlantic ocean cruise... They'll certainly be put to work when they arrive here....

Thanks for the tip @LTD02 . I'll add some bracing to the model.

The double baffle is there mainly for flush mounting the driver as I find that aesthetically pleasing The "frame?" of the subwoofer is 10mm, so 12mm plate for second baffle layer might be adequate?
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System: Pioneer LX901, Nvidia Shield, Xbox One X
Speakers: 3 x B215XL, 8xB212XL, 1xAlto TS218, (DIY build underway Rexus and VBSS build)
MiniDSP2x4 revB, UMIK-1, Sony HW40ES, Dreamscreen V5 Ultraframe D65 100"
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