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Showing results 1 to 25 of 998
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Search: Keyword(s): ; Posts Made By: Bigus
Forum: DIY Speakers and Subs   02-13-2016, 02:12 PM
Replies: 2
Views: 63
Posted By Bigus
I kind of stopped reading about halfway through. ...

I kind of stopped reading about halfway through.

Fully constrained edges are appropriate as modeling a real enclosure where the corner joints are adequately strong and stiff (bending moments are...
Forum: DIY Speakers and Subs   02-13-2016, 07:30 AM
Replies: 3
Views: 75
Posted By Bigus
Submerge it in water and see how much it...

Submerge it in water and see how much it displaces. Well, submerge your friend's at least.
Forum: Audio Theory, Setup, and Chat   02-12-2016, 10:18 PM
Replies: 54
Views: 1,031
Posted By Bigus
Was thinking perhaps it would allow underhung vs...

Was thinking perhaps it would allow underhung vs overhung but freely admit driver design ain't my thing. :)
Forum: DIY Speakers and Subs   02-12-2016, 01:38 PM
Replies: 88
Views: 3,956
Posted By Bigus
FriscoDTM, I really like the...

FriscoDTM,

I really like the modushop/HiFi2000 cases, especially the multihole bottom plates. I'm considering it for multichannel amp builds of my own. Did you order directly from Italy? How...
Forum: DIY Speakers and Subs   02-12-2016, 01:12 PM
Replies: 135
Views: 2,204
Posted By Bigus
I sort of mixed more than one concept together...

I sort of mixed more than one concept together there and wasn't very clear about it, so let me separate them.

It can be difficult to move the resonant frequency of an enclosure wall above the...
Forum: DIY Speakers and Subs   02-12-2016, 10:23 AM
Replies: 135
Views: 2,204
Posted By Bigus
Solid (volumetric) elements are the wrong...

Solid (volumetric) elements are the wrong approach for this sort of problem. A combination of plate elements and beam elements are perfectly adequate and will actually allow for a greater degree of...
Forum: DIY Speakers and Subs   02-12-2016, 08:26 AM
Replies: 135
Views: 2,204
Posted By Bigus
Yes, that's exactly right. The panel vibrates...

Yes, that's exactly right. The panel vibrates very much like a guitar string. Bracing a panel is just like putting a finger on a fret, shortening the vibrating length of the string.

The only...
Forum: DIY Speakers and Subs   02-11-2016, 10:02 PM
Replies: 135
Views: 2,204
Posted By Bigus
Adding mass to the panel. Stiffening the...

Adding mass to the panel.

Stiffening the panel drives resonance frequency up, and decreases amplitude of forced vibration even at resonance. Driving resonance above the passband is a pretty good...
Forum: DIY Speakers and Subs   02-11-2016, 08:51 PM
Replies: 135
Views: 2,204
Posted By Bigus
I've used autodesk products for about two...

I've used autodesk products for about two decades, but to be honest I've never played with fusion 360. I did a career uturn about a decade ago, and use their drafting and solid modeling tools now...
Forum: DIY Speakers and Subs   02-11-2016, 03:27 PM
Replies: 135
Views: 2,204
Posted By Bigus
OK, I got bored for a minute and did the simple...

OK, I got bored for a minute and did the simple case comparison of a rectangle cross section used in its stiffest direction as a panel beam stiffener vs stanchion, ends fully constrained (true only...
Forum: DIY Speakers and Subs   02-11-2016, 02:26 PM
Replies: 135
Views: 2,204
Posted By Bigus
:)

:)
Forum: DIY Speakers and Subs   02-11-2016, 02:26 PM
Replies: 135
Views: 2,204
Posted By Bigus
Yeah that's it. "Hard work" is an interesting...

Yeah that's it. "Hard work" is an interesting way to put it... working for the DoD/Navy was eye opening. I personally produced about 5 iterations of that topside structure design, scrapping it each...
Forum: DIY Speakers and Subs   02-11-2016, 02:23 PM
Replies: 135
Views: 2,204
Posted By Bigus
Well, yes and no. The equation for stiffness of...

Well, yes and no. The equation for stiffness of a beam of a certain cross section is straightforward, and could certainly be put in excel form if not already done and floating on the web. And the...
Forum: Audio Theory, Setup, and Chat   02-10-2016, 07:32 PM
Replies: 54
Views: 1,031
Posted By Bigus
Hey, I had a free lunch today! Well... the...

Hey, I had a free lunch today! Well... the department paid for it, but free for me is good enough and all that really matters anyway. :)
Forum: Audio Theory, Setup, and Chat   02-10-2016, 07:28 PM
Replies: 16
Views: 308
Posted By Bigus
Depending on how high your subs are crossed, and...

Depending on how high your subs are crossed, and what the response from your mains looks like, I might consider targeting that 125Hz null.
Forum: Dedicated Theater Design & Construction   02-10-2016, 01:50 PM
Replies: 29
Views: 373
Posted By Bigus
Well, aesthetic considerations always come in to...

Well, aesthetic considerations always come in to play and it is up to each of us to prioritize where in importance those considerations fall for us. To be blunt, just looking at the design of your...
Forum: DIY Speakers and Subs   02-10-2016, 01:29 PM
Replies: 135
Views: 2,204
Posted By Bigus
All of those applications mentioned have one very...

All of those applications mentioned have one very important thing in common - they require large open spaces where no bracing is allowed to penetrate. You can't have 2x4'x criss-crossing the rooms...
Forum: Dedicated Theater Design & Construction   02-09-2016, 07:58 PM
Replies: 29
Views: 373
Posted By Bigus
It isn't something you would really "notice" in a...

It isn't something you would really "notice" in a straightforward way, but there has been research to this effect. I'm sure in some cases the effect is neglible, and as above in some extreme cases...
Forum: Dedicated Theater Design & Construction   02-09-2016, 07:56 PM
Replies: 29
Views: 373
Posted By Bigus
Surprisingly the brain will pull the image down...

Surprisingly the brain will pull the image down quite easily to match the perceived L and R height. But there are of course extreme cases, especially when using a big 16 x 9 screen, or a very high...
Forum: DIY Speakers and Subs   02-09-2016, 07:50 PM
Replies: 135
Views: 2,204
Posted By Bigus
That makes no sense. Based on your suggested...

That makes no sense. Based on your suggested bracing scheme, and explanations of it, I cannot help but conclude you simply have no idea what your talking about.
Forum: Dedicated Theater Design & Construction   02-09-2016, 01:41 PM
Replies: 29
Views: 373
Posted By Bigus
Single speaker above. Placing two, one...

Single speaker above.

Placing two, one above and one below, will cause serious lobing artifacts in the vertical plane.

Placing one below, while OK, is much easier to localize (if you're an...
Forum: Audio Theory, Setup, and Chat   02-09-2016, 01:19 PM
Replies: 16
Views: 308
Posted By Bigus
If you had a known problem mode of narrow...

If you had a known problem mode of narrow bandwidth, you could attempt to turn it into a pressure/resonant/membrane absorber. Perhaps using pegboard covered in fabric. Would have to identify a...
Forum: DIY Speakers and Subs   02-08-2016, 02:29 PM
Replies: 135
Views: 2,204
Posted By Bigus
http://i.imgur.com/tClPplll.png This is a...

http://i.imgur.com/tClPplll.png

This is a very inefficient, expensive, complicated, and not particularly effective way to brace speaker enclosure panels. Glass fiber in this application is a...
Forum: DIY Speakers and Subs   02-07-2016, 08:27 AM
Replies: 135
Views: 2,204
Posted By Bigus
Strength isn't required in a speaker panel. The...

Strength isn't required in a speaker panel. The forces are quite small. Stiffness, mass, and damping are needed, probably in that order. MDF is particularly good when it comes to mass and damping....
Forum: DIY Speakers and Subs   02-05-2016, 11:17 PM
Replies: 40
Views: 1,080
Posted By Bigus
Your idea will work. The suggestion made in this...

Your idea will work. The suggestion made in this thread is better. Noise isn't really the problem. Well, at least its only part of the problem. Its best to think about this in terms of distortion....
Showing results 1 to 25 of 998

 
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