Yes! For people who are auditory/visual learners, video is education of the future (now)
Donate to Brandon!
Donate to Brandon!
I appreciate you tktran303!
I really like the world of video conferencing for the masses. Maybe from now on if someone has questions about material I present, I should ask them to get on Zoom and discuss it. It's so much more effective and time efficient to talk directly to someone. And you can record it and post it for the others to watch and come to their own conclusions.
I really like the world of video conferencing for the masses. Maybe from now on if someone has questions about material I present, I should ask them to get on Zoom and discuss it. It's so much more effective and time efficient to talk directly to someone. And you can record it and post it for the others to watch and come to their own conclusions.
Check their panel products out:
https://www.ramec.it/prodotti/multilight-panel-pannello-sandwich-okoume-sughero-biondo/
https://www.ramec.it/prodotti/multilight-panel-pannello-sandwich-okoume-sughero-biondo/
Brandon- have you heard of Khan Academy? Or Brilliant.org?
It's a new world out there for kids... or kids at heart- it's not too late for us old fogeys.
It's a new world out there for kids... or kids at heart- it's not too late for us old fogeys.
I'm not sure. I'd imagine a supplier here would/could bring some in if they haven't already. So far I've only seen the one Italian co. making these ... another is making t/g flooring. Don't know if any domestic companies have tried this ... yet. They have a contact on their site if somebody was interested in checking availability in the USA. I've always meant to try this myself at some point with 1/4" cork sheet but something always comes along to distract me. I really think something like this would just be ideal for loudspeaker casework.
I suppose I should do a video series that condenses my findings now that I've started a youtube channel. I know the thread here and even my webpage is a long slog, but then it was a long slog to do all those tests!
Anyone use Bandicam or Screencast-O-Matic? Looking for a recorder than can toggle between the screen and webcam, or PIP, and has annotation tools.
Anyone use Bandicam or Screencast-O-Matic? Looking for a recorder than can toggle between the screen and webcam, or PIP, and has annotation tools.
I don't know if you are still actively considering other strategies to test or not. This CLD bracing offers quite good reduction in the problematic middle region. One thing I wonder would be to combine this with panel stiffening ribs to divide the larger sub panels into smaller less regular sub panels. I have a feeling that for very little material it could help improve this region further.
I want to get back to the bracing and test more options. I never did a window brace for example. I guess you could combine it with ribs, although I kind of feel like you should pick a goal: are you trying for max stiffness, or trying to damp? So either ribs and solid braces for stiffness, or CLD braces doing all the work. Now how the braces attach to the panel I think is something I need to understand. Below is a pic of the box from the post you quoted. Here I went with T-shape braces so there would be good surface area contact with the panel, in my mind to best transmit that panel energy into the CLD. Of course it kind of looks like a rib, so that would go along with what you are saying. Also, I glued the braces to the panel with wood glue, again sort of thinking a rigid connection at the panel to better transmit the energy to the CLD layer working in shear as Dr. Geddes has suggested.
That thinking would make more sense to me if the cabinet was to cover a specific range only, stiffen it for a sub, damp it for a mid.
Your test cabinet and most actual cabinets have drivers that cover the whole range and I think some sort of compromise between stiffness and damping is likely a better way to go.
By using the ribs on the tall side panels you would split the main panel into smaller sub panels and this raises the natural resonant frequency making it easier to absorb or damp.
This is like a plate or beam structurally, if you brace it or pin it in more places there will be less deflection, for every brace past the first one the effect gets less and less so even a few can make quite a difference.
Use limited material but in the most useful way. Window braces work and are easy to make, but they are inefficient because the box is already pinned at the corners. I think using stiffer material for the braces or ribs is worth testing. An interesting counter to the things you have already tested, the mdf already has more damping and mass what happens when you add some stiffness to it through the ribs. Earl's braces are oak with CLD, so both stiff and damped.
I think this is a reasonable to go, I can imagine if there are a few ribs either side rigidly attached to split the panel up you could join them across with a CLD adhesive like you did already.
Given that the thicker mdf is on the outside you could put the ribs on the outside for that specific test configuration if it was easier.
While a design like the above has a shear layer and is an excellent transmission block, it's not going to be great for reducing the panel modes.
Really you need to "float" a heavy panel (like large thick saltillo tile or maybe 1/4 steel plate, or perhaps several layers of glued-together sheet-rock might work well) on a *thin(er) panel that's more easily damped - THAT will help substantively lower the panel's vibration. (..same sort of very thin **visco layer though between the two, but the tile/plate shouldn't be connected to anything but the visco layer so that it can move.)
*1/4-3/8 inch thick.
**though I'm not sure that the adhesive is compliant enough.
Really you need to "float" a heavy panel (like large thick saltillo tile or maybe 1/4 steel plate, or perhaps several layers of glued-together sheet-rock might work well) on a *thin(er) panel that's more easily damped - THAT will help substantively lower the panel's vibration. (..same sort of very thin **visco layer though between the two, but the tile/plate shouldn't be connected to anything but the visco layer so that it can move.)
*1/4-3/8 inch thick.
**though I'm not sure that the adhesive is compliant enough.
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I always post comparisons with controls, like a standard brace, or just an empty box. You could look those over and show me what you are referring to.
I tested Hardie backerboard (1/4") glued to the inside of 1/4" MDF shell with the Weicon 310M Flex. It performs real well.
I try to look back over your site/study again tomorrow.
Just one layer of Hardie isn't enough IMO (weight)- plus it's not that rigid.
Oh, with respect to youtubes - thought this one was interesting (..and I remember that yours is more complete, still - interesting to see other's doing this sort of testing even if rather limited by comparision):
Just one layer of Hardie isn't enough IMO (weight)- plus it's not that rigid.
Oh, with respect to youtubes - thought this one was interesting (..and I remember that yours is more complete, still - interesting to see other's doing this sort of testing even if rather limited by comparision):
Take a look at https://obsproject.com/
OBS can do anything you wrote and a million more. It has thousands of tutorials available and any kid who is into Twitch can help you out. Hell, I'll help you out if that means getting your blog into summarized form sooner. 😀
I did look at OBS, no annotation/drawing without using third party software. Too bad, I liked everything else about it.
I tried Bandicam and Screencast-O-Matic last night. Liked everything about Bandicam except I could not toggle the webcam PIP from fullscreen to minimized, to off. Screencast-O-Matic allowed me to do this, but the picture quality isn't quite as good. But may be good enough.
I tried Bandicam and Screencast-O-Matic last night. Liked everything about Bandicam except I could not toggle the webcam PIP from fullscreen to minimized, to off. Screencast-O-Matic allowed me to do this, but the picture quality isn't quite as good. But may be good enough.
Oh great, I'm on YouTube one day and you're already getting me into fights with other YTers! LOL
My days of internet fights are long behind me (believe it or not), so I'll just keep this simple. IMHO, there are obvious confounders in his method that leads him to a conclusion that I think few here would support. He also did a video on whether diffraction matters, and a similar issue with method again led to conclusions that not only would not be agreed to by anyone on this forum, but is also not supported by testing from the likes of Toole.
Hi, As anyone triex chbord and OSB as a part of the internal side of a CLD ?
About video blah : it is not so democratic. It assumes ypu have almost natives educated ears in the language in the video VS the academic reading which is imo more easy for most and also something of a more intelectual thing vs all entertainment. Both should exist and damnq it is a green world now where you want ligther content.
About video blah : it is not so democratic. It assumes ypu have almost natives educated ears in the language in the video VS the academic reading which is imo more easy for most and also something of a more intelectual thing vs all entertainment. Both should exist and damnq it is a green world now where you want ligther content.