A Study of DMLs as a Full Range Speaker

Jump to Latest
#8,381
Veleric said:
What damping is included in the panel or perimeter?
Click to expand...
Frost King Weather foam. If you look closely its not one continuous strip of foam around the perimeter but foam cut into smaller strips to leave gaps inbetween so that some sound can pass freely at the edges. This will make it sound a bit more airy. Not saying that you cant use one continuous strip around the whole perimeter its just personal preference. This technique was done by Bertagni.

On the panel its glue/water mixture and paint. The more glue in the mixture and or the more coats of paint will have more damping factors while less is the opposite. The amount of damping used is personal preference.
 
Last edited:
  • Like
Reactions: Veleric
#8,382
Audiofrenzy said:
Frost King Weather foam. If you look closely its not one continuous strip of foam around the perimeter but foam cut into smaller strips to leave gaps inbetween so that some sound can pass freely at the edges. This will make it sound a bit more airy. Not saying that you cant use one continuous strip around the whole perimeter its just personal preference. This technique was done by Bertagni.

On the panel its glue/water mixture and paint. The more glue in the mixture and or the more coats of paint will have more damping factors while less is the opposite. The amount of damping used is personal preference.
Click to expand...
I've used that too (Frost King). You may even have suggested it to me! My only problem with it is that the thickness tends not to be uniform. But as I recall it was pretty good at damping, plus it is inexpensive and readily available.
Eric
 
#8,385
Veleric said:
I noticed that too about the perforations. I don't know exactly what to think of the first picture, where there are no apparent perforations. In fact, it doesn't really even look like end grain balsa. I wonder if that is just a "staged" video clip that didn't use an actual or fully prepared panel for some silly reason. As if they decided they wanted to include a shot of that only after the rest of the video was prepared, and they didn't have any of the right panels handy, so they "faked" it.

There's no reason I can think of that the black spots would be on the fiberglass.

I also don't think the grain direction is different. It's just a bit of balsa thats different in color. Those balsa panels are made of an array of balsa pieces that are perhaps 50mm x75mm glued together on the edges, and not "strips". I don't know for sure, but I suspect they take a bunch of balsa boards that are, say 50mm x75mm x 600mm(?) with the grain running in the long direction. Then they glue them together on the short sides to make a big block and then slice the block into thin panels. That's my best guess anyway.

Eric
Click to expand...
You are guessing right again! 🙂
They surely have faked it. At first I thought the film is printed like that, but the the holes are regular from edge to edge.
If I find a perforated cardboard or something, I'll try that. The film looked like Mylar.
 
#8,387
Audiofrenzy said:
Frost King Weather foam. If you look closely its not one continuous strip of foam around the perimeter but foam cut into smaller strips to leave gaps inbetween so that some sound can pass freely at the edges. This will make it sound a bit more airy. Not saying that you cant use one continuous strip around the whole perimeter its just personal preference. This technique was done by Bertagni.
Click to expand...
Maybe, you'd like to post some pictures? Or, some sketches? What is the panel material?
Audiofrenzy said:
On the panel its glue/water mixture and paint. The more glue in the mixture and or the more coats of paint will have more damping factors while less is the opposite. The amount of damping used is personal preference.
Click to expand...
I'm sure I read these lines, quite sometime ago. 🙂
 
#8,389
Sorry is all that you can say, years gone by and still words dont come easily like sorry like sorry, forgive me is all that you can say years gone by and still words dont come easily like forgive me forgive me BUT you can say baby baby can I hold you tonight, maybe if I told you the right words at the right time you'd be mine. 🤣🤣🤣 Thats me type singing. My voice is not as good as spedge. 🤣

 
Last edited:
#8,391
chdsl said:
Oh, I pay attention what people write or say. You just suggested where to look at those "many many times"... 🙂
I'm going back to read the first 30-40 pages in this thread.
Click to expand...
It was quite sometime ago.😉 Also on many other forums like P.E. Techtalk. At least on P.E. I can speak more freely then this forum and not have to walk on eggshells. 😎
 
Last edited:
#8,396
I’m using an insulation foam from tesa. I’ve tried many different foam and rubber. This is the one that works best.
Im using all around the edge no gaps.

C6EA1BD9-7F81-4B63-A991-008BAACF9332.jpeg
 
#8,398
Audiofrenzy said:
Spedge is not always right but he is the sharpest tool in this shed. 😎

I also know Spedge from the other forum with Ziggy.
Click to expand...
Sure, @spedge is the sharpest here, and he was right! 🙂

Veleric mentioned "I've used that too (Frost King). You may even have suggested it to me!" That reminded me, who was writing about Frost King Weather foam in the early days here.
 
You must log in or register to reply here.
Top Bottom