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A Study of DML's as a Full Range Speaker
A Study of DML's as a Full Range Speaker
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Old 24th May 2020, 05:05 PM   #2011
BurntCoil is offline BurntCoil  United Kingdom
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A Study of DML's as a Full Range Speaker
Quote:
Originally Posted by spedge View Post
Burntcoil.
I too have been ordered out into the garden by the boss,every day of the lockdown in fact! And I don't even like gardening!
So I'll have to keep it short,you asked about my ply panels,do you mean my rigid panels? ,it's probably on here somewhere,I could do a recording using the big or small or both ,it's a good way of getting an idea of how they sound without going through the agro of building them first!
Although they are practically full range 40hz to 20k on normal program material ,as with all panels I would keep very heavy low frequencies well away especially if you only have 10watt exciters!
The painter's picture frame isn't a bad full range panel in the same 40hz to20k range for the small size I made(it's basically a small Ply panel suspended on a canvas),I'm not sure how large you could make them before it all falls apart.
If you are not careful you could end up like me with a house full of different panels,just because you can!
Oops must go,I can hear the call of the wild!
Steve
Ah, the call that cannot be denied.

I did not express myself clearly which happens a lot these days. I am interested in the material specification on the ply panel that had a peaked response in the HF so I can try it out. Just the wood type, ply number, grade and the thickness plus any treatment you applied.

Have been striming so share the pain!

Cheers

Burnt
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Old 24th May 2020, 05:09 PM   #2012
TNT is offline TNT  Sweden
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Covid - try "Go Advanced" and attach the pictures and they will be stored on the diyadio server. And, standard is 50 dB top/bot on the y-axis

Nice panels!!!! :-D

Please, som photo details on the hanger solution?

//
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Old 24th May 2020, 05:33 PM   #2013
BurntCoil is offline BurntCoil  United Kingdom
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A Study of DML's as a Full Range Speaker
Quote:
Originally Posted by kaptajnThomsen View Post
Just a thought, would sanding down a ply panel to 2mm or such be a silly idea if you cant source it that thin? I recon you would need a very good quality with all birch cores and need at least 2 layers.

Lathams in the UK stock very thin Finnish Birch Ply.

From their website

Birch Throughout II/III
EN636-2 EN314-2 : PEFC Certified

Size & Thicknesses:

1220 x 1220

0.4mm / 0.8mm / 1.2mm / 1.5mm* / 2mm

* Also available in 1525 x 1525

You should be able to source it locally as Lathams import all their ply from Europe, or 'the Continent" as are now suppose to call it.

Burnt
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Old 24th May 2020, 06:57 PM   #2014
kaptajnThomsen is offline kaptajnThomsen  Denmark
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Thanks Burnt, I now found a source for 2mm, but no details on quality, i'll have to contact them about that or look some more. You were right, that was way easier then sanding it down

Cheers
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Old 25th May 2020, 12:19 AM   #2015
spedge is offline spedge  United Kingdom
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Burntcoil.
This is the only information I have,Wickes basic ply.
To be honest,I would expect most ply wood to have similar frequency responses.
But you could suprise me.
Steve
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Old 25th May 2020, 02:32 AM   #2016
bradleypnw is offline bradleypnw
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Quote:
Originally Posted by kaptajnThomsen View Post
Interesting product: Muzo | Celestial Tribe Official Site
also with a billionsound exciter, in curious about the sticky pad they developed to reposition it, for testing purposes.
Have anyone else heard of this?

edit: apprently they did a kickstarter Muzo - Your Personal Zone Creator with Noise Blocking Tech. by Celestial Tribe Kickstarter where they sold it as a noise canceling device, it seems that idea didn't work out as hoped and now they just sell it as a "sound devide" lol!
Good idea. I hope it works.
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Old 25th May 2020, 11:29 AM   #2017
spedge is offline spedge  United Kingdom
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burntcoil.
this is the 6x2ft rigid panels ,ply on the left ,hardboard on the right.
had to keep the volume down as the panels were only test panels so were not glued solidly together,so kept just below buzzing levels,i hope.
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File Type: mp4 drum framed ply mp4.mp4 (4.34 MB, 23 views)
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Old 25th May 2020, 02:16 PM   #2018
100ohms is offline 100ohms  Switzerland
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Quote:
Originally Posted by 100ohms View Post
two pictures of the corrugated double layered cardboard speaker.
The exciter is now on a poplar ply of 21 x 30 cm x 3 mm and this is glued on the corrugated cb panel. On the poplar some two dozen holes* of 5 mm drilled around the exciter and on the panel upper corners* there are two left overs of round cardboard (from adhesive tape) glued. *This I made +/- upon Spedge's advice. The sound has now more details and clarity but in this criteria is still far away from the honeycomb panel. For me it is quite good balanced and piano or acoustic bass is better balanced and has some body. The usable frequency band looks now not bad.
Measured from 10 inches away (panel / 20' above floor)
Attached Images
File Type: jpg flatpanelspeaker_corrcb_poplar_IMG_5049.jpg (53.2 KB, 221 views)

Last edited by 100ohms; 25th May 2020 at 02:18 PM.
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Old 25th May 2020, 03:25 PM   #2019
100ohms is offline 100ohms  Switzerland
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Quote:
Originally Posted by 100ohms View Post
The exciter is now on a poplar ply of 21 x 30 cm x 3 mm and this is glued on the corrugated cb panel. On the poplar some two dozen holes* of 5 mm drilled around the exciter and on the panel upper corners* there are two left overs of round cardboard (from adhesive tape) glued. *This I made +/- upon Spedge's advice. The sound has now more details and clarity but in this criteria is still far away from the honeycomb panel. For me it is quite good balanced and piano or acoustic bass is better balanced and has some body. The usable frequency band looks now not bad.
Measured from 10 inches away (panel / 20' above floor)
*explanations
probably I'm better to write about my thoughts than leading to a misunderstanding. The feedback of Spedge about some issues of the frequency band measured on my honeycomb panel I've understood, that the issue in high frequency (5.6 kHz) could be solved with a paper (Spedge's technique) and the issue in low frequency could be solved with an AA-battery e.g. at an upper corner of the panel. So I've thought about frequencies, interferences, resonances a.o. To 'decouple' the exciter from interferences and resonances crossing the panel and disturbing the exciter I did the holes in the poplar around the exciter. At the corners I had the same in mind but for simplicity have glued there the round cardboard leftovers. If my thoughts would be right I would not claim. The frequency band on my recent post shows a good result for me.
Eric
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Old 25th May 2020, 11:11 PM   #2020
spedge is offline spedge  United Kingdom
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Default Pic

Burntcoil.
Hi ,the first picture is of the ply panel,the second pic is the 3mm hardboard at about 1m.
The low end goes all the way down to 20hz on both panels ,with the upper peak higher on the hardboard ?
No weights or paper used,just the basic panel.
Might measure the 3x2ft and do a recording ,I can play louder as the panel is glued as well as screwed together solidly.

100ohms.
Can't say I'm not a little confused,it could be the drink I had earlier,you glued a ply panel on the cardboard panel and drilled 5mm holes around the exciter and stuck cardboard rings near the top corners .
It's all part of the learning curve.
Steve
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File Type: jpg IMG_20200525_230242.jpg (670.9 KB, 187 views)
File Type: jpg IMG_20200525_225958.jpg (658.8 KB, 166 views)
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