A Study of DML's as a Full Range Speaker - Page 26 - diyAudio
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Old 1st August 2016, 03:18 PM   #251
jreb14 is offline jreb14  United States
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I built two different DML one with 11"x 17" gator board and one with 1/4" 24"x48" underpayment plywood. I used the DAEX25VT-4 with both. I can say that the sound is lacking bass in missing something. It sounds like an unmounted car speaker in many ways. It is not full and playing all 4 sounds better just not full.
I do not think it is all missing bass. It is definitively efficient with not much power needed to drive them.

How long does it take to break in? How much difference does rounding corner make? Is there an exciter that sounds better? Whats the best way to attach speakers wires to the exciter?
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Old 29th September 2016, 01:45 PM   #252
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Just discovered and slowly reading through these DML threads.. jeez!
Questions
Is the Dayton Ultra still the 'top cat' exciter?
Has anyone tried G-EPS ? Stiffer and a nice grey colour
Would two small panels (10 x 7 inches ea) make a good midrange? Wd use with tweet and bass unit
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Old 29th September 2016, 02:25 PM   #253
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Bill poster View Post
Just discovered and slowly reading through these DML threads.. jeez!
Questions
Is the Dayton Ultra still the 'top cat' exciter?
Has anyone tried G-EPS ? Stiffer and a nice grey colour
Would two small panels (10 x 7 inches ea) make a good midrange? Wd use with tweet and bass unit
I am not expert on different DML drivers as I have only tried one, and made my own from an old woofer with perforated cone and contacted to foam core panel via hard mount.

It's fun and cheap to try different panels and different drivers though.
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Old 29th September 2016, 02:45 PM   #254
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The other question is how to attach to avoid the supposed veiled or distant imaging. I'd imagine you want fairly thin panels with a degree of damping around the exciter
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Old 29th September 2016, 03:01 PM   #255
Jerms is offline Jerms  United Kingdom
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Quote:
Originally Posted by Bill poster View Post
Just discovered and slowly reading through these DML threads.. jeez!
Questions
Is the Dayton Ultra still the 'top cat' exciter?
Has anyone tried G-EPS ? Stiffer and a nice grey colour
Would two small panels (10 x 7 inches ea) make a good midrange? Wd use with tweet and bass unit
It has been attempted.
https://www.youtube.com/watch?v=D6hGmyNImaI

Some other links.
Hanging Glass Speakers
Glass Speakers
https://www.youtube.com/results?sear...ml+loudspeaker

I had some idea a while ago to build a TIE fighter and make the "foils" the DMLs. The idea all sort of fell apart when I started concentrating on more "usual" speaker designs. Having done some more reading on DMLs now, I'm not too convinced that my original idea would work all that well.

Now you bring it up tweeters though, I guess a flush mounted dome tweeter in the middle of the panel would work

J.
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Old 29th September 2016, 06:28 PM   #256
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Now you bring it up tweeters though, I guess a flush mounted dome tweeter in the middle of the panel would work

J.
Basically what I had in mind when writing this an oval-ish shape with a horizontal split and the tweet along the split.
Now starting to think making a long thin panel with the tweeter above wd also be nice.
The beauty of DML speakers are the cabinet design possibilities, if you are prepared to get creative with panel materials and shapes
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Old 1st January 2017, 04:59 PM   #257
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After having my interest in DMLs rekindled on another thread, I began to wonder if we know much about the frequency response of these panels at the extreme ends of the spectrum, which I define as below 100 Hz and above 10,000 Hz. Some have noted that larger panels give better bass response, but I have not encountered any generalizations in regard to high frequencies. Can anyone point me to references which show the measurements of DML panels? Some manufacturers claim extended highs but don't list the tolerance for their ratings so I don't know how much credence to give to their claims.

If I were to build a DML panel I would need to use it against a wall due to space restrictions. Should some kind of acoustic damping material be placed behind the speaker to limit that back-panel energy? And, is it best to terminate the edges of a DML in a stiff frame to limit the motion of those edges as well as provide mounting for the panel?

Thanks to all who can help me with these questions.
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Old 1st January 2017, 05:22 PM   #258
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Just wonderful to see xrk971's experiments with 1/12 smoothing and harmonic distortion data. Great.

With all the "disruptive" talk - even advocacy - of resonances by DML advocates, I'm wondering about about something we never wonder too much about with cones on this website. That is, in looking at smoothed frequency traces, can we separate the Rocky Mountain profile of the room from the sheet? How much is the sheet ringing in multiple frequencies and is the FR actually hiding that racket?

I also had my curiosity stimulated by another recent thread. But we are talking about exciters that would be considered plain junk by those in the sub forum who favour $300 drivers with shorting rings and giant magnets, etc. And these are paired to sheets of stuff which - in other settings - would be considered deplorable acoustic properties.

That's not to complain about experimenting with these elements. More is better. Just wondering what happens when you want to DIY-build a high quality device resembling the $100,000 loudspeakers from Goebel?

Ben
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Old 1st January 2017, 09:52 PM   #259
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Originally Posted by bentoronto View Post
Just wonderful to see xrk971's experiments with 1/12 smoothing and harmonic distortion data. Great.

With all the "disruptive" talk - even advocacy - of resonances by DML advocates, I'm wondering about about something we never wonder too much about with cones on this website. That is, in looking at smoothed frequency traces, can we separate the Rocky Mountain profile of the room from the sheet? How much is the sheet ringing in multiple frequencies and is the FR actually hiding that racket?

I also had my curiosity stimulated by another recent thread. But we are talking about exciters that would be considered plain junk by those in the sub forum who favour $300 drivers with shorting rings and giant magnets, etc. And these are paired to sheets of stuff which - in other settings - would be considered deplorable acoustic properties.

That's not to complain about experimenting with these elements. More is better. Just wondering what happens when you want to DIY-build a high quality device resembling the $100,000 loudspeakers from Goebel?

Ben
Ben the resonance of the panel is the point. It is not a racket. You need to find and read the NXT patents to appreciate what is happening here. Also consider that there are similar operational conditions in play in a full range driver. Pistonic behavior is possible only over a limited range in conventional cone drivers.

Sent from my x600 using Tapatalk
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Old 2nd January 2017, 12:52 AM   #260
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You need to find and read the NXT patents to appreciate what is happening here.
Yes of course. Thank you.

But it would be a nice gesture for someone to take a minute to summarize this in two sentences for all of us who have spent lifetimes thinking resonances are great in violins but undesirable in speaker reproduction.

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