A Study of DMLs as a Full Range Speaker

[SapphireSloth]

Oh, I selected the magnet block in 2 of those designs so that must not be correct in the middle and right ones. Idk how to model & measure this the right way when the coil is overlapping the magnet. Or maybe that is right, idk. Help?

 

[homeswinghome]

For interest, I recently measured the throw of a Dayton DAEX25FHE-4 exciter at 1.1mm in and 1.4mm out.
A Dayton 3.5" TEBM65C20F BMR driver measured 2.5mm in, 2.9mm out.
So if it could be controlled, and the panel be able to bend sufficiently, the BMR driver should provide more base than the standard exciter...Yet to be tried

Hello Eucy,
Is it the maximum mechanical stroke on each direction or is it under the same amount of current?
Christian

 

[moray james]

a simple but reliable way to know what sort of linear travel is available is to expect about 1/3 of the top plate thickness and that is going to be pretty much the linear peak to peak travel of a speaker motor.

 

[Eucyblues99]

Hello Eucy,
Is it the maximum mechanical stroke on each direction or is it under the same amount of current?
Christian

Christian, they were the "clack to clack" max mechanical strokes under DC battery hookup
Eucy

 

[scrapper4]

I used headphones to listen and it sounds really good. Maybe too good to be true?

 

[Veleric]

What is that you are listening to?

 

[spedge]

That is you favorite mystery person playing some lovely sounds on his dml panels🤣
Steve.

 

[moray james]

Steve you need to make a recording of the Coaster's playing on your coasters.

 

[Eucyblues99]

I have been following this thread for awhile now and I want to build a pair. Is there a consensus on which one sounds the best? If so are there complete instruction plans in detail for me to duplicate so that I can avoid any mistakes.

Hmmmm...DMBLES / Audiofrenzy reawakened?

 

[scrapper4]

sshhh i dont know what you ae talking about.

 

[moray james]

Scrapper4 have you considered investing some time to find a commercial panel which you like? Buy a pair and reverse engineer them and when you are happy with the results of your handy work sell the commercial panels on the used market place. If you get a good deal and you don't take a long time you should not take a big hit when you sell the commercial panels off.

 

[twocents]

That's what he did initially
https://www.diyaudio.com/community/...s-as-a-full-range-speaker.272576/post-5960411

 

[scrapper4]

 

[moray james]

sounds like you ought to be happy with this what ever it is?

 

[Eucyblues99]

sounds like you ought to be happy with this what ever it is?

We'll never know what it is... That's the thing..😵‍💫

 

[moray james]

That's too bad. I think that for every person here who is invested in building a pair of dml there is going to be a different design to meet their idea of what they are looking for. That makes this thread so much more interesting.

 

[spedge]

Steve you need to make a recording of the Coaster's playing on your coasters.

If you are referring to my canembert cheese box panel ?
This wooden panel is 11cm and the thickness is somewhere between .5mm and 1mm ?
Les than 1mm , that is as accurate as my device and eyes can go 😳
If someone has an old two way speaker with a blown tweeter, this could be a good way to have a dml speaker for free, with electronic EQ ,of course.
The XO was about 500hz if I remember correctly.
This was just a bit of fun, but it does work.
Steve.

 

[spedge]

My video on YouTube 🤗🤣

 

[moray james]

Steve I was just getting lunch ready and stood and stared at a butcher pack of hamburger. The tray is one of those large pre moulded white styrene trays about 27.5cm long by 22.5cmm wide and 3.5cm deep at a guess the tray material is approx 3mm thick, this would hold about 1- 1.5kg of ground beef. the bottom of the tray that is flat is about 20cm x 15cm so big enough to make a flat panel say 5.5" x 7.5" close to your 6" x 9" card stock panels. Did you ever try this as a panel material? The whole tray only weighs14 grams all up. Any thoughts? This has a smooth skin, do you figure that would need to be sanded off?

 

[scrapper4]

Those white styrene trays used for meat packing is to soft I wouldnt even bother with it. Even 1lbs density EPS is better then those trays.