DIY Flat Panel Speaker Love

[Unbiasedsound]

Can anyone tell me what he did wrong with his DML panels?>Dayton Speaker Project - Part 2 - YouTube

Hint. DML's are Bipolar/omni open baffle type that radiate sound almost equally from the front and back (sides also depending on ones design). DML's should be placed at least one foot away from the back walls for optimal sound as this is part of the DML's signature (magic) sound.

[Unbiasedsound]

The sound radiating from the front and back are almost equal making them bipolar. If they were more out of phase then dipole.

[AEIOU]

I don't see how they are bipoles, unless there are two opposing drivers one on the front and one on the back. A single driver or single diaphragm, the rear wave is out of phase 180 degrees with the front wave. Equal front and back output has nothing to do with phase, it is phase that makes it a bipole or dipole. Either the back radiation is in phase or is out of phase. But whatever.

[Unbiasedsound]

DML's are in phase so they are Bipolar. Again if they were out of phase then dipole.

[DeZZar]

one of my audiophile buddy ... he told me if you think that is expensive there are certain caps that can cost $100.00 and over per cap

Aww....cute...
https://www.hificollective.co.uk/cat...er-p-4514.html

And that's in great British pounds....

[Unbiasedsound]

OH MY GOODNESS. lol

[peterv]

Using a Dayton DAEX 25FHE -4 exciter speaker on Foamular XPS panel ( 1" x 2' x2' ) . To block the frequency below 100hz would i use a 100uf capacitor ?

[AEIOU]

Using a Dayton DAEX 25FHE -4 exciter speaker on Foamular XPS panel ( 1" x 2' x2' ) . To block the frequency below 100hz would i use a 100uf capacitor ?

A single high pass capacitor, wouldn't provide a very steep cutoff, only -6dB per octave. Depending on the exact impedance of the driver and a few other factors if that exciter is 4Ohms, then it would be 300uf or even 350uf.

[Unbiasedsound]

A single driver or single diaphragm, the rear wave is out of phase 180 degrees with the front wave

This is one of the reasons why DML's are different then conventional "cone", drivers.

[Unbiasedsound]

Using a Dayton DAEX 25FHE -4 exciter speaker on Foamular XPS panel ( 1" x 2' x2' ) . To block the frequency below 100hz would i use a 100uf capacitor ?

4 ohm=400uf cap at 99.38 hertz. The only cap at P.E. at 400uf is NPE caps. They are cheap but they can degrade the sound of the exciter....The Dayton caps is better but they only have a 100 uf cap which is very expensive compared to the NPE caps. The caps alone could cost more then your whole DML build.

[Unbiasedsound]

I am going to experiment with Shelly Katz "Layered Sound", technique of combining a conventional cone driver with a DML panel. I just placed an order for a pair of Visaton WS-17E 6.5" woofers.

The challenge is to get the correct configurations of a dml and conventional cone driver to blend together perfectly as Katz does not explain exactly how to do it.

[Unbiasedsound]

My design will be similar to the Cambridge audio Aero speakers that use a conventional cone driver for the woofer and a BMR driver for the tweeter. Only difference is instead of the BMR driver I will be using DML panel.

[bilidru]

Hi, I'm new to this forum and to DML speakers. I read the first five pages and the last ten and have got some open questions also due to the fact that I don't understand every technical aspect in English, which is not my mothertongue. I'm not a hifi enthusiast. So it's not about building the best speakers.
Page 87 was helpful, as Unbiasedsound answered basic questions.
So I'm going to use two eps polysterene, 10mm thick and one 6 mm for a "bass" Panel. All powered by a fosi audio 2.1 amp.
My question is about how to hang them on the wall? In a wooden frame? Or using some wood construction, but 6 or 10mm don't seem to be much to use cotter pins. So I'm lost here and appreciate any uncomplicated solutions.
Thank you for any answer.

[Unbiasedsound]

Hi, I'm new to this forum and to DML speakers. I read the first five pages and the last ten and have got some open questions also due to the fact that I don't understand every technical aspect in English, which is not my mothertongue. I'm not a hifi enthusiast. So it's not about building the best speakers.
Page 87 was helpful, as Unbiasedsound answered basic questions.
So I'm going to use two eps polysterene, 10mm thick and one 6 mm for a "bass" Panel. All powered by a fosi audio 2.1 amp.
My question is about how to hang them on the wall? In a wooden frame? Or using some wood construction, but 6 or 10mm don't seem to be much to use cotter pins. So I'm lost here and appreciate any uncomplicated solutions.
Thank you for any answer.

You can use any picture or art canvas wooden frames....Depending on how much your DML panels weigh you can use galvanized 20 gauge wire on the frame and just hang them on a dry wall screw. Also there should be at least a 1 inch gap from the panel to the back wall as these are bipolar type of speakers where sound also radiates from the back. You can use some type of soft rubber/foam like this on the back of the picture frame. Cut 8 pieces about 1 inch and place them evenly on back of frame. This rubber foam will also prevent the wooden frame from rattling when touching the wall.

[bilidru]

You can use any picture or art canvas wooden frames....Depending on how much your DML panels weigh you can use galvanized 20 gauge wire on the frame and just hang them on a dry wall screw. Also there should be at least a 1 inch gap from the panel to the back wall as these are bipolar type of speakers where sound also radiates from the back. You can use some type of soft rubber/foam like this on the back of the picture frame. Cut 8 pieces about 1 inch and place them evenly on back of frame. This rubber foam will also prevent the wooden frame from rattling when touching the wall.

Oh, perfect. That sounds great. Thank you for your immediate response.
I've found 50cm square eps panels 10 and 6 mm thick. Are these measures ok for a 25mm exciter? They seem so thin...

[Unbiasedsound]

If you are using a frame it should be ok since the frame helps support the EPS.

[LOUT]

For whatever it's worth, the newer Dayton BST-2 bass shakers seem to work okay as a DML-bass device. They can get the furnature and floor moving enough at higher wattage to make hearable bass around 35hz and up (though I haven't yet tried mounting to a flat/loose panel.
They also play full-range if left to do so, which I'd expect should help them to cross-over whereever you want OR maybe simply use them full-range with some EQ if they happen to be good enough (I'm not sure if their full-range output is loud enough since I've not used them with a loose panel yet).

Mostly, I think their current new/sale price around $25 on PE makes them a lot more tempting to experiment with compared to their $50-80 cousins, while they still keep a lot of the claimed handling and force of those models...at least that was my thoughts when grabbing them. A lot of fun so far (though their supposed response down to 10hz seems a dubious claim to me right now; more like 25-35hz unless they have a reeeeally long breakin period).

[bilidru]

If you are using a frame it should be ok since the frame helps support the EPS.

is it ok or even helpful to put some foam between panel and frame?

[Unbiasedsound]

is it ok or even helpful to put some foam between panel and frame?

Yup that is how the EPS is suppose to be mounted to the frame using the rubber foam. I was going to mentioned it but I just figured you already read up on it.

Here are beginner steps to prepping DML panel.

1. Iightly sand both sides of EPS with 100 grit sandpaper and then 220 grit to smooth it out.

2. Coat both sides of the EPS with around 70/30 water/glue mixture. Let dry for 3 days.

3. Paint the front side with oil based gloss paint any color that matches your decor.

4. To attach EPS panel to frame use Frost King rubber foam.

5. For temporary attachment of exciter to the EPS panel use the sticky tape that comes with the exciter. If you want permanent use 5min. 2 part epoxy adhesive.