DIY Flat Panel Speaker Love

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Tectonic BMR Speakers Before/After Audio Quality Difference in Underground Railway Station - YouTube

Lets see if anyone can tell me why the BMR speaker is more intelligible then the conventional cone driver?

What causes conventional cone speakers to sound unintelligible in that underground railway station? Answering this question will give one a hint as to why DML/BMRS are more intelligible.

[LOUT]

I like this.
Easy-to-digest bulletpoints with helpful tips.
If someone disagrees for some reason or wants to know the "why" behind the tips, it can spark conversation.
Good stuff.

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Basic Do's and Donts of DML.

1. DML's should not be placed directly on the wall as sound radiates both from the front and back. Now if you modify a DML panel then you can place it on the wall, which is to enclose one side of the panel so that only one side radiates sound. Or you can place the panel directly INWALL.

2. Like with most conventional cone speakers a DML's height placement should be at around "EAR LEVEL". I see a lot of people hanging there DML panels very high up like surround sound speakers.

3. To sound its best DML's need to be at least a foot from the rear wall.

4. For my designs a "FRAME" is a must. I do NOT believe in hanging panels. Also a frame is needed to attach the spine brace to hold the exciter in place. Without a frame there is no were to attach the spine/brace on a free hanging panel.

5. The height of a DML panel should not be higher then your head when seated, unless you are sitting really far back. I see some people making there panels 8ft. tall in which it is to high for such a small room.

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Today I want to talk about a DML subwoofer. Just last week I decided to rebuild my DML subwoofer using a Dayton puck bass shaker. I bought the puck bass shaker about a year ago and experimented with it for a brief time but never really got around to making a final sub design for it.

All I have to say is WOW. lol These puck bass shakers are the key to DML low frequency bass. These wont play really loud or hit you in your chest like a conventional cone subwoofer but what they do is make very tight/accurate/articulate bass. If one DML sub is not enough I am sure TWO will do to satisfy one in the bass department.

How do you build one? Simple you just follow the basic fundamental steps of DML. OH WAIT yawl dont even know the basic fundamental steps? LMAO

This is why I cant stress enough the basic fundamentals of DML 101 because everything including a DML sub starts with the basic foundation techniques.

The Dayton puck bass shaker is now double the price it use to be just around a year ago. I was hesitant to post this info since the more people that buy this product the more the price will rise especially in todays time when inflation is at a all time high and still increasing. Its better to buy it now then wait 3 months when the price doubles again. LOL

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I dont think many people visit this forum. Plus the title of this topic does not include the words DML so many will just pass it up.

There is no white paper on these basic fundamental techniques in designing a DML panel, unless I write my own white paper. lol

The problem is many do not understand these basic fundamental 101 techniques. One cant disagree if one does not know WHY each specific technique is done.

I dont think people arent engaging because of my condescending tone. In fact a condescending tone usually brings on a challenge. The problem is there are no challengers due to lack of participants aka forum members interested in DML and or lack the knowledge.

I follow the topic on the DIYaudio forum and its mind boggling the stuff they come up with as if these panels can defy physics because they dont even understand the fundamental basic steps in designing a DML panel. Including those that seem to be veterans on DML. One cant build on a weak foundation as everything built on top will eventually crumble. Once you get why the fundamental foundation techniques are used it will set you on the right path.

If you've been following my recent posts I have mentioned that these DML panels are very similar to conventional cone drivers as you cant defy certain physics.

My questions are to make people "THINK FOR THEMSELVES". Most people seem to like to "COPY" someone elses design instead of designing it themselves.

I am not concerned if anyone replies to my posts, its more to make one think and pounder on those questions and seek the truth for themselves.

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Perhaps some simply disagree, or maybe they don't feel like answering/engaging at the time?
I literally don't know why DML corners "need" to be rounded, so in my case digging through 244pages would be a hindrance more than a boon.

I do feel like your specific questions here, if meant to act as teaching tools, should probably include a link to the whitepaper or thread or page detailing the reasoning behind the answer.

I also admit to automatically reading your questions here in a pretty condescending tone, so that might be making some people avoid engaging if they're having the same issue I am...though I'm not sure how you could change that because I'm not exactly a beacon of good communication.

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Its sad when people dont even know the basic foundation questions of DML. On the DIYaudio forum they dont even know why the corners need to be rounded and that topic is 244 pages long. LOL

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Can anyone tell me why EPS needs to be sanded?

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Where have you been lout this has been one of the main fundamental techniques of DML 101 said and used on many forums including this one.

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They do?
If so, to what minimum radius, or to what relatives?

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Did you get this from an article?

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Can anyone tell me why the corners of a DML panel need to be rounded?

[Unbiasedsound]

Tectonic BMR Speakers Before/After Audio Quality Difference in Underground Railway Station - YouTube

Lets see if anyone can tell me why the BMR speaker is more intelligible then the conventional cone driver?

[allenb]

Great information on your experience with bypass caps, thanks for posting. When I get everything setup I'll start listening with the NPEs and then give the bypass caps a go for comparison. You are so right about personal preference and ones design and application! I chuckle when I read speaker reviews. As many know, change one thing, whether it be moving the couch or adding or taking away a rug in the listening area, going from one turntable cartridge to another can make speaker X sound great for one person and in their neighbors setup, sound barely passable. A lot of people never get it that the speaker system is only one piece of the whole delivery system and treat it as if what they hear is a mirror image to what everyone else will experience.

BTW, I got an email showing there was a post in this thread!

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The Audyn copper cap is friggen good IMO but its friggen EXPENSIVE!!!!!!!!!!! I must have lost my mind for a second to spend $55.00 on a pair of by pass 0.1 Audyn true copper caps. LOL