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FDP Forum / Amp Mods, Repairs, and Projects / Speakers...distributed mode speakers, that is

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Hammond101
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So. Cal. USA

Apr 2nd, 2018 03:27 PM   Edit   Profile  

I think this may be from the nature of the medium used as the baffle if that is the correct term. I would think a foam sandwich would exhibit some difference front to back. I would think the distance from a reflective surface may enter big as well. Maybe a double smooth side Masonite material would work.

I have surrounds that sit on stands at the rear of my viewing/listening room. This type of panel speaker could easily be mounted to the vaulted ceiling above and sound great. It would be the narrow end of the vault so sound would be reflected into the room. Proximity to the wall might help low end response if these respond anything like a regular cone driver. The system has a sub, a big Klipsch sub!

Cal-Woody

USA/California

Why do I keep fixing things that work?
Apr 2nd, 2018 05:58 PM   Edit   Profile  

One thing I find interesting is that high frequencies travel faster and take less volume and the low/mid frequencies travel slower, so it sounds like you are creating an acoustic environment/cabinet extension for the mid/low frequencies to reflect from the wall/ceiling, but do the high frequencies get blaring before the other sounds catch up or does the coupling of the surfaces create a better spacial effect for the other frequencies, thus making for a better surround sound?
Does it feel more like a theater sound system?
This is truly some dark magic that you're dabbling with! Lol

Leftee
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VA

I say stuff
Apr 2nd, 2018 07:06 PM   Edit   Profile  

I once made a pair of telephones with some string and two tin cans. This is way more groovy.

Peegoo
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Get ready for the

Buena Buena
Apr 2nd, 2018 07:29 PM   Edit   Profile  

The distance from a wall does matter because the center of the reflected frequencies will be a wavelength 2x the distance of the panel from the wall. You'll get partial phase cancellation at that frequency.

But it's really not that noticeable, and if it's an issue, it helps to apply some sound absorptive material to the wall surface.

I've got some little 10" x 12" foam trays that I'll make small DMLs with and see if they are adaptable as a guitar speaker.

The very cool thing about these is their efficiency: they are pretty loud, even when running low power to them.

Order up some audio exciters and play around with 'em. They is cheep! Rest one on your desktop and it turns the desk into a speaker. Attach one to a textbook and it turns it into a speaker. It's weird.

This is the same technology the medical community uses to help people with impaired hearing due to faulty ear drums. A small transducer is placed against the bones of the skull and the person hears better.

I may try mounting one on my

foil helmet.

stratcowboy
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USA/Taos, NM

Apr 7th, 2018 01:38 PM   Edit   Profile  

The kitty looks very impressed.

Peegoo
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Get ready for the

Buena Buena
Apr 7th, 2018 09:25 PM   Edit   Profile  

My next experiment with these is foam picnic plates.

You can buy a hundred for a nickel.

A nickel, I tellya!

Peegoo
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Get ready for the

Buena Buena
Apr 10th, 2018 10:59 PM   Edit   Profile  

I got sidetracked and tried these exciters on a bunch of flat flexible surfaces...one of which was an empty steel gallon can that once held mineral spirits.

I've made a few "oil can" guitars and ukuleles, so why not turn one into an amp or a speaker cab? The lid on top could be the volume control. These are a cinch to cut and drill because they're super-thin steel.

Because the diaphragm is metal, the thing makes an electric guitar sound like a resonator guitar when played from a clean amp. Playing with a slide and a little overdrive sounds downright wicked.

I'm working up a prototype to see if this is something that will be useful.

Might even make sense to install a small battery-powered amp into an oil can guitar and amplify the thing through the steel body.

This is getting more fun.

(This message was last edited by Peegoo at 01:17 AM, Apr 11th, 2018)

Leftee
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VA

Apr 11th, 2018 04:54 AM   Edit   Profile  

(-:

Peegoo
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Get ready for the

Buena Buena
Apr 15th, 2018 09:56 PM   Edit   Profile  

I stuck an exciter to a thick paper plate and it sounds pretty amazing. I'm going to make a speaker cab from foamboard and mount the plate on the front.

It will be the lightest 1x12 guitar cabinet ever!

Leftee
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VA

Apr 16th, 2018 07:03 AM   Edit   Profile  

A true geezer cab!

willie
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Too Near Atlanta GA

Amp Tech Emeritus
Apr 16th, 2018 08:20 AM   Edit   Profile  

Interesting stuff....this old dog learning new tricks, thanks for the edification. :)

w

orrk01
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USA / Saint Paul, MN

Apr 22nd, 2018 07:16 AM   Edit   Profile  

I ran into the youtube video that Peegoo linked around a month ago and I was so intrigued I had to give it a try. I ordered a couple of audio exciters from Dayton and followed the instructions shown below to a 'T'.

The speakers are now suspended from my ceiling via 10 lb. fishing line. I wired them in series with some old no-name speakers I bought at a garage sale decades ago. That added enough bass to make the whole setup sound pretty good.

Everyone I have shown the setup to can't believe they sound as good as they do. I'm not an audiophile by any stretch of the imagination but I can't think of any other way to get decent sound for less than $50 for a pair of speakers, well except at a garage sale. And it's a fun and easy project to do.

Easy Project to get started

Peegoo
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Get ready for the

Buena Buena
Apr 22nd, 2018 09:06 AM   Edit   Profile  

orrk01, have you noticed greater efficiency of the DML compared to a typical speaker?

I have a pair of very nice Yamaha 8" three-ways that are near top of the line, and when run in series with a DML, the DML is twice as loud at any volume setting. This applies to mid- and upper-range frequencies only though. I tested it with a freq generator, both sine and square wave, and the DML is consistently louder by about 50%.

orrk01
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USA / Saint Paul, MN

Apr 22nd, 2018 09:34 AM   Edit   Profile  

Yes, the DML speakers are appreciably louder. I had thought it was due to the fact that they are 4 ohm speakers and the 8 ohm speakers I wired them with are old and of questionable quality. I bought them at a garage sale many years ago. They were paired with a Heathkit receiver the seller had assembled probably in the 60's. I think he took $10 from me so I would haul it all away. But the old 8 ohm speakers add just a touch of needed bass to the whole setup that makes it work.

orrk01
Contributing Member
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USA / Saint Paul, MN

Nov 9th, 2018 07:17 PM   Edit   Profile  

I finally broke down and bought a subwoofer to add to my DML speakers. In combination with the DML speakers, the subwoofer sounds much better than the old Allied speakers I had wired in series with the DML speakers to add some needed bass. The Allied speakers are back in the basement.

Anyone else done anything new with this project?

Peegoo
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Well ya go to a bar

on a Friday evenin'...
Nov 10th, 2018 06:11 AM   Edit   Profile  

I've tried a bunch of non-speaker items to see how they work. Metal oil cans, the backs of end tables, etc.

What works best? Acoustic guitars. Mount an exciter inside, center of the bridge plate. Leave the strings off, or they resonate and make it sound weird. But holy cow, suspended from a guitar hanger with the back also free to vibrate makes for some really good sound--especially when listening to recordings of acoustic guitar and stringed instruments like violin, cello, etc. Pretty amazing.

I might buy two cheepo classicals (they're made lighter, with a more flexible top than a steel-string) and turn them into my speakers of choice.

orrk01
Contributing Member
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USA / Saint Paul, MN

Nov 10th, 2018 07:30 AM   Edit   Profile  

Peegoo,

I have seen youtube videos where people have placed exciters in unstrung acoustic guitars. Of course, on youtube everything sounds like my computer speakers so I couldn't really tell how effective the guitars were. That sounds like a cool project.

I should mention why I felt the need to add a subwoofer to my setup. I found that the audio exciters were becoming extremely 'over-excited' whenever they were slammed with low frequencies around 40 - 50 Hz. They jumped like little frogs and caused an unpleasant buzzing effect. I decided to add the subwoofer to handle the lower frequencies. I was contemplating adding high pass crossovers to the DML speakers but I was able to get the frogs to quit jumping by merely turning down the bass on my receiver (a much cheaper solution).

Have you had any issues with the lower frequencies? And, if not, what's your secret sauce?

Leftee
Contributing Member
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VA

Caught snipping the Bright Cap
Nov 10th, 2018 08:23 AM   Edit   Profile  

Guitar speakers...



Like!!

Peegoo
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Well ya go to a bar

on a Friday evenin'...
Nov 10th, 2018 09:07 AM   Edit   Profile  

They don't work well when the volume is cranked up.

At moderate volumes (with large radiator surfaces) I'm getting good reproduction of lower frequencies. I don't listen to music cranked up very loud.

If you're used to listening to music at high volumes, or you like to feel the thump, you do need to add a sub.

BbendFender
Contributing Member
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American Patriot

About as ordinary as you can get.
Nov 10th, 2018 09:41 AM   Edit   Profile  

I've been watching some YT videos on these exciter speakers. They are simply amazing. I've been a speaker nut since I was a kid. I may make some of these things.

Previous 20 Messages  

FDP Forum / Amp Mods, Repairs, and Projects / Speakers...distributed mode speakers, that is




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