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  • Unbiasedsound
    replied
    I thought this video was pretty interesting> https://www.youtube.com/watch?v=Q0hTamed0-k

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  • Unbiasedsound
    replied
    Originally posted by Unbiasedsound View Post
    Part 2 of Tech Ingredients DML flat panel speaker series. https://www.youtube.com/watch?v=CKIye4RZ-5k
    Except for using a different panel material, he did nothing to further improve on the panels....in fact he disregarded the counter weights. sigh

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  • Unbiasedsound
    replied
    I haven't used a segmented sphere but I did try it on card board boxes and Styrofoam coolers, sound wise boom box quality but not audiophile/hi fi......There was a Styrofoam sphere at a craft shop but I wasn't going to waste money to try it out.

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  • captainjack115
    replied
    Has anyone on here thought to try an exciter connected to a segmented sphere as an omnidirectional speaker.
    I have seen some DIY videosnon YouTube, but they seem to be some sort of modified loudspeaker voice coil and magnef assembly.
    Anyway, I know it's not DML, it just looked interesting to me.

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  • Unbiasedsound
    replied
    Part 2 of Tech Ingredients DML flat panel speaker series. https://www.youtube.com/watch?v=CKIye4RZ-5k

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  • Unbiasedsound
    replied
    During this 3 day memorial weekend I had some time to spare so I built a pair of DML satellite speakers just for fun and it turned out way better then I expected utilizing only one exciter per panel with the panel being very small for a DML panel with the dimensions of it being 10inch wide by 15 inch tall.....Bass is very limited due to a smaller panel and using a very small exciter but the mids and highs are exceptional....Spl output level is also limited due to using a very small exciter but can play loud enough for me in a small 8 X10 computer room...I use my receivers cross over set to 100hz so the speakers can play louder with a cheap 8inch energy sub to handle the low frequencies under 100 hz.

    My family came over for a visit and my cousin seen me tinkering with my small dml panel and he started talking about his new polk signature s15 speakers he recently bought and how good they sound blah blah blah ….then I started to play my DML sat speakers  with the energy sub and he was blown away saying they sounded better then his polks that he paid around $200.00 bucks for.....He said the imaging and detail was better then his polks. He thought I paid over $100 in speaker driver parts including cross over but I told him I am using just 1 exciter full range no crossover (I use my receivers high pass crossover) per panel and each exciter only cost me 2 bucks....He thought I was lying so I showed him my order form. LOL

    He couldn't believe a 2 dollar exciter can produce this type of quality sound.....I told him although this is a good exciter its all dependent and based mostly on ones DESIGN....This single exciter design is what I have learned from building my bigger 2 way Bertagni type design and is based similar to it....

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  • Unbiasedsound
    replied
    Originally posted by Aventura View Post
    I just joined this very interesting forum & learned quite a bit, so much so that I more or less the path to my first DML panel build is clear. I would like to know if anybody has tried, or has an opinion about the DAEX32Q-8 exciter. I will be using an 8 Ohm amplifier so I am constrained to use this exciter. The panel I am thinking about will be small, around 2 x 2' with a single exciter so the exciter needs to be 8 Ohms.
    Although I haven't tried that particular exciter the graph chart shows its high frequency to be lower then other comparable exciters. 
    https://www.parts-express.com/pedocs...ifications.pdf

    Although most 8ohm receivers/amps seem to be able to handle and drive 4ohm exciters its not ideal and could have some long term negative effects.

    I hope Dayton will make more 8ohm exciters in the future like a 8ohm high flux, thruster and Ultra.

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  • Kornbread
    replied
    So far, the exciters I've played around with are very easily driven.  If your amp has any grunt at all I wouldn't think there'd be a problem.   With that said, there is one of those cheap Sure 2x50 watt amps laying here that hates anything remotely approaching a difficult load, so YMMV.     

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  • Aventura
    replied
    I just joined this very interesting forum & learned quite a bit, so much so that I more or less the path to my first DML panel build is clear. I would like to know if anybody has tried, or has an opinion about the DAEX32Q-8 exciter. I will be using an 8 Ohm amplifier so I am constrained to use this exciter. The panel I am thinking about will be small, around 2 x 2' with a single exciter so the exciter needs to be 8 Ohms.

    Leave a comment:


  • Kornbread
    replied
    Originally posted by captainjack115 View Post
    Do you have any particular suggestions for dampening?
    Have any pantyhose laying around?

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  • captainjack115
    replied
    Thanks, much appreciation.

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  • Unbiasedsound
    replied
    Originally posted by captainjack115 View Post


    Do you have any particular suggestions for dampening?

    I thought about some kind of half round rubber hose material, with thin flexible walls, the sort used on high excursion subwoofers.
    I used duct tape on my first prototypes.
    ​I use the Frost king rubber foam weather strip tape that can be bought at home depot.

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  • captainjack115
    replied
    Originally posted by Unbiasedsound View Post

    ​That hollow sound can be fixed with some dampening all around the edges of the panel.

    ​BMR's technology came from DML technology just using different designs.

    ​DML= Exciter, free floating

    ​BMR= Exciter, plus a spline and brace to support and hold the exciter in place.

    Do you have any particular suggestions for dampening?

    I thought about some kind of half round rubber hose material, with thin flexible walls, the sort used on high excursion subwoofers.
    I used duct tape on my first prototypes.

    Leave a comment:


  • Unbiasedsound
    replied
    Originally posted by captainjack115 View Post
    As some of you know, I'm one of the few on here that uses corrugated plastic as a panel material.
    I don't bother much with measurements anymore. For me, what looks good doesn't a!ways sound good. Anyway, I just wanted to say that I learned something interesting about the corrugated plastic panels and how it affects sound quality.
    One day while running pink noise through a panel, I placed the palm of my hand on the top edge, partially covering the flutes. The pink noise sounded "different", smoother, less hollow to my ears..
    The hollow sound is something I was trying to notch out with my Mini DSP. Anyway, I sealed off the fluted ends, top and bottom and found the sound to be smoother, less hollow.
    I don't try to run the exciters full range and treat them more like an ESL. For me, there's no point in running bass through them. They would have to be huge and the exciters fail easily with low frequencies.
    It can be a little frustrating when I compare the exciter panels to my Magnepans. But, on their own with a subwoofer, it doesn't take long to be not only satisfied, but totally entertained with the sound.

    On a side note, I bought a pair of Tectonic BMR drivers from PE (297-2156).
    These things are pretty cool for a small room, 81 db SPL makes them very inefficient. That said, they sound pretty nice and have a really large sweet spot, similar to to a DML.
    ​That hollow sound can be fixed with some dampening all around the edges of the panel.

    ​BMR's technology came from DML technology just using different designs.

    ​DML= Exciter, free floating

    ​BMR= Exciter, plus a spline and brace to support and hold the exciter in place.

    Leave a comment:


  • sdep777
    replied
    I might try using Sonotube and glue cardboard to close off one end and see what that sounds like , kinda fun really and a cheap thrill at that.

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