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  • Zene
    replied
    Almost forgot what I was going to ask ... Contemplating putting heavy mass (supported) attached to magnet to prevent movement instead of brace to frame. I alluded to this before, but too lazy to look.
    Last edited by Zene; 04-07-2019, 04:14 AM.

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  • Zene
    replied
    Unb ...more panels should have been built around the country so other people could get a chance to hear them properly. Initial ads showed them to be playtoys and stocking stuffers. Unfortunately for us DIY pretty much died out. I've tried to get others to do a little reading but not getting any results. I'm in new town so lost all my stereo friends. Streaming the top 40 has bitten them, too. I mentioned them to my good (stereo) friend of 40 years who usually likes new things and he very quickly said he was not even interested.
    I won't be able to demo mine properly as I'm in apt complex.
    I have an ext headphone amp for phone. It might drive 2 - 8 ohm exciters in series on a small panel for demo.

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  • Unbiasedsound
    replied
    I just revised my "Bastat", sats/sub DML panels using a slightly larger panel and a larger 19mm exciter instead of the smaller 13mm exciter.....The bass and spl has increased as well as the fullness of the sound....They are now even listenable without the sub.

    If I could display my panels at the Midwest audio fest I know for sure I could get more people interested and also realize the true potential of exciters/dml's.

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  • Unbiasedsound
    replied
    Don't have a pic.
    Last edited by Unbiasedsound; 07-24-2019, 09:44 AM.

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  • Zene
    replied
    Yep, me too. Always wondered why the magnet moving back and forth would be good. Did think it might be a synchronous push-pull thing, but nice to hear a sound explanation. I will look for a good solution. First is a huge mass so force cannot move. From there I'm lost.

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  • Unbiasedsound
    replied
    I was always for bracing of the exciters....Why because it does 2 things.....The first is that the magnet of the exciter needs to be braced/held in place so that the voice coil has something to push off of as without a brace the voice coil will push off of the panel material and move the magnet instead of moving only the panel....The second reason a brace is needed is it prevents voice coil sag while the brace holds the magnet in place the frame holds the panel material in place basically like a conventional cone speaker which uses the metal basket as the frame.

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  • Zene
    replied
    Hi gang ... some confusion here. Most of you have shied away from bracing exciters because of transmitting vibrations to the frame. If an exciter is rigidly mounted, but not connected to frame or any vibrating material, wouldn't performance be greatly improve?


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  • Unbiasedsound
    replied
    Your welcome, I am just glad to see someone else is interested in this technology as not many realize the potential of exciters/dml panels.

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  • Zene
    replied
    Unbiased ... I have appreciated all your posts that got me to this point, now I can start.
    I've never liked full range single OB speakers even when back loaded. There was nothing there to excite me having come from big horn breeding; Khorns, LaScalas and various large straight horns. I have used OB a lot, but with large drivers in normal bandwidth situations.
    Getting to the point I thought of a way to optimize a pseudo OB some 20 years ago, but ever tried. That is using two identical drivers on the same panel, but crossing them over. Distortion would be cut greatly as well as efficiency leading to a cleaner sound, also.
    I can compliment that principle with DML's. Same driver on each of two different panels. one small and one large as you suggested. My Ashly active crossover can cross with it's variable slope feature and should give an almost seamless transition. I will keep the panel sizes constant so I have one less variable to contend with. Zene

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  • Unbiasedsound
    replied
    Small panels are usually under 15inches (about the size of a bookshelf speaker) while larger panels are 2ft. and up.....XPS or EPS material rectangle shape width 10inches height 15inches, and thickness of panel should be 1/2inch with at least a 19mm exciter of your choice.

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  • Zene
    replied
    Thx, I guess I should modify question a bit. Better thought out range would be 300hz to as high as possible. That said what is considered to be a small panel and what is large? Zene

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  • Unbiasedsound
    replied
    Bigger panels will produce more bass, while smaller panels will produce less bass.

    I am not totally sure what you are asking but if your goal is to produce sound in the 300-3khz range then it would be better to use a smaller panel....its basically the same concept of conventional cone drivers for example if you wanted a conventional cone driver to produce sound in the 300-3khz range would you choose a 3-4inch driver or a 10inch? Ideally I would choose the smaller 3-4inch driver for that specific frequency range.

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  • Zene
    replied
    Hi gang ... has anyone compared a small panel to a larger one using the same frequency bandwidth? I know there are a lot of variables. My dilemma is bass being verboten in my apartment complex. Not a big deal as I prefer to listen under 80db and no rock. Question relates to quality of one vs the other. I've usually suspected bigger in this case might be better as there would be less excursion. My goal is super sound for decade of 300 to 3k hz. I do have good woofer (not subwoofer) if I need and ribbon tweets are available. I can also play around with active crossover. Zene

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  • Unbiasedsound
    replied
    Ahhh ok now I see it, you really have a good eye.

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  • Cahudson42
    replied
    About 20 seconds in:
    https://youtu.be/dvHrtYBf8lU

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