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DIY Flat Panel Speaker Love

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  • Unbiasedsound
    replied
    Originally posted by listencarefully View Post
    First post to this forum. This thread is very helpful!

    I built a couple dml speakers using the 2’ x 2’ xps project panels. My goal is to use them outside.

    I used the Dayton Audio DAEX25 (5w) exciters powered by the Lepai LP-2020TI - 20 Watt amp. I think they produce plenty of volume but definitely miss the lower frequencies.

    I have the ability to get 1lb or 2lb eps foam in basically any thickness and size. Would there be an ideal combination that would pair well with an outdoor sub?

    Thanks in advance!

    I would get the higher density EPS. IMO Ideal thickness is around 1/4 inch (5-6mm). Size of panel is optional but like with smaller conventional cone speakers it seems that smaller panels image better. A small panel is one that is 10-12 inches in width and 14-16 inches in height if its a rectangle shape. If its a square shape then 10-12 inches even on all sides. Best all around exciter IMO is the T.E. TEAX19CO1-8. as it has the best balance of highs and lows. Coat both sides of the panels with PVA glue mixture of 80% water and 20% glue. Then you can spray paint ONE SIDE of your panels any color you want with a very light coat of gloss enamel spray paint. EPS is sensitive to corrosive chemicals so do not spray too much paint in one spot. Spray at least 2-3ft. away from panel. The side with the paint will be the front of the panel the side without the paint will be the back where the exciter will reside. Exciter placement should be close to the middle/center of the panel give or take a couple inches from the center, you need to play around to find where the best high freguencies will be close to the center. Once you find that perfect location you can either use the sticky tape that comes with the exciter to mount it to the panel but the sticky tape tends to fail after a while so if you want it permanent you can use the 5min. 2 part epoxy glue but make sure you remove the sticky tape from the exciter if using epoxy glue..

    Its best to mount panels in a wood frame. Depth of frame can have different outcomes. A frame the same thickness as your panels will be more holographic while a frame with a deeper depth then your panels can have a more focused type of sound, its personal preference. There are many ways to mount the panel to frame and it will depend on ones design. For smaller panels I use Frost King foam all around the edges and snuggly fit it in the frame. Other methods is double sided tape or painters blue tape. Small panels should be placed on low stands so that the panels are below ear level and or you can build built in stands on the frame with just a wider piece of wood so that the frames dont tip over. You can also use a small 2inchX2inch piece of wood between the frame and wide wood to act as a decoupler. sp? lol

    Since you are using a sub you dont have to run the exciter full range. If your receiver/amp does not have a high pass Xover you can just use a high pass (200uf) Nonpolarized electrolytic capacitor at around 100hz. Then you can dial in your powered sub at 100hz for low frequency.

    Leave a comment:


  • listencarefully
    replied
    First post to this forum. This thread is very helpful!

    I built a couple dml speakers using the 2’ x 2’ xps project panels. My goal is to use them outside.

    I used the Dayton Audio DAEX25 (5w) exciters powered by the Lepai LP-2020TI - 20 Watt amp. I think they produce plenty of volume but definitely miss the lower frequencies.

    I have the ability to get 1lb or 2lb eps foam in basically any thickness and size. Would there be an ideal combination that would pair well with an outdoor sub?

    Thanks in advance!


    Leave a comment:


  • Unbiasedsound
    replied
    Like I've stated before DML's are similar to O.B. speakers but have a bipolar effect where sound radiates (almost) equally from the front and back. I've been watching GR Research (Danny Richie) videos on Open Baffle speakers and I've learned a lot from him even utilizing some of his techniques on my DML panels.

    Leave a comment:


  • JoeC
    replied
    Thank you for your reply Unbiasedsound!

    Leave a comment:


  • Unbiasedsound
    replied
    DML's are best when used like a open baffle design since sound is radiating from the front and the back, similar to a bipolar type of loudspeaker but not exactly as the radiation pattern are in and out of phase but so close together that the only difference is a "DIFFUSED" type of sound when compared to a conventional cone bipolar speaker.

    This diffused type of sound is less susceptible to room reflections as a diffused sound has a weaker reflection. Conventional cone speakers are more susceptible to room reflections which is why some need "DIFFUSERS" to stop those strong reflections.

    Like Open baffle speakers DML's should be at least 1ft. away from the walls with 2-3ft being ideal for optimum performance.

    DML panels should also be placed at or below ear level. I prefer slightly below ear level because DML's have really good vertical dispersion. DML's also have very wide dispersion also so toe in is not really needed. In fact they can sound good even slightly toed out. lol


    Leave a comment:


  • Unbiasedsound
    replied
    Originally posted by JoeC View Post

    Would that help the bass response like a bass reflex speaker?
    It could a little but its not like a bass reflex speaker since most of its energy is modal 100hz and up instead of being pistonic like a conventional cone.



    Leave a comment:


  • Unbiasedsound
    replied
    Originally posted by JoeC View Post
    hey all,
    Newbie and new user on this great forum. Although I have read a bunch of threads on this particular form, I can not find how you are setting up to use the exciters on an 8ohm receiver, because all the recommended exciters are listed at 4 ohm. So.... do I need to get 4 exciters and run two in series of the right and left channel or is there something else I can do to experiment with these with only having to spend the $$$ for just two exciters?
    I do apologize if this question has been asked before, but I can not find the thread that relates to this
    Thanks!

    Edit: I have a 110w 1986 Fisher receiver that I will be using on this experiment
    You can just buy the 8ohm exciters. IMO the best 8ohm exciter is the Tectonic (19mm) TEAX19CO1-8. It wont handle the power of the larger (over 19mm) exciters but this exciter will have better high frequency response then the larger exciters.

    Leave a comment:


  • Unbiasedsound
    commented on 's reply
    My DML sub is just a DML panel but utilizing a sub amp so it will only produce the low frequencies from 150hz and below. Exciter used are the larger 25mm and up exciters and they can handle more power and have more excursion.

    The reason for a sub amp is because the exciters voice coil is attached to a heavy thick plastic that is suppose to hold up the exciters weight/magnet so the exciter is not efficient in the low frequencies. To compensate you will need a sub amp to push the exciters into pistonic motion to produce the low frequencies.

  • JoeC
    replied
    Originally posted by Unbiasedsound View Post
    If you want to utilize some of that energy from the back of the DML panel you can also make a front firing slot port as this will increase sound output from the front.
    Would that help the bass response like a bass reflex speaker?

    Leave a comment:


  • JoeC
    replied
    hey all,
    Newbie and new user on this great forum. Although I have read a bunch of threads on this particular form, I can not find how you are setting up to use the exciters on an 8ohm receiver, because all the recommended exciters are listed at 4 ohm. So.... do I need to get 4 exciters and run two in series of the right and left channel or is there something else I can do to experiment with these with only having to spend the $$$ for just two exciters?
    I do apologize if this question has been asked before, but I can not find the thread that relates to this
    Thanks!

    Edit: I have a 110w 1986 Fisher receiver that I will be using on this experiment

    Leave a comment:


  • Unbiasedsound
    replied
    If you want to utilize some of that energy from the back of the DML panel you can also make a front firing slot port as this will increase sound output from the front.

    Leave a comment:


  • Unbiasedsound
    replied
    Originally posted by NW Sailor View Post
    First post to this forum, apologies if I get things wrong.

    i have a need to place audio monitors in a setting that is extremely space constrained, and think the flat panel approach could be really helpful, ie a monitor that is <3 inches thick. However, it seems there is no easy way of making the flat panel ‘one sided’ so that the volume on one side is loud, the other side quiet. I think I know the answer, that there isn’t an easy way to do this but thought I would throw the question out to this group - is it possible to build some sort of thin enclosure / baffle on the “back” of the panel to stop sound going in that direction?

    thanks for any insights.
    Yes its possible to build a sealed enclosure on the back just like a conventional cone boxed speaker. I would make a 1inchX2inch frame and just cover the back with a thin (1/4-1/8) piece of wood.

    Leave a comment:


  • NW Sailor
    replied
    First post to this forum, apologies if I get things wrong.

    i have a need to place audio monitors in a setting that is extremely space constrained, and think the flat panel approach could be really helpful, ie a monitor that is <3 inches thick. However, it seems there is no easy way of making the flat panel ‘one sided’ so that the volume on one side is loud, the other side quiet. I think I know the answer, that there isn’t an easy way to do this but thought I would throw the question out to this group - is it possible to build some sort of thin enclosure / baffle on the “back” of the panel to stop sound going in that direction?

    thanks for any insights.

    Leave a comment:


  • mhester
    commented on 's reply
    I saw the Tech Ingredients vid a year or so ago and have wanted to experiment with this at some point (need to finish my Classix 2.5's first...) This is a very long thread and I'm not sure if you've previously posted your sub design. Can you kindly share that (again?)

  • Unbiasedsound
    replied
    During this covid time (3 months 7 days a week 2-4 hrs a day lol) I've been experimenting with many different placements of the exciters including the use of 2 exciters per panel. What I have found is that the 2/5-3/5 rule of exciter placement is bogus. Not sure who first thought of those placements as the standard (NXT?) but it seems P.E. guide and T.I. youtube vid like to use those placements.

    Most just blindly follow those standard placements instead of experimenting for themselves as most cant think outside the box. lol

    Leave a comment:

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