Announcement

Collapse
No announcement yet.

DIY Flat Panel Speaker Love

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Alphas
    replied
    Extruded foams are cut with foam cutter, the dimensions are 60x30cm, edge rounded at 10cm. The local stores only carries it in blue color, all of them are edge rounded and buffed to give a clean look.


    Next was the spacers, I used wood block and acrylic to make them. The total thickness is 3.0cm, so the exciters can be glued on the panel surface and the panel will be mounted on the spacers with velcro.

    Leave a comment:


  • Unbiasedsound
    replied
    Plywood is not one of the better sounding woods most likely due to the glue dampening the wood which also hinder spl levels.........I prefer Balsa, spruce or bass woods, but they are more expensive.

    For the most COHERENT sound only 1 exciter should be used per panel....multiple exciters used per panel will increase spl levels but you wont get the same coherent sound when using only 1 exciter on each panel as there is no way one can completely stop the waves from overlapping each other on the same panel....The only way to completely stop the waves from overlapping is to use multiple separate panels to create one big panel like in a line array.

    Leave a comment:


  • Alphas
    replied
    Had been busy with work past few weeks but I managed to get some parts done. The wooden plywood are cut with laser machine and curved to remove harmonics. The 5mm thickness plywood has the dimensions 60x30cm. The longer piece is for the center speakers, 98x30cm, all edges rounded at 10cm. The lightweight 3-ply plywood is flexible and should provide a good frequency response to the high range.


    Leave a comment:


  • Unbiasedsound
    replied
    I hope those aren't the DAEX30HESF-4 exciters....because if they are I am totally jealous right now. LOL....Those are IMO one of the best exciters that P.E. has to offer.

    What type of wood are you using and what is the size and thickness?

    Leave a comment:


  • Alphas
    replied
    Hi Everyone, I am from Singapore. Recently I did a home renovation and decided to create a cinema home theatre with Xiaomi UST laser projector and flat panel exciters.

    Next, av receiver for the home theatre setup wtih the Xiaomi wemax projector. I got Sony DH-790 7.2ch Dolby Atmos receiver. Going to setup 7.1 home theatre 7 exciters not speakers. The exciters are here and I will be using wooden panels for the sound. Let see how this goes!




    Come back again for updates!

    Leave a comment:


  • Unbiasedsound
    replied
    Benji, you could even make your panels a octagon shape if that would please you more aesthetically....Also I prefer 70% water and 30% glue mixture as its not as thick as the standard 50/50....I find that anything too thick can add extra weight and dampen the panels.

    Leave a comment:


  • benjicon
    replied
    I think I may revisit my shaping before I push ahead... the topic of rounded corners keeps coming up as the number one way to improve sound and I'm still early enough in the process to make the important edits.

    Leave a comment:


  • Unbiasedsound
    replied
    Anything DML is ok to post on this topic since its all about DML Flat panel speaker love.

    Everyone has there own idea/design in mind to fit there own needs and desires, which is what makes these panels fun to build.

    For me its all about audiophile sound quality, no compromises. Everything else like aesthetics is secondary.

    Today I want to talk about ideal panel shape......When buying EPS or XPS panels they are either square or rectangle in shape....The first basic steps is to round the corners of the panels which makes the panels sound better.

    With the corners rounded its not actually a rectangle or square shape anymore but rather a sort of octagonal type of shape....When you look at the pictures of Bertagni's speakers the back side of the outer edges of the panel its shaped like a uneven octagon...I've always wondered why Bertagni would use that octagon shape instead of just using a oval (ear) shape like he did with the middle of the panel.

    Maybe Dr.Jose Bertagni knew about the sound shapes patterns at certain frequencies? Like in this video> https://www.youtube.com/watch?v=AS67HA4YMCs

    Any who just something to ponder on.

    Leave a comment:


  • benjicon
    replied
    I should add too.. I have deviated a bit from some of the guides and recommendations I referenced, I have an aesthetic and goal in mind thats going to see me flirting with compromises that will effect the sound, I might run into mistakes or a less than desirable sound at the end of this process.. but thats the fun right ? Making mistakes along the way so I can do it better and with more knowledge next time :P

    Leave a comment:


  • benjicon
    replied
    I hope this is ok to post here. I'm not the OP for this thread but I felt it will be more useful to people that find their way to this thread than if I start another one.

    So I found some time over the weekend to start my flat panels, with the goal to make speaker panels out of the optimum material that will also let me use them to create art works on. The core challenge for me is going to be finding a balance between surface preparation and final finish with my artwork applied to it without effecting or compromising the sound quality too much.

    It seems generally accepted that the best and most cost effective material is XPS (extruded polystyrene)... Home Depot in Canada has 2'x2' panels for $8. I grabbed a couple, some sandpaper, xacto blade, wood glue. The first step was for me to shape the edges of the panels to minimize any distortion or splashiness.. this guy (https://www.youtube.com/watch?v=zdkyGDqU7xA) recommended rounding the edges for best results so thats what I started with.

    Sanding is a delicate process, I used my xacto blade to bevel the edges then sanded them gently until they were about where I wanted them. I used 220 grit and not a lot of pressure, if you press hard while sanding this stuff it starts ripping holes in it .. so go slow.



    Gave them a rinse, let them dry and coated them with a couple of coats of glue / water mix.. Once they dried after the second coat they were a little toothy, so I gave them a light sand with 300 grit sand paper, then I made the mistake of giving them a quick rinse with water to get all the dust off.. this reactivated the wood glue so I ended up with very sticky panels that I couldn't stand anywhere for a a while til it re-cured.







    This is after the wood glue water has re-cured, surface it nice and even and ready for painting.

    Leave a comment:


  • Limbo
    replied
    I have one exciter on a standup bass (double bass) and another on an acoustic guitar, both on floor stands in a L/R stereo configuration. Sounds outstanding for classic music, especially string quartets and chamber music. Also sounds nice for instrumental jazz. What really made me smile was listening to the classic "Dueling Banjos." It was recorded and mixed with true stereo separation (one instrument per channel). It feels like a ghosts are playing the instruments while you are looking at them, the sound comes through so well, and the separation is so exact. I augment the low end with a small subwoofer for other types of music.

    This solution is not ideal for vocals. The voice components have too much echo within the instrument body. It may help if I play with the placement of the exciters. I plan on adding a couple flat panels with exciters and drive them from the Front-B outputs on my beefy Marantz SR7500. This will bring out the vocals and improve the sound of rock music. I can turn off the A speakers (string instruments) when listening to rock music.

    Leave a comment:


  • Roadsterdriver
    replied
    Originally posted by Vinaudi View Post

    I am also interested in ways to power them at the source so a signal can be pushed wirelessly.

    Ideas?
    Same here. This looks like a possible integrated solution. Probably Lo-fi, but I’m going to try it out for non-critical listening games rooms.
    https://www.parts-express.com/dayton...mote--300-3820

    Leave a comment:


  • Unbiasedsound
    replied
    Originally posted by Roadsterdriver View Post

    Oh, thin material...interesting design.

    Do do you have any pics
    I don't have any pics right now but my panels design is very similar to Bertagni's design > https://img.auctiva.com/imgdata/1/6/...1777455_tp.jpg

    Leave a comment:


  • benjicon
    replied
    dawnut Thanks for the tips on the water based spray paint, I'll keep them in mind as an alternative option. Definitely viable for the artwork.

    Leave a comment:


  • benjicon
    replied
    Originally posted by Unbiasedsound View Post
    Coating the whole panel of XPS will not only add some weight to it but dampen the panel reducing volume out put and sound quality....unless you can dilute the epoxy to where its similar to the 50/50 water glue mixture....That would probably require some type of thinner like acetone or laquer but those type of solvents do not do well on polystyrene due to there corrosive properties.
    Thanks for the suggestions and nuggets of knowledge. There is a new type of resin available called "Art Resin" very low toxicity and easy to work with. I can thin it out by placing each of the parts (2 part epoxy) in a hot water bath which will reduce the viscosity of the combined solution. I don't know yet if it will match the viscosity of a 50/50 wood glue solution.. I'll be sure to share the results.

    Leave a comment:

Working...
X