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DIY Flat Panel Speaker Love

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  • Alphas
    replied
    Alright the update of the flat panel exciters are here. With Dolby Atmos receiver, front surround, top and rear surround, the sound effects are spread all around and phenomenal. The panels are stuck on the spacers with adhesive velro, this allow the panels to be removed when necessary.

    Before


    After
    The exciters are position with a 3/5 and 2/5 rule and diagonally. I found the double sided tape on the exciter's coil will tend to peel off after a week or so, therefore I removed the tape and glue with UHU general adhesive. This will fix the peeling issue and prevent it from dropping. The impedance of the exciter is 4 ohm, so I had the exciters in series to get 8 ohm total impedance. The panels are mounted vertically, which I find give a wider sound stage.


    The front surround are wired with 2 panels on each side, each panel has two exciters. The center is the 98cm width panel


    Top panels are fixed into the ceiling by washers and screws.


    Rear surround panels (extruded foam) are fixed with adhesive velcro tape.

    Enjoying the movies with realistic sound effects and cinema quality, my own cinema theatre. :s12::D

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  • Unbiasedsound
    replied
    Not sure if I mentioned this before or on another site but here is a tip to tighten up the sound of the panels so they don't sound so diffused. Its a simple technique Ive been using for the past 2 years. All you need is some type of soft foam/rubber. I use Frost kings rubber foam tape. Cut a piece off the size of the magnet of the exciter you are using. If your panels are free floating (without a spline) stick the foam directly on the magnet of the exciter. If you are using a spline stick the foam on the spline. With a spline you have more placement options as you can use multiple damping pieces all along the spline to fine tune the sound to your taste.



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  • 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.

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  • 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.

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  • 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.


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