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  • Gary.M
    replied
    First double layer corrugated cardboard. This is limited in high frequency extension with all exciters tried.

    Click image for larger version

Name:	Cardboard panel Ponoko Cut RS Tectonic Exciter on axis loosely held vertical 1m.jpg
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ID:	1280737 Click image for larger version

Name:	Cardboard panel Ponoko Cut 25FHE-4 Exciter on axis loosely held vertical 1m.jpg
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  • Gary.M
    replied
    Following are some comprehensive tests of two materials with several exciters. Note the vertical axis is in 5dB steps, and the smoothing is 1/6th octave. This may look bumpier than you are used to, but it is a more accurate picture. All graphs from pink noise measured in REW with Calibrated UMIK-1 from Cross Spectrum Labs.

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  • Kornbread
    replied
    Originally posted by Shadetreehifi View Post
    As to the pink panther: louder for a given input and great transients, but I could never quite get over a slight background ringing in the human vocal range. Kind of like standing in a shower stall. The pink panther was three quarter thickness.
    Also I'm running these exciters with plenty of headroom. 225 watts per channel rms. The exciters are the Dayton thrusters.

    IMO, wood products, in general, seem to produce a more natural sound.

    I too found the ringing of the dense foam board bothering. It led to experiments with cardboard saturated with minwax lacquer <(think it was lacquer). That exciter also died, wasn't even able to get a decent set of measurements, let alone any listening. Out of frustration with short-lived exciters, I gave up on the project ... at least for a while.

    unbiasedsound, try it on a scrap piece first. If time allows tomorrow I'll try it and let you know.

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  • Unbiasedsound
    replied
    Originally posted by Shadetreehifi View Post
    As to the pink panther: louder for a given input and great transients, but I could never quite get over a slight background ringing in the human vocal range. Kind of like standing in a shower stall. The pink panther was three quarter thickness.
    Also I'm running these exciters with plenty of headroom. 225 watts per channel rms. The exciters are the Dayton thrusters.
    225 watts rms???? I didnt think a 40watt rms exciter could handle that much power, unless you are utilizing more then one exciter?

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  • Unbiasedsound
    replied
    Originally posted by Shadetreehifi View Post
    Just a single data point here: I tried glue doped pink panther and eighth inch birch luan doped with minwax wood hardener. Panels are 2x6 feet. The luan panels sound great to my ears. The tonal balance is very similar to my acoustic research ar4x speakers, but with great transients and speed. The low end is augmented by a pair of ar1 woofers crossed at 120. The huge dispersion is a game changer for me. No more agonizing over the perfect stereo image sweet spot like with my Maggies. The high end seems to extend roughly to 16k or so, but then so does my hearing... My theory is that the balsa-like core of the luan, once stiffened by the minwax is a good medium for the mid and highs. The midrange is more natural to my ears than the Maggies. Great fun experimenting with these. This luan is the zero formaldehyde variety if that matters...
    Good info, I might just try the birch luan doped with miniwax hardener.....Question, do you think the miniwax wood hardener can be applied to XPS or EPS without any corrosive effects?

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