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In the Forum: Horn-Loaded Speakers
In the Thread: Deep End DIY - Australian take one Macondo.
Post Subject: The melaminePosted by anthony on: 9/3/2017
As it so happens I have some melamine here and I cut up 5 x 1" thick discs and pushed them into the middle of the tube (I also trialled 1 disc and 4 discs) and while they removed the resonance they did the same thing as the high density fibreglass batts in that they created impedance wiggles from about 100Hz+.  These impedance wiggles transferred into SPL wiggles and I doubt that they will be a good result.  Also, the closed cell and hardness of the melamine seemed less effective than the other stuffings at absorbing frequencies over 200Hz, but I am glad that I tried it.

Based on my measurements thus far, GreenStuf R1.5 Wall Batts (a low density polyester fibre) placed at the midpoint of the tube seem to do the best job at providing a smooth impedance and frequency response in the 100Hz+ region whilst also eliminating the tube resonance, so that is the direction in which I intend to pursue.

Thanks for your help Josh.

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