I had tried a tube under my amp but it was really lame. Never tried it elsewhere as I use Black Diamond shelving on top of vibrapods, with the components on cones pointing toward the shelf. However there are cones made of different materials which do sound different / more mellow than brass cones, for example the Polycrystal. Black Diamond also has #3 & #4 cones available which exhibit still different (softer) characteristics. Also be aware that you can 'tune' simply by varying your cone spacings by 1" at a time; wider apart is brighter than closer together. Your test results above motivate me to continue experimenting, so thanks much for sharing Sam.
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