cones are going to couple the speakers to your desk, and they really won't do anything to fix your problem. likewise, herbie's footers have a pretty high resonant frequency (by design... they're intended to damp microharmonic vibrations) and they would again act to couple the speakers to the desk for vibrations below that resonant frequency. (i'm not trying to attack his product, i think it's a great one in fact and i'm sure steve would agree with my assessment in this application.)
what you need is something soft and squishy, with a very low resonant frequency. i make footers that would work well for this application (pandathumbaudio.com), but vibrapods would work just fine and so would something like a small deflated innertube. you might even try a roller bearing device, as it will decouple the speaker from the desk for vibrations in the horizontal plane.
of course, everything i suggested will cause bass attenuation... but there's really no easy way around that if you want to isolate your desk from the low-frequency vibrations. there's no way around newton's second, after all.
-Gary
what you need is something soft and squishy, with a very low resonant frequency. i make footers that would work well for this application (pandathumbaudio.com), but vibrapods would work just fine and so would something like a small deflated innertube. you might even try a roller bearing device, as it will decouple the speaker from the desk for vibrations in the horizontal plane.
of course, everything i suggested will cause bass attenuation... but there's really no easy way around that if you want to isolate your desk from the low-frequency vibrations. there's no way around newton's second, after all.
-Gary