blinddrew wrote:Just got to this bit of the magazine today, and looking at the picture of the shockmount, it looks like it moves in the wrong plane?
It would appear so, yes.
Surely you want your shock mount to have movement/elasticity in the plane of the diaphragm rather than perpendicular to it?
Oriented in the same plane as the diaphragm's natural movement, yes. Absolutely.
The Rycote Invision shockmounts for small-diaphragm pencil mics demonstrate the principle very clearly. The idea is to provide maximum compliance in the direction in which the diaphragm normally moves, so that vibrations through the mount don't cause the diaphragm to move (and thus generate an unwanted output). Vertical or side-to-side movements won't (directly) cause the diaphragm to move in and out, and so won't generate an output. So the lyres on the InVision mount allow easy fore-aft movement, but are relatively stiff in the other planes.
In the case of large diaphragm mics, the mounting options aren't as obvious, but again, the Rycote Studio InVision demonstrates one effective solution, with multiple lyres to provide the right degree of compliance in the right plane.
It would appear that the Samar mount a provides some level of up-down isolation -- a direction which shouldn't generate an output from the mic at all -- but not fore-aft movement, which will.
Or is the shock mount really not working in the way that it looks like it does? :?:
Only vibration test-bed measurements would identify whether it works effectively or not. I haven't tested or used it myself, so I can't comment on its actual effectiveness.
But by way of discussion around the topic, the other issue to bear in mind is that vibration has a habit of crossing the planes as it passes through a capsule's mounting arrangements. So a vertical input can often translate into a horizontal component (and vice versa). So if a mic happens to be sensitive to that kind of translation, introducing a shockmount that reduces vertical vibration might well appear to improve the situation to some extent... even though it's only dealing with a part of the problem.
In my (somewhat limited) experience, very few generic shock mounts provide any effective vibration isolation at all. And of those that do work as intended, their isolation frequency range is inherently restricted. Shock-mounting is an extremely difficult thing to do and the perfect shock-mount doesn't -- and probably couldn't -- exist! But there are a few that really are designed, engineered, and genuinely tested to ensure they work as intended.
I have tested several shock mount designs myself, and been present to observe more elaborate testing of many others on bespoke vibration test beds. It's actually quite shocking -- pun intended -- to see how poor some are, and some actually amplify the vibrational input in the audio range to quite frightening degrees!