Hi @eddiechanghk , just want to clarify a couple of points regarding “active” and “passive”, which could be confusing for you. As I understand, the Vibraplane belongs to a class called pneumatic vibration isolators. In general, this kind of isolators is considered as “passive” devices. What is confusing is that within this class of “passive” isolators, there are passive and active models, as explained by @sksos. For the Vibraplane, the terms active and passive models only refers to the method of levelling (automatic vs manual).
The Herzan and it’s kind are considered as “active” vibration isolators. They physically generate a counter force to cancel out the vibration, hence the term “active” !
These vibration isolators were originally used in scientific laboratories, eg. under electronic microscopes etc. The “active” devices like the Herzan are considered more technologically advanced, and have better isolation specifications. They are also more expensive, as you have noticed.
I have a couple of floor standing pneumatic anti-vibration tables under my turntables and can attest to their benefits. However, I have not compared them to “active” platforms, like the Herzan, in my own system, so can’t say whether they can be even better.
Hope this helps