The concept of Counter of the waves

The affair to have replaced the motor mounting parts in TOYOTA Caldina AZT241W revealed the direction of it's researching and developing. I didn't understand why the vibration canceller weight on every parts, 4 in total. Rubber material is interposed in the weight and sizes are different.
D4 motor and excellent trans-axle are mounted on the body through 4 mounting support parts, shape and construction differ each other.
I thought their constructions are so designed to play a simple buffer action physically, I have realized recently my simple imagination was not to the point.
The theory of the isolation structure utilizing some weight for vibration wavelength cancelling concept is popular in the building construction for the Earthquake countermeasure.
Exactly the same principle is introduced in the vehicle's axle designing, the weight of the motor and the trans-axle around 200 kg is mounted on the vehicle's body with vibration buffer effect and also they are utilized as the vibration cancelling weight following the upper concept.
The fact that the feeling of pushing up at rear portion also remarkably reduced after replacing motor mounts in Caldina, the change of compliance in the front motor mounting construction affected also on rear axle physical reaction at all.
Before the alliance with TOYOTA company, all the SUBARU vehicle had some tendency to be shaken even with small gap passing. After the affair, the way of front mounting heavy weight in SUBARU Boxer motor models were completely changed in different ways from long lasted conventional way, the taste of ride had been changed as a matter of fact.
Probably, sophisticated TOYOTA technology might have been introduced into SUBARU models by the different way of concept.
The taste of ride in the vehicle is dictated by the balance of compliance including vibration buffer effect, they should be balanced in the physical properties, tire & it's pressure distribution in combination with dumpers and axle spring, rubber compliance inserted between them and the total distortion of the body construction, etc.
The engineers in the researching and the developing division are making desperate efforts every day, struggling like bleeding, to establish this precise balance, because it acts so delicately on the human 5 senses.
There exists no easy occupation to go easily on Earth, don't you think?