Noise Levels of Vibration Machines
The noise made by a vibration machine needs to be minimum for many reasons. (a) Who wants to hear a motor roaring near the ears all the time while exercising? It is terribly uncomfortable. (b) Often, the noise comes because of the walking machine phenomenon, in which the machine moves around the room while one takes exercises on it. (c) Also, even if the machine makes a loud hum all the time, you would not be able to watch TV, listen to music or do your thinking while taking vibration exercises. (d) Finally, you don't want your machine to bring your apartment neighbors to your apartment (say, the neighbor living in the floor below you), complaining about the unacceptable noise that you would end up generating.
Cheap parts
As my partner aptly puts it, the rattling of machines are because of "cheap parts". He is spot on. We have opened a ton of cheap $150-$250 machines, as well as ones that are more costly. The question that we wanted to answer is, why do some machines make so much rattling and noise, while other machines do not? And the knowledge that we have gained after opening up so many machines to see what's inside is, almost the entire noise can be attributed to cheap parts.
The fix to this is really simple - get a machine that costs more, but is free from noise. Otherwise, it will probably end up making so much noise (and that will keep increasing fast after the first few months) that you would simply run away from the machine. Your dollars will be wasted and the entire experience will be horrible. You want to use the machine for long, not for a few months. So better pay a bit higher upfront, and have comfort o use and peace of mind for a long number of years (many of these machines come with multiple years of warranties).
Weight of the machine
There is another reason of having a lot of noise: walking machine. If the machine is not heavy enough - as a rule of thumb if it is under 100 lbs - there is a significant chance that at the higher ends of the vibration range the machine will move ("walk") along the floor and cause a lot of noise. This will make life difficult for your neighbors and especially for people living a floor or two below your apartment. Preventing noise caused by the machine weight is simple: you need to get a machine that is, as a rule of thumb, heavier than 100 lbs.
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