This is a condition I coined to describe vibrations that don’t seem to reach the surface of a toy. Clitoral toys with buried vibration syndrome suck. For insertable toys, buried vibration syndrome can actually be an asset, because it prevents the toy from numbing my vagina. The best way I’ve seen this explained was in this article.
Power affects the pitch and noise level of a vibrator. The reason this can be a factor is because often manufacturers will do everything they can to make a vibrator quiet as that is how most customers prefer it. However, in doing so they must often add sound barriers that keep the vibrator from having the internal components vibrate. This will impact the level of sensation that one can feel on the surface of the vibrator and may reduce the power.