Why do 301`s and 401`s rumble?
They don`t. The main reason for rumble is poor quality plinth design, sorry to say this is the majority of plinth designs. When designed properly, rumble is either on the record or heard only at a volume dangerous to the ears or the equipment. Think of a motor car with no suspension, no sound proofing, no vibrating damping and poor rigidity. This is an analogy to what you typically have, most plinths were nothing more than an electrical safety cage – a cardboard box, would be no worse.
