Then there is “Dynamic Noise Floor” as coined by Robert Koda – DNF. Not so much a noise but rather a gritty and shifting ghostly shadow, a clogging mush that is changing in a continuous and dynamic way yet somehow related to the music in a sickly fashion.
It stems from the music its self when passed thru a piece of electronics or system. It is the ultimate corrupter and its nature is a direct result of a multi fold of complex interactions occurring within the make up of the circuitry. It may manifest its self in transients, or perhaps decay. Specifically in every event and every moment of music. It is our opinion that DNF is the single greatest contributor to the inferior sound of a components that otherwise “measure” so well. DNF is perhaps the Achilles heal of modern electronics.
Much, if not all of the DNFs make up is spread across the time domain – An occurrence in the past effects the result of the near future. As you can imagine, the effect has catastrophic consequences on music replay!
Robert Koda realized the existence of a musically modulated and ever changing Dynamic Noise Floor decades ago.
He states in another interview
The measurement of a "dynamic noise floor" matters more but this is not easy to measure.