Schneckschwingungen

Schneckschwingungen, also known as snail vibrations, is a term used in acoustics to describe a specific type of resonance or feedback phenomenon that can occur in certain audio systems, particularly those involving vacuum tubes. It is characterized by a self-sustaining oscillation that often manifests as a buzzing or ringing sound, typically at a low frequency. The name "Schneckschwingungen" is German for "snail vibrations," evoking the slow, drawn-out nature of the sound.

This phenomenon arises from an interaction between the amplifier's internal components, particularly the output transformer and the speaker. When the amplifier is driven to certain frequencies, especially those related to the resonant frequency of the speaker cone or the inductance of the transformer, a positive feedback loop can be established. This loop amplifies the signal at that specific frequency, leading to the audible vibration. Factors such as component quality, circuit design, and even physical placement of components can influence the likelihood and severity of Schneckschwingungen.

While often considered undesirable, some audiophiles have attempted to harness or even accentuate aspects of this effect in specific contexts, though it is generally viewed as a distortion or malfunction. Addressing Schneckschwingungen typically involves damping resonances, improving component isolation, or modifying the amplifier's circuit to reduce the propensity for positive feedback at these critical frequencies.