A slinky spring toy stretched out and plucked once from the end, recorded with a zeppelin design labs cortado impedance-matched piezo contact microphone. The resulting recording is a classic spring-based sci-fi "laser sound" with a massive, lengthy, rumbling decay tail. This was recorded at 24 bit 96 khz. In addition to its use as a sound effect, this waveform works well inside a convolution reverb as an offbeat spring reverb impulse response, provided one has the processor power and ram to support a 2 minute 13 second convolution. The cortado's bass response is exceptionally large for a contact mic, so high pass filtering may be desired if used as an impulse response.
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