500 Series Subharmonic Synthesizer, with 2 Subharmonic Frequency Bands and LED Metering
-Generates low frequency content one octave lower than the source audio
-Won't cloud your mids or highs, even at extreme settings
-Simple, intuitive design is easy to dial in
-Perfect for adding power to kick drums, or body to synthesizers
-Level indicator LEDs help prevent clipping
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These merchants probably sell this module. Huh?