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This is the Speaker Cranker from EarthQuaker Devices. The Speaker Cranker a discrete, all-analog distortion enhancement device (i.e. not a booster) designed to give your signal some extra grit and a slight boost without drastically altering your tone. It's the equivalent of adding an extra preamp tube to your amp. It's perfect for adding more overdrive without adding volume, while still keeping and amp-like response and attack.
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