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The Rivera RockCrusher Power Attenuator is a transparent load box/attenuator designed to work with tube amps at 8 or 16 ohms. The RockCrusher allows users to crank tube amps but attenuate the volume down for bedroom friendly levels. The RockCrusher also features balanced XLR and unbalanced 1/4" outputs to interface with recording gear for silent playing and recording.