Rivera RockCrusher Gold, Attenuator, Power reducer and load resistor for tube amplifiers, Load resistor and power reduction up to an amplifier power of 120 W RMS, Natural sound at any volume, Impedance: selectable between 8 and 16 ohms, Reactive internal circuit for real amplifier / load interaction, High heat capacity ensures cool operation and long life, Tight impedance tolerances, XLR and unbalanced line outputs with volume control, Bass and treble sound section selection, Full bypass without losses