Rivera RockCrusher Recording, Power Attenuator and Load Box, all analog speaker emulation, 11-Band graphic Eq., natural tone balance at any level, selectable 8- and 16-Ohms capability, Reactive internal network for true amplifier/load interaction, high thermal capacity ensures cool running and long life, tight impedance tolerances, XLR and unbalanced line outputs with level control, Low- and high-frequency equalization selection, Load box and attenuator function up to 120W RMS capacity, Full bypass capability with no insertion loss, switches for Eq., Input level and speaker impedance