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Used Rivera Rock Crusher Power Attenuator / Load Box, Great condition, does not include box. Arizona Phoenix California Canoga Park Hollywood Hollywood Drums Ontario Mills Puente Hills San Diego Torrance Westminster Connecticut New HavenRivera Rockcrusher, Rivera's RockCrusher power attenuator and load box could be your gateway to epic tube-amp tonal bliss. The tone of a tube amp is directly related to the power of the signal it receives and how much amplification is added by the tubes themselves.Rivera RockCrusher Power Attenuator and Load Box | Reverb, The Rivera RockCrusher Power Attenuator and Load Box is a supremely useful tool for anyone with an awesome tube amp in their collection. This device fits between your head and cabinet, and allows you to control output levels and attenuation to keep your amp sounding its very best at whatever volume works for your specific gig or session.