I bought this brand new through guitar center several years ago, it has served me faithfully with never any problems.
with this unit you can attenuate successfully your 100w amp into one or two cabs.
if you own a 100w amp, this is the solution for the ability to play at lower volume, for any situation.
an attenuator is a must.
Rivera has been offering this 2010, and in 17 years has not made any improvement to its design....its that good.
while some attenuators out there use 120v plug in power, the rock crusher is a plug in device between your amp and speaker, no external power needed.