I know only one of these has been in for testing and I have read all the pertinent threads (or I think i have) I can not see why the one amplifier would be worth basically 2 times the cost. My Hypex amp has died for the third time (power suppliy at least for the first two times) and I am tired of having it repaired. Both amps use the same power modules and while one has two power supplies it also has Voltage Regulators and Op Amps running (from an email with Nord). The lower priced one seems reasonably priced, the other may still be but is the additional circuity necessary?