Frequency/HZ usually only matters with AC motors but Krell US amps run on 120V/60HZ.
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The older Krell amps (I have a KSA-250) can easily be switched between 100V up to 240V (there are 3 internal jumpers to set) and will operate on 50Hz or 60Hz. This is not true of the newer Krell amps which have a power input frequency sensing circuit and will not operate if you try to run a 60Hz amp on 50Hz power supply and vice versa. You need to have Krell, or their agent, convert the amps from one power system to the other. Another option is to buy a power regenerator, albeit a very high capacity one, and use this to convert from your local power voltage/frequency to the power/frequency setting of the amp. See my previous post on this topic.