The DAC4800A and Cherry amplifiers are "switching amps", so technically, the internal slew rate is that of the output stage (about 7200V/uS). The output filter of the amp removes the switching wave and yields an output slew rate of about 20V/uS (with an 8 ohm load). This is a respectable number, but keep in mind that it is limited by the output filter and increases as load impedance goes down.
The frequency response goes up to 60KHz on the DAC4800A and Cherry amps. This is a more valuable number than slew rate to many.
The sound of these amps can't be summed up with measurements (even though they are excellent) since they are designed from the ground up to deliver the best in music reproduction, not just test results in a lab.
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