Dtc, I suspect KN is using the high output version of the Platinum cartridge, which is spec'd at 5 mv under the standard test conditions. He would most likely be using, and have to use, the low gain setting of the phono stage with that cartridge, which apparently provides a gain of 40 db. That is a voltage gain of 100 times. So under the standard test conditions the phono stage will be putting out 0.5 volts.
Particularly high volume peaks on some recordings would no doubt put that into the 1 to 2 volt range, but many other recordings will be at levels that are considerably less than 0.5 volts most or all of the time.
The key questions to ask Grado, as I see it, would be what the gain of the headphone amplifier is, at the maximum setting of its volume control, and what its maximum output voltage is.
Best regards,
-- Al
Particularly high volume peaks on some recordings would no doubt put that into the 1 to 2 volt range, but many other recordings will be at levels that are considerably less than 0.5 volts most or all of the time.
The key questions to ask Grado, as I see it, would be what the gain of the headphone amplifier is, at the maximum setting of its volume control, and what its maximum output voltage is.
Best regards,
-- Al