Audiophilepure

https://www.stereophile.com/content/plinius-reference-150-power-amplifier

The right button, labeled “Class A,” is for choosing between class-A and class-AB operation. In class-A, the LED lights. If I forgot to switch to class-AB after a listening session, the amp’s “Ecologic Control” reverted to class-AB a half-hour after I departed. The rear panel includes two pairs of speaker binding posts to facilitate biwiring (footnote 5), and one set each of RCA and XLR input jacks. Between them lies the previously discussed “amplifier configuration selector.” A power toggle switch, 15A IEC connector, remote trigger socket (for integration into a home theater/multimedia system; I didn’t use it), and a ground-lift toggle switch complete the back-panel layout.

The ground-lift toggle switch has two positions: ground lift and chassis ground. States the manual, “In some installations a hum loop may exist due to duplicate ground paths from different equipment. Use this switch to remove the connection from 0V to ground thus allowing some flexibility in your particular set-up, although when using Balanced XLR inputs, the ground lift switch should always be set to ‘chassis.'” Through experimentation, I learned that if you don’t switch to “chassis” when using XLR cables, hum is present at levels impossible to ignore.

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