Good to know - thanks for the info!Plugged in with AC power on all the time.
Use the switch on the front of the amplifier to turn it "on" and "off".
Not the best plan.
When you turn off the AC power to the "brick", the DC rail in the brick and in the amplifier will drain to 0 volts in about a minute.
Then when you turn the AC back on there is a huge inrush of current trying first to get the power supply started up, then to charge that DC rail in both the brick and the amplifier back up to 32 volts (or whatever other voltage you are using). Given that the brick probably has about 470uf caps and the amplifier has 2200uf that current surge can hit 10 amps for about a quarter second then tapering off until those big capacitors are charged. This puts a very heavy load on the power supply during that start up phase and eventually it will kill it.
The front panel switch on the amplifier is arranged to avoid that. When you turn the amplifier "off" all you are really doing is shutting down the TPA3255 chip. Those big caps are still connected to a live power supply so they are constantly charged and ready to go. No more big rushes of current to start them up. Your power supply will last years longer.
All the hints for this are there ... no power switch on the supply, standby switch on the amp, pilot led on the supply... etc. It is clear it is intended to be plugged in, connected to the amplifier and left on all the time.
When "off" the amplifier draws about 20ma of current ... less than an LED night light, so it's not like you're saving any real power.