Be careful on the specific unit on the Torus, it seems (based on late night, tired reading) that the RM does not have SMSS, but the AVR does.
The RM does say it has surge supression, but series mode has better reliability and a noise filter that starts down around 2-3 kHz.
The RM does say it has surge supression, but series mode has better reliability and a noise filter that starts down around 2-3 kHz.