Synergy Audio WFO45.1D Slave Input Clips sooner than RCA input

Hi All,

I am working on a pair of WFO45.1D amps and have noticed something peculiar.

The client had the amps configured for bridged output, so I was testing the SLAVE INPUT as well as the typical RCA inputs.

I noticed that with the RCA INPUTS the amp starts clipping at 60V RMS, but when driving a signal into the SLAVE INPUT, the amp starts clipping at 44.7V RMS.

Can anyone explain this to me and is this normal?

I am seeing similar results on both amps.

Also what would be a good representation of this input section?
 

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I did want to report back that the input circuit limits the signal to the driver card, as evident by measuring the signal at the input side on R1.

At this point I am assuming that this is normal behavior for these amplifiers, essentially limiting the output on the slave amplifier.