I noticed on my 6600 that if I’m in Diversity Receive with no antennas connected, the noise floor between slice receivers is the same only if no pre amp or attenuation is applied. I suspect that the pre amp setting for the first slice receiver is not being applied to the second. This makes sense since characteristics between the two antennas will be different. However, there doesn’t seem to be any way to control the pre amp selection for the second diversity slice. Am I missing something obvious?