Input sample rate 8kHz

Hi, I noticed there are two modes: Audio for 48kHz and Speech for 16kHz. Would the score be accurate if both the reference and degraded samples were at an 8kHz sample rate in speech mode?

I received this message when I attempted to use an 8kHz sample rate for both the reference and degraded samples.
[equivalent_rectangular_bandwidth.cc : 33] RAW: EquivalentRectangularBandwidth::MakeFilters high_freq >= (sample_rate / 2), for sample_rate=8000 high_freq=8000.000000. Falling back to (sample_rate / 2)

I'm unsure about the meaning of 'Use a wideband model (sensitive up to 8kHz) with voice activity detection.'
Thanks!