XA30.5 single ended connection

Hi,

how much do I lose when running the Pass XA30.5 unbalanced (single ended)compared to balanced?
I have a source (Dac) which is single ended but offers xlr outputs.
Over here in Germany I remember a review which says the XA30.5 should be run balanced.If run single ended the sound would decrease quite significantly.
Is this true?
Has anyone compared this amp driven either way?

Thanks.