A differentially balanced design will yield a 6dB higher output than it will single-ended.
Single Ended vs Balanced Output Gain
I run an ARC Ref 3SE phono with VAC Sig Mkll SE pre and VAC Phi 200 monos; the gain in the phono is 6 dB less in Single Ended compared to Balanced; the pre specs show no difference in output gain Single Ended vs Balanced; the gain in the amps is 6 dB greater Single Ended compared to Balanced. Why the difference in output gain between the two? Is this typical on pre and amps that have both Single Ended and Balanced Outputs?