Martin Schunk总裁的回信来了，先贴英文的：
Are you sure that the gain of its output is the same? Even when it is
written that the gain is the same, you will always have a difference because
components can vary from e.g. -10% to +10% of the announced value. Sometimes
it is a combination of the output resistance of the Preamp or DAC and the
input restistance of the amplifier who can reduce the gain.
When you look at the specs of your manual you will find that the input
resistance of a unbalanced input is 50kohms and the balanced is 2 x 20
kohms. When you connect a certain DAC or Preamp it can be that the
unbalanced sounds a little bit louder. Another point is e.g. the
restistance/ impendace of your cables etc. A balanced cable is different to
an unbalanced. So, the combination of different things is the cause of
different loudness. But this dosen't mean that the sound performance isn't
so good than the unbalanced!
This difference can always be happen when different units from different
brands will be connected. So, don't care about that - just listen to the
great sound of your units....
I hope I could helps you...
Best regards from Germany,
Martin
