S/N ratio Balanced input vs. Unbalanced input


Hi, is it normal that signal to noise (S/N) ratio at rated output of balanced input (XLR) is lesser than unbalanced input (RCA) ?

eg. Accuphase E280 , S/N ratio balanced is 96dB, unbalanced is 107dB.

 

Also E280 , at preamp stage , dB gain : balanced/unbalanced to pre output is 18dB gain, power amp stage dB gain : 28dB, total of 46dB.

What about other integrated amplifiers specs for comparison ? 

S/N ratio (balanced) :

S/N ratio (unbalanced):

Preamp gain :

Poweramp gain: 

 

auronthas

If you hear noise with ear on the tweeter it is normal.  With my limited experience only some amps are completely noiseless.  Can you hear it from distance of 1m?

Can you hear it from distance of 1m?

@kijanki Nope, only audible at near field,  close to tweeter.

If this is not abnormal, then I am relief.

Auronthas - can you compare the hiss, changing to single ended input?

@o_holter since my Ares II manual stated only XLR or RCA can be connected at one time, I have tried RCA before, and I can hear the same hiss.

So its not the connections. And the hiss is constant, regardless of the volume level?

@o_holter yes, the hiss is constant, with no variance on volume, the hiss is there with power standby on my DAC Ares II , only it’s gone when I unplug the power cord