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:

auronthas07-08-2022 1:12am

kijanki Details Discussions Posts This discussion Message User 4,413 posts 07-08-2022 at 01:51am Copy Comment URL Report Comment Edit Delete It has to be typo. On page 5 of their technical paper they show 107dB for BAL-CD input.
kijanki Details Discussions Posts This discussion Message User 4,413 posts 07-08-2022 at 05:59am Copy Comment URL Report Comment Edit Delete I am confused as well. Balanced input suppresses common mode noise, but S/N measurements were taken with inputs shorted. I don't see any reason why balanced should be worse, assuming similar input level.
kijanki Details Discussions Posts This discussion Message User 4,413 posts 07-08-2022 at 07:56am Copy Comment URL Report Comment Edit Delete 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?
kijanki Details Discussions Posts This discussion Message User 4,413 posts 07-09-2022 at 08:14pm Copy Comment URL Report Comment Edit Delete If hiss comes from the DAC and is independent of the volume pot, then likely DAC is injecting some electrical noise into amplifier. I wouldn't worry about it, since not too many amps are completely quiet with the ear on the tweeter.