@kijanki Thanks for pointing out. I hope so.
But, when i checked the previous model E270, the S/N ratio for balanced input is 91dB, unbalanced input (high level input) is 108dB.
I am confused.
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:
@kijanki Thanks for pointing out. I hope so. But, when i checked the previous model E270, the S/N ratio for balanced input is 91dB, unbalanced input (high level input) is 108dB. I am confused. |
@kijanki I just check E270 vs E260 technical paper, E270 noise voltage is 35microV at -30dB volume position But in the above E280 technical paper, E270 noise voltage is 41 microV. I am more confused now. |
@kijanki the reason I ask is I can hear noise (hiss) from tweeters when my balanced input (Denafrip Ares II) is connected while music is stopped playing. Volume changing not affected the hiss sound. |
@kijanki Nope, only audible at near field, close to tweeter. If this is not abnormal, then I am relief.
@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. |
@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 |
@o_holter Ya, I tried my old Sony CD player which connect to integrated amplifier via RCA, I did not notice any hiss near tweeter. I will do fast "switching" from balanced input (Ares II DAC) and RCA input (Sony CD player) to test the hiss noise.
@westcoastaudiophile my audio equipment are connected to a good power conditioner of Novaris brand. I would think EMI issue shall not be the case, wouldn't it ? |
@atmasphere What you said make sense. I will leave it if this not a defect, just not perfect. Thanks |