I think so.
I hope so.
I simplest terms, it's the audible noise or hissing sound you hear, instead of the music.
This is my experience.
Acurus RL-11 preamp & 200X3 amp - suppose to have SNR of -95dBA. With just the amp on, no hissing sound. But when the RL-11 was on, I heard hissing sounds.
Denon PM2000 - suppose to have SNR of > 107dB. But I heard hissing sound.
Denon's very first Pre-Pro (before the AVP-A1) - suppose to have SNR of 100dB. But I heard A LOT of hissing sound from the surround speakers.
Denon AVR-5308CI - measured SNR per Home Theater Mag to be -110dB. No hissing sounds.
I've read that the Parasound P3 preamp also has hissing sounds, but the Model 2100 preamp does not have hissing sound. The 2100 preamp has better SNR per spec.
I heard that Emotiva is pretty quiet - no hissing sounds at all.
Do you hear any hissing on your speakers?