Ever since my last thread in the other sub-forum about S300 amp resting hiss, I started to do a little adventure on paying really close attention to noise and hiss. And today I found something quite interesting.
I have two systems sharing the same power strip (these are just normal GE power strip you buy from amazon, not audiophile). The power stripe connects a SONOS amp (the new 300w one they released recently) which powers a pair of Dynaudio speaker (let’s name it SONOS-D), and a PS Audio S300 amp which powers a pair of Paradigm speaker (let’s name it PS-P).
So here is the interesting, whenever I’m trying to switch songs in the SONOS app, the Paradigm speaker (PS-P)'s tweeter will have static hiss for 2-3 seconds before the song start. But the Dynaudio (SONOS-D) speaker is quiet and hiss free.
I’m very confused as how could the SONOS amp switching to play a new song causing static noise to speakers it’s not even powering?
A few other discovery
- The opposite is not true, meaning switching songs on the PS audio amp won’t affect the speakers the SONOS amp is powering.
- The static hiss has a unique pattern like zzz—zz-zz----zzz every single time, it’s the same pattern and feels like those signals you hear from telephone calls back then.
- The static noise exists even though the gains of these two amps are set to 0.
- The volume of the static noise does not change
As the SONOS amp uses AirPlay 2 to interact with my apps, would it possible this is AirPlay interfering with the tweeter?