a) I am playing in an acoustic environment, with fellows having classical education and acoustic instruments
They cannot tolerate 60 dB additional background noise.

b) When playing at home, 60 dB is too much in the evenings for neighbors and to me too

c) When using headphones 60 dB comes through easily to my ears

I have an old Hartke KickBack 10 combo (120 W). It has a possibility to switch between internal and external speaker.

When I switch to 8 ohm external speaker, as usual no noise at all. However I would like to use Hartke only, but it allows only one speaker to work with, 120 W power is a limit.

So parameter of silence is Hartke KickBack 10 connected to external 8ohm speaker. Resulting no noise at all. Or it cannot be heard.

What makes noise? It is a cooling fan solutions. And every 500/800/1000W bass head produces too much background noise.

B