Just a bit of fun.

I downloaded one of those free SPL apps on my telephone. I don't think they are that accurate but give a general idea.

With nothing playing I got a pretty constant 20dB.

With some 'Goldfrapp' playing (which is pretty chilled-out stuff) at a minimum level I was happy with for 'serious' listening it is showing 55dB at listening position, peaking at 70dB.

20dB is very low for background (a quiet room is around 30dB) so maybe that is down to the meter and it is registering 10db too low. It is pretty quiet most of the time round these parts though.

If you don't have it already the app is free and takes 10 seconds to select and download, please share your results.