This A6 is nice...MUCH quieter than the S7s, either one or two-fan. Hashing a steady 3.8.
Yeah I have one in my inside laundry in the centre of my place, pointing out the door, to heat the place (since it's cold)
My setting to make it 3.2THs and very quiet:
Edit /etc/init.d/cgminer
AVA4_OPTIONS=" --avalon4-fan $_fan-55 --avalon4-temp 75 --avalon4-voltage 8000 --avalon4-freq $_cf "
And:
Web freq 400 (was 450)
It allows the temp to be a little higher and sets the max fan lower
Since it's colder here that all works OK and makes it never spin the fans up to full.
I found with a 2nd one, that if it does get too hot, it stops hashing and the power drops right down.
The 2nd one (that is only half working) I tried with an almost silent fan and it would hash about half the time and averaged about 1THs
That one I leave off now.