Hi all, Maybe one for Arcam or an avid 3-Channel P-25 user... On the back of my Three-Channel Arcam P25 power amp, I have a switch (for L and R channel and a separate one for the C channel) called GAIN, which has settings for both 'Normal' and 'Low'. In the P-25 manual, the 'Low' setting has some relevance to specialised Home Theatre set-up. I am currently using 'Low' as this levels out nicely when calibrating my speakers with test tones and an SPL. The High setting seems to have me reducing my pre-amp output by 3 - 4 db for the L, R and C channels. The question is, what is this for (why have a gain button anyway?) and is this general practise to have this set to 'low' when using it with a HT set-up.