Hallelujah! I seem to have two working subs.

The only difference in the setup vs my original post is that the subs are set to max in Legacy Config Program and have stayed like that when I went back to check it after uploading - on re-reading Bayetta's posts I tried closing the windows back to the processor level before sending, maybe this made the difference.

I'll try calibrating it all over the next few days. Now is not the best time as it's late & my ears are full of water after a swim. The manual says to set the gain on the back of the subs to min - is this correct? I would have thought it would be set to max and the level set by the 568.

I would like to understand what all the options do in the sub menu - for example with one sub what is the difference between mono & centre, if set to LFE does music bass all go to the other speakers? Likewise what is happening with the three dual sub options.

568.2mm, DSP6000, DSP5200HC, DSP33 rears, HD621, LG G3, Sony UBPX800-M2, F80.