Battery power amp has virtual earth point(+13v?). bi ampable with mains grounded amp?

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With a battery powered le monstre, will the virtual 0v point be at 13 or so volts with respect to ground?
If so do all source supplies and any bi amps have to come of this same battery to maintain this virtual ground through out? or as the batteries are floating will any earth ground in the system set the 0v point in between the batteries. Please help, I am having a logic failure.:scratch1:
 
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There is no interaction at all.

The ground symbol in your circuit will assume whatever voltage it is connected too externally... and if that is "genuine earth ground" as you call it then that is the "potential" it will assume.

So no problem :)
 
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