The new design was to eliminate ground loops.
452/601/1.2KW all have balanced outs.
Pin 1 on the XLR output of the 1.2KW is chassis ground.
Pin 1 on the XLR output of the new design is electrical ground.
Will experiment with the amp/subs this weekend and see how it works out.
http://audioaficionado.org/jl-audio/...tml#post128546
http://audioaficionado.org/jl-audio/...tml#post128969