Im in independence, Missouri, about 30 miles east of KC.
I had never thought to gound the #5 terminal,but maybee the #0 or the 0Volt tap,i figured it would short the primary, but i will fuse it low and try it, then that would eliminate the 60/60. but i do run the power after the transformer through the EMI/RFI filter, before it hits the outlet.
And this is just for the sub, i still have one other dual coil transformer im using for the rest of the equipment, but the output on both seam to be a little high, around 126 at low to no load, im not sure what the tube stuff likes best, im sure the sub wont mind.
I have a currently unused variac installed and "was" using it to drop output to around 115, for the amp,tv,xbox etc.