I live in an apt so cannot make any changes to existing circuits.

I read that a 15A circuit should suffice for 770/990 combo, provided that 770 runs on its dedicated 15A.

BUT, like I said, I live in an apt and the best case is if I run an extension from the kitchen - where the sole 20A circuit outlet resides - into the living room. The cord will be about 20 ft long.

Even then, the 770/990 will have to be on the same circuit.

This leads to my question - would this setup even work?

1) Running a 20-ft extension from a 20A outlet.
2) Running all HT equipment (990/770/plasma) from it, aside from subwoofer.

Much thanks.