As a rule, the most "bang for a buck" is instalation of dedicated power lines. Next, is power cord and finally, power conditioner. For ARC 100 try Marigo Ultra II or muchbetter Electraglide COPPER (not silver) Fatboy.
Power cord or conditioner for ARC VT100?
I have an ARC VT100MkII with the stock power cord that I'm plugging directly into the wall....I would like to get a power conditioner with surge suppression, & am also considering a power cord upgrade. Any advice? Two other factors: I'm using a Power Foundation III for my source components & preamp (which has no surge supression). Also, my outlets (older house) are not grounded. Any advice would be appreciated! Thanks....