Unfortunately for our pocketbooks, AC1 & Hirsch are correct, AC cords do make a noticeble difference even without any type of power filtering. I am not speaking hypothetically, but from the school of been there done that, I have tried many cables in my own system. IMO all cables effect sound noticeably including:
- digital IC
- regular IC
- AC cords
- speaker cables
It is useless to throw around scientific specs, rationale, theories,
blind test etc......you must try in your own system, that is the bottom line. If you hear no difference be happy with your radio shack cables.
No need to spend mega bucks, you can get excellent AC cords
for $350 or less, ie BMI Eel, Acoustic Zen Tsunami, Analysis Plus
power oval and many more, try to find used. I have found a fantastic AC cord for $50 called Absolute power cord, currently backordered advertised at Audiogon site from GTT Audio.