Yeah they make a difference. My own epiphany happened when a group of audiobuddies were listening to a new CD player. One of the guys suggested switching in a new power cord he had brought along. In it went, and the rest of us just looked at each other -- it was that much of an improvement. I was strictly a power cord agnostic up until then.
I'll bet the OP's dog would have barked her head off.
I'll bet the OP's dog would have barked her head off.