Hi,
There's nothing wrong with upgrading to a mechanically more robust power cord, but if you think you're going to hear any audible differences, you'll be disappointed.
The whole point of a "power supply" section in an amplifier or receiver is to filter and transform (hence the name "transformer") the 117-volt, 60-Hz AC power from your wall outlet to the necessary voltages that power different stages in your amplifier, including the output stages that actually provide gain--enough voltage and current--to drive those inefficient speakers.
To add a secondary device--a so-called power conditioner--or high-priced IEC power cord on the AC line before the amplifier is absurd and redundant, unless you're getting RF (radio-frequency) interference through your AC line. Then there's a purpose to filters.
But selling "power conditioners" to naive consumers claiming that they will deliver audible improvements, treads perilously close to consumer fraud, in my opinion.
Of course, if you pay hundreds of dollars for a conditioner or IEC cord, and expect or anticipate hearing a difference, especially if you don't use instantaneous comparisons done blind, of course you'll think it sounds better--you want it to, and you've paid your hard-earned dollars, so of course you'll hang on to the fantasy that it's actually doing something. But if you challenge any of these manufacturers of such devices to do scientific, controlled double-blind comparisons of their conditioner or exotic cables with an A/B/X comparator, they'll always politely decline. . .
Save your money for good speakers, nicely designed electronics, and lots of great CDs and DVDs!
Regards,
