Power Cord Question

These adapters may be what you need.
http://www.takefiveaudio.com/mall/shopexd.asp?id=275#
Also available without cryogenic treatment though I haven't tried those.

Can these 3-prong power cords be used to plug into the rear of components having only 2-prong connectors in the rear without hurting anything or degrading the sound?

If the power cord female IEC connector fits the male connector on the equipment, go for it. Depending on the make-up of the power cord, that will determine the sound change of the equipment it will be used on for better or worse. As for the safety equipment grounding conductor, with-in the cord, it will work slightly as a shield beings it is connected only by the plug and wall receptacle it is plugged into.

My NAD C372 integrated amp has a two prong receptacle on the rear panel but the new power cords use a three prong female ends, thus my question. I find it strange that my audio components use detachable power cords with two prong receptacles: NAD C372 intagrated-amp, Marantz CC4001 CD changer and OPPO DV980H, but my LG LCD TV uses a three prong receptacle for its detachable power cord.

Many manufactures of audio equipment are building their equipment this way. Because of potential ground loop hum problems manufactures are using double insulated AC power wiring instead of having to use the safety equipment grounding method.

With doubled insulated AC power wiring the metal case of the equipment is floating and does not need the use of the safety equipment ground. Jmho eventually all audio equipment will be built this way.

To clarify, the receptacles on the back of my components look like and are in the same shape as the IEC type but are only of the two prong variety. I didn't realize there was such a two pronged beast until I just happened to look. Like I mentioned above, I was surprised that my TV has a three prong IEC receptacle but my audio components come with a two prong version. I am also familiar with the smaller figure eight type and C7 type plugs. I actually have an older CD player with the C7 type (flat on one side). According to Musicnoise in his above statement, the third prong of an IEC power cord is only a ground and shouldn't degrade the sound or cause any damage by making this connection in a two prong IEC styled receptacle with a three prong female end of a detachable power cord. Hey, this is nice to be surrounded by such knowledge!

A lot British companies make components with two prong iec connectors. They work perfectly fine with 3 prong powercords.
I had a arcam cd player made that way and played it for 6yrs. without any problems. If your house is properly wired, all of your outlets are grounded from the main box which makes it safe.

Yes, they will fit and work but will not be grounded. If the component doesn't have a third wire ground, it doesn't require one.