Recently purchased and installed a Zavfino Majestic power cord ($450) on my NAD C298 and the change was beyond WOW. I had been using Pangea and Audioquest (NRG4) and so there was a lot of room for improvement. But it was stark. Since I run two amps, I purchased a DH Labs Power Plus Cryo, which are about $80 less in price and will try that on the other amp when it gets here on Tuesday. Both power cords are 12 AWG.
If you do not want to spend that kind of money, I would suggest Audio Envy. I have the Ocean 3 ($190) on my preamp and am happy with it. Captain in Colorado is an astute audiophile and has far less overhead that allows for a better product at a reduced price.
Be aware that the Zavfino Majestic is a beast. You will need room to work it as it is fairly stiff and you should have at least 8 inches behind your gear as it does not bend and you should not force it to bend. I have heard the DH Labs products are not as stiff. Audio Envy power cords are very easily maneuvered between components and are really light in weight.
As others have stated here, reducing vibrations on all of your gear can also be a noticeable remedy and your bass issue may simply be placement, vibration, or room acoustics, or all of the above. There are many cheap way (DIY) to attend to theses issues like simply making your own platform out of wood and utilizing sorbo feat, Isocoustics brand feet, or even just hard rubber.