What is a good AC cord for M-L Aerius i's?

I recently purchased a Harmonic Tech AC-11 power cord for my amp, an Aragon 4004 mkII. The improvement in sound was almost unbelievable; deeper bass, blacker background, better control over sonic decay, cleaner and more detailed. I was wondering if the HT AC11 or any other power cable might give more of the same type of improvement attached to my speakers.
The only reason I have not purchased more AC 11's is I am thinking that maybe some other cables might interact better with electrostatics. A response from Anyone with a similar personal experience or wisdom on the subject would be greatly appreciated.
Thanks in advance.