the audio PEMF is highly questionable that it would work. for a PEMF to work properly you need "pulsing" of EMF, and not audio that is always on.
the owner of http://www.diypemf.com/ did not know what his doing. obviously he lacks electronics background. and yet due to hallucinative meditation of his, one day he said, that he got this sudden inspiration that he can DIY a PEMF. what a woo. my god save us from this kind of people.
Have you looked into ICES? the inventor of it, is the scientist himself, the sole researcher for the PEMF NASA.