Doug Schroeder Method, Double ic

Has anyone else lurking in the background done the Schroeder Method connections? 

I have seen only two mediocre results, and both of those seem to have been associated with headphone amps. I am unsure whether this would play a role in the less than impressive results obtained by others. 

I think it is entirely possible that the sound quality of the connection using Schroeder Method is of such high caliber that some headphone amps can't handle it. I wonder if there might be some signal saturation happening with headphone setups. 
I would encourage those who have tried it on headphone setups to try another combination using speakers, and see if there is a different result. 

Doug....I hate to say this, but my new cables are not doing the magic they did when new.   I have to investigate this more before saying more......I'll be back when I'm assured.

stringreen, I suspect your impressions are changing as you listen to it. 

Sorry I haven’t read all the posts but does this method require identical pairs of ICs between the two components or there’s still some improvements using different ICs? I have an extra pair of good ICs and some splitters that I can try but just wanted to ask. Thanks.