I would start with the DHC-3 on the power amp. And then play around with it in each component. . . but I think it may best serve the amp.

I purchased one DHC3. I was using DHC1 everywhere else.

I tried the DHC3 first on the amp, SE84UFO, and then I tried it on the CD player. I felt there were improvements both ways.

If I could only have only one DHC3 I'd probably place it with the amp. But once I heard it on the source, too, I suspected I had to have it on both amp and source. So I purchased another DHC3. I'm glad I did.

This is some of the best bang-for-buck improvement in my system. Improved detail on the instruments. Better overall sense of the soundstage. Better location within the soundstage. A surprising improvement in depth (and front/back location) in the soundstage.

THE DHC3 is heavier and stiffer than the DHC1, but I was able to replace all my DHC1 with DHC3. It's made a big difference, improved things in ways I didn't expect. I'm very happy I went for the upgrade to DHC3.