Tvad, It would be interesting to compare the performance of the Apex footers with the IsoAcoustics to see how much improvement there might be with such a high end product. The IsoAcoustic footers made such a difference, it's hard to imagine getting even more performance out of such a simple concept as reducing vibration. I'm still awaiting the special 1/2"-13 studs needed to install the recently arrived IsoAcoustic Gaia feet on my speakers to get the full effect of having their footers under all components. You're fortunate to have those Apexs.
Geoffkait, following your suggestion I considered taking all my books
outside and starting a good-sized bonfire with them. I bet you nobody's ever thought of doing that before.
Williewonka, I will have to play around with the placement of the IsoAcoustic footers under each component as your second link suggested. The first linked described exactly how I set up my current shelving using non-slip shelf liner under a floating shelf, so maybe I did something right there. I'll try some of those blocks you and Millercarbon suggest under the wires.
Any suggestions by anybody about what your most effective tweaks have been would be appreciated. Thanks,
Mike