Muse Coils "Elysium" clip-on filters

I have two of these on each of my amp's speaker cable posts. Great filters!  Lots more air and fine details revealed.  I've had them in my system for about 10 months and have tried them clipped onto various chassis screws and ground posts upstream from the amp, and the effect is good, but they are most effective as a speaker filter at the end of the signal chain.