Main stereo follow-up (not really head-fi, but fuse info nonetheless):
The IsoCleans are great with the Shanling monoblocks now after recalibrating the low-pass filter frequency of the sub to be at the minimum, eliminating minor lower midrange bloom. It had been moved up because of the DAC's bit of bias toward the upper end, leaving the lower midrange somewhat lacking. I also re oriented the speaker's toe-in back to pre-DAC levels, and the result of these two tweaks (really just back to where they had been for 5 years, pre-DAC) was near-perfection. The IsoCleans in the amps allow the detail and fast rise time of the DAC while still producing silky but unblurred mids and highs. My very critical audiophile friend who has followed my system since its inception came over Sunday and was stunned by the positive changes that made a good system even better.
So this is with the stock ceramic fuse in the Cullen DAC, as the IsoClean was not a good match there, and this DAC is identical to the one in my headphone rig. I still want to see if Furutechs might improve the sound some more. It is interesting that the IsoCleans clean the sound, especially the highs, in the amps and source, but brighten the sound in the DAC! One needs different fuses for different components and combinations of components, for sure. Unfortunately, we cannot try before we buy.
In the headphone rig, as mentioned in the earlier post, the IsoClean also worked very well in the Woo WA6.