I've read several articles, posts, etc. about bypassing the fuses in my Maggie 1.6QR's and getting a significant improvement in SQ. Bypassing the fuses always makes me a little uncomfortable! I had also heard that ceramic fuses give a good improvement in SQ. The problem was I couldn't find any in the 4A fast-blow size I needed for my maggies. A post on Audio Circles had a link to www.cryo-parts.com, and they had 4A fast-blow fuses that have been cryo treated. Now, on target rifle gun barrels cryo treating makes a nice improvement, however I hadn't ever considered it on fuses! I ordered a couple of sets and have been trying them out tonight. Very nice improvement! Much smoother top end and mids! I have swapped the fuses back and forth several times, and there is definetely an improvement. I also tried them on my Monitor 5's, and there was a little bit of improvement also. Anyone else tried these?