I had experience with other high end fuse like Hifi tuning fuse before which cost me around 40$. They worked with some slight sonic improvement of mid range and refined details. Before ordering Synergistic Research Blue fuse, I thought 150$ was too much for tiny fuse. But on the 30 day's return condition, I placed an order this Monday and it arrived this afternoon. I intend to return it unless it make substantial improvement over 40$ Hifi tuning fuse. But just after inserting the Blue fuse to Line Magnetic 508, the sound change drastically. It is like magic with more rounded mid, refined treble and fast rhythm out of my system. Now I am wondering how 150$ fuse makes so much improvement over my 100K system (new purchase price, 50K speakers, 12k Digital Equalizer, 9K DAC and more than 20k $ of cables). 18 years ago, dealer let me home audition 1.5K$ Synergistic Research power cable. I put it to DCS Elgar DAC and I could not take it out. The expensive power cable made already excellent DCS Elgar sound more transparent with heightened details. 1.5K$ 18years is worth more than 3K$ now. So the power cable was damn expensive but I did not have any other choice than to buy it. After 18 years, 150$ Synergistic Research fuse drove me crazy. This time the cost is not that much burden unless I buy more fuses.