I replaced the normal fuses in my EA Benchmark DAC1 with a pair of Isoclean fuses.. It is more analog like now.. Smoother high and decay more naturally. Speed is fast with detail without feeling bright or harsh. The funny thing was, I didn't know my DAC1 has 2 fuses (one per each channel). I only bought one home and plan to give it a try. Then I realized it takes 2 fuses.. So I ended up plug it in for my left channel anyway.. Wow I noticed my left channel has faster speed and more decay longer with natural tone compared to my right channel.. I was convinced and right away, called my dealer to ship the second one... Isoclean is gold plated fuse with gold plated contact on each end.. I never try the the HIFI tuning fuse though.. I will try them on my new Spectron Musician 3SE amp pretty once I have break in process complete. !