http://www.aaudioimports.com/ShowProduct.asp?hProduct=37 As is stated in the peer-reviewed marketing materials, these are "audiophile quality" so I had to check them out. I demand no compromise in all my gear, so once I found out they were space-age slow blow fuses - for the best quality sound - I had to buy over 9000 of them. And is typical for well designed fuses of this caliber, they can add powerful and deep lows as well as shimmering highs to your sound. Details AND transparency - at the SAME TIME! I've started to replace each fuse before every gig to create an airy and spacious sound stage for my listeners.