I am currently using the SR Blue, They are an improvement over the blacks. The best fuse I have tried are the Audio Magic Bees wax fuses. I have had such a high failure rate with them that I stopped using them and am hesitant to buy any more. Now Audio Magic has a "Super Fuse" costing $250,00 apiece. Too rich for my blood.. Anyone out there has tried these $250.00 fuses?