Here we go.... You either got it. Or, you don't. Your system will either allow you to hear such differences, or it will not. It could be your sense in hearing as well. Some people can not tune a musical instrument. Others have a keen sense for it. Let those who want to use fuses not have to have those not so gifted keep trying to discourage them from trying them. Go find something else to do and listen to your system as loud background music. The best fuse is having no fuse. Lately I have been finding passive preamps as my best friends. As long as you are playing with a DAC which has naturally higher outputs the need for premaplification becomes a moot point. Preamps were needed in the days of low output phono cartridges. Its how they got started. Fuses will effect the sound. If your system is transparent enough to let you know...