i bought an ampeg svt-410hlf cabinet about two years ago. about one year ago i started hearing some nasty distorting so i called up warranty and they replaced it with a brand new one. now my second one is distorting. even at low volumes i can hear an unwanted fuzz, it isn't really apparent but you can definitely hear it and even at louder volumes i can hear a sound like there is glass inside of the cabinet rattling (that is the only way i can think to describe it). i called the warranty today and they said they no longer replace equipment so i have to take it to my local guitar and electronics shop and have it repaired. the only problem is, my band plays shows about twice a week and we practice about 2 or 3 times a week. we have a show this saturday, a television appearance on monday, and then a huge city wide battle of the bands next saturday. either way i will be taking my cabinet into the shop to get it fixed but i was wondering if any of you had any ideas as to what is causing my problem so i can have some idea as to how long it will take to be fixed. my dad, who has played bass for over 40 years, thinks that it has to do with the horn circuitry. i always play with my horn off so i think i'm going to tell the shop, if that's even the problem, to just leave it unhooked or bypassed so i won't have to deal with it anymore. any input as to what's going on? i've already tested it with multiple cables and two different heads so i am positive it is the cabinet.