I have had my Spider V head for a little over a year, along with the matching 4x12 cab. Last night, I disconnected the cab and was using the head as a practice amp with the built-in speakers, and one of them appears to be blown. I live in an apartment, so have never had this amplifier at a high volume. I no longer have my purchase receipt. It appears to be a 4" 16-ohm speaker, but I cannot seem to find any online that match that I can use, and without my receipt, I don't think Line 6 will help me with warranty. Does anyone have any suggestions what I can do?