Check your manual or pull the fuses out and look at them.The values and type should be on them.By all means,replace them with the same type and value.I'm pretty sure you could find the info on the internet with a little searching.I changed the mains fuse in my Rogue and did not notice any change in the sound.This is something you have to try for yourself,no one can give you a definitive answer.You said the mfrs. did not respond,was this communication thru email?Sometimes it takes a few days for companies to answer email,why not call them.Good luck.