Don’t go the fuse route. That isn’t your problem. That would be the last thing to upgrade when you have money to burn/throw away.
You can get better sound by connecting a good external DAC to the Z1. Also, I had the same Rotel that you have and wasn't impressed with the sound and sold it. That may not be your problem though as many people are very happy with it.
You can get better sound by connecting a good external DAC to the Z1. Also, I had the same Rotel that you have and wasn't impressed with the sound and sold it. That may not be your problem though as many people are very happy with it.