60A main fuse burned, what do ???

Well, I’m really excited about my new Peerless Woofer, but my power amplifier is now pulling so much current over my 25mm2 cable that today, during a low bass test, the main fuse in the cable was fired just behind the battery. I slowly increased the woofer level at high volume and from a certain punk it just didn’t get louder. Still a bit higher and then everything was quiet. n secured with 4x20A. What do you do there? Larger fuses are only available as flat fuses and I would have to remodel them first laboriously. In the cold, I don’t have a cock for that. Can you order normal round fuses over 60A (thought so at 100A) somewhere? Greetings Andy