I run Z1000's in parallel on all 4 channels of my TIU and use a single inline fuse for each pair. The only problem I had was that some are wired opposite inside making them out of phase with each other. The breakers would kick as soon as you connect the barrel jacks together. I eventually found 8 that were all the same. I did not want to mess with cutting the barrel jacks off to achieve getting them phased alike.
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