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Nord and soon Apollon are offering Hypex Ncore NC500 custom input buffers that use the Sparkos SS2590 Pro opamps and I am blown away. The Hattor uses their own input buffer with no upgrade options. I was using the Nord with the Sparkos regs and opamps ( SS3602) and the SS2590 was a considerable upgrade. I actually did not think that it could get any better but it did. Lower noise. Finer low level detail and better bass slam.