Your hookup is fine. The black one in the middle with 0 is ground. It takes some time for the unit to burn in. Let music play on it as much as possible for about 100hrs or so and then take another listen. You can then try the 4 ohm connection and see if you prefer the sound. It won't hurt the unit. You can also bring the amp to another level with upgrades. Jolida amp are a favorite of people that like to do mods or you can send it to Jolida and they can change the caps and perform their mod. I would first give it time to properly break in and try some tube rolling. Also do some reading and make a decision after that what you would like to do. Good luck!
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