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BlackSam, are those powered speakers? Do they have their own amplifier built in? If they don't, you need to put an amp between your pre-amp and speakers. That's why it's called a "pre-amp". :)
The Mictrophono pp400 is a preamp, and the YU5s are powered.
Do you know what levels are coming out of the PP400? And do you have any measuring tools or other devices to test if there is any sound coming out of the Aune at all when connected via the PP400?
It must be something simple if both work individually. I'd use a multi-meter (or hand held oscilloscope) and figure out where the dead end is. You might be triggering Aune's overprotection circuit if the levels are too high out of the PP400 also.