RCF702 mk2 hi pass dsp noise concern

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Has anyone had an issue with a new RCF 702A sub whereby if I connect a top can via the built-in crossover, I get burbling background noise when there is no audio is connected but no volume applied? If
I switch over to simply by-pass (straight thru) then noise disappears. Hence it’s not coming from the audio source.
Thanks for any advice/experience 🙂
 
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