Slight Hum from subwoofer

I have my AJ Acoustics subwoofer wired into my Star via the speaker output and the High level inputs on the sub.
However I’m getting a very low hum on the sub, you can feel it on the speaker. Any ideas please.I’ve tried switching the earth switch on the Star,

Are you connecting from the terminals on the speakers or directly from the back of the Star?

From the back of the Star, Speakers too far away

That may be the problem. similar issues were reported here in the past with NAIT 5i users connecting that way. Changing to connection from the loudspeakers not only cured the humming but improved overal performance.

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