Continuity between HU RCA's and common ground?

[headless 10+ year member]

I am trying to track down why I get noise out of my front (arc 4150xxk) speakers when my subwoofer amplifier (1500xxk) is playing.

I just tested both of my Arc amps - neither of them has any continuity measurable at all between their RCA shields and their chassis ground wires.

When i do the same check on my HU's RCA shields, I am reading a few ohms resistance.

Should I get a measurable resistance between the RCA shields of my HU and my chassis ground? Or should they be totally isolated?

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