3.5mm male audio cable giving me electric shocks even when unplugged?

I have a Bose Lifestyle 18 home theatre system, and there's a 3.5mm to RCA (not sure if that's the word) L and R ports in the AUX output port on the back. It's been giving me electric shocks by touching the jack, even when the system is unplugged. The steel sides of my iPhone also shocked me when the 3.5mm jack was plugged in.

I'm using a step down transformer for the power.

You lost me at Bose. Don't get em wrong I loved my Bose OE headphones, and out of my 100+ collection of headphones, Bose is still in my top 10, but for anything else, Bose are complete pants.

As for your problem, maybe a power cord regulator of some sort, like the Monster MP HTS 1600

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