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I remember using Tripp Lite 12V inverters back in the 70s, before the car audio industry was producing anything larger than 24WPC.
The Crowns I was using, had ample filtering, but even being in the trunk, that noisy square wave, was still leaking into the system through the line level components.
The only point I'm even close to making, is that regardless of proper grounding, EMI may be entering through an unshielded wall wart, or other plastic component case.
Most filters may be capable of blocking 60HZ hum and ripple, but can't deal w/ the sharp transients of the higher frequency square waves. Or maybe at best, even not the newer modified sine waves.
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