Maximizer v. Limiter (v. Brickwall Limiter)?

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The thing that is causing this is certainly the ceiling speakers being 100 V speakers.
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??
I’m not even using speakers right now, just headphones?
I’m confused, the logic of a limiter is to limit, and it says it’s doing so in the plugin window, but there’s a peak signal when I add a Brickwall Limiter set to a 0dB threshold.