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[Christian King]

Great topic, and there’s a lot of confusion floating around about IEM isolation, so let me clarify the physics first because it drives everything else. Passive isolation in IEMs is 100% about the acoustic seal between the ear tip and your canal—not any electronics—and the amount of isolation scales directly with seal quality, driver distance from the eardrum, and tip material. Foam tips generally beat silicone by 5–8 dB in the low-mid range because they expand to fill the canal geometry, which matters a lot in a noisy arena where you’re chasing footstep and reload cues. But here’s the part most people gloss over: because the driver sits 1–2 cm from your eardrum, you’re getting near-field direct drive, so the same 85 dB SPL reading at the eardrum represents significantly more

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