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These are relatively flat up to 1kHz, but above 1kHz, the rolloff is substantial. ~20dB reduction under 1kHz, up to 32dB reduction at 2kHz - 4kHz. These will definitely provide an appreciable level of protection in a situation where you’re not concerned about acute hearing damage (anywhere where most people are not wearing hearing protection), but these cannot compete with higher-end high-fidelity/flat in-ear hearing protection plugs and they are about 50-75x more expensive than foam disposables that will be more effective and only slightly less flat. For $18, you can’t go too wrong, but don’t expect these to keep up with a professional product or blow away expectations compared to a disposable.
Do you know any good higher-end brands?
Human hearing is subject to the Fletcher-Munson loudness curve. Our hearing is most sensitive in the range from 2khz to 4khz. And falls off rapidly moving toward the lower frequencies. In order for you to hear flat with earplugs. You actually want an earplug with less attenuation of high and low, more attenuation of midrange.