WIFI 2.4Ghz signal attenuation

Hi, is it possible to attenuate 2.4Ghz WIFI signal (coverage area) in a way different to Tx-Power adjustment? A way more universal than Tx-Power, because different STA devices differently react to same Tx-Power.

They may have different power "reactions" but the dBm is what matters.
So, Ignore the power and look at dBm?

Thanks for the prompt reply. Is it possible to adjust dBm from inside Openwrt not by adjusting Tx-Power?

When a router is approved by the FCC they are only allowed so much signal strength (dBm) at some distance I don't recall.

This is rated in dBm. It takes into account antenna efficiency, placement etc.

For example, because the raspberry Pi has such a trash antenna and radio the FCC allows 100mw to achieve 20dBm
So the universal equalizer is dBm.

TX power and dBm are inseparable at the device level. Just ignore power and focus on dBm.

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I'm going to get a little pedantic now because I figured this detail would just further confuse you:

The FCC actually measures ERP (effective radiated power) but it adds nothing more to what I said than being pedantic.

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