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Sounds like tire harmonics to me and not air suspension. When wide or low profile tires or highly inflated tires at speed roll over multiple road imperfections. But since you've ruled out tire pressure, not sure what it is but I'm the type to refrain from conjecture until diagnosed.
My air suspension is quiet on the road and running run flats.
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Current BMWs - '20 X5 xDrive40i M Sport, '20 BMW M550i | Past BMWs - '03 E39 540iT M Sport, '06 E53 4.8is, '11 E70 M Sport LCI
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