
dröhnen
to drone
To produce a loud, deep, vibrating sound that fills a room or environment.
Die Bässe aus der Musikanlage dröhnten durch das ganze Haus.
The bass from the sound system droned through the whole house.
to drone / to throb
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to drone
To produce a loud, deep, vibrating sound that fills a room or environment.
Die Bässe aus der Musikanlage dröhnten durch das ganze Haus.
The bass from the sound system droned through the whole house.

to throb
To have an unpleasant, dull sensation in the head or ears, often as a result of noise, exertion, or illness.
Nach dem lauten Konzert dröhnte mir der Kopf.
After the loud concert, my head was throbbing.
When 'dröhnen' (to throb) describes a sensation in the head or ears, a dative construction is used. The person who has the sensation is in the dative, and the body part is the subject.
Von der lauten Musik dröhnen mir die Ohren.
My ears are throbbing from the loud music.
You can easily distinguish the two meanings: If the subject is a source of noise, such as 'Musik' (music) or 'Motoren' (engines), it is about a sound. If the subject is a body part, such as 'der Kopf' (the head), and a person is in the dative ('mir' = to me/for me), it is about a sensation.
Die Lautsprecher auf dem Festival dröhnten bis in die Nacht.
The speakers at the festival droned late into the night.
Typical subjects for 'dröhnen' (to drone) are things that produce deep, loud, and often vibrating sounds. These include 'Bässe' (bass), 'Musik' (music), 'Motoren' (engines), 'Maschinen' (machines), or 'Lautsprecher' (speakers).
Im Keller dröhnte der Heizkessel.
The boiler was droning in the basement.
to throb / to insist
For headaches, pochen describes a rhythmic, pulsating pain. Dröhnen, by contrast, describes an unpleasant, dull sensation in the head or ears, often after noise or exertion. The type of sensation determines which word to use.

Nach dem lauten Konzert dröhnte ihr Kopf noch mehrere Stunden.
After the loud concert, her head continued to pound for several hours.
Während der Migräne pochte der Schmerz im Kopf im Takt ihres Pulses.
During the migraine, the pain in her head throbbed in time with her pulse.