Thaum qhov hloov pauv tam sim no nkag mus rau hauv lub suab, cov hlau nplaum dhau los ua ib qho electromagnet. Cov kev taw qhia tam sim no hloov tas li, thiab cov electromagnet tseem txav mus los vim yog "kev txav ntawm lub zog ntawm cov hlau nplaum hauv qhov chaw sib nqus", ua rau cov ntawv hauv qab kom vibrate rov qab. Lub stereo muaj suab.
Cov hlau nplaum ntawm lub horn feem ntau suav nrog ferrite hlau nplaum thiab NdFeB hlau nplaum. Raws li daim ntawv thov, NdFeB hlau nplaum tau siv dav hauv cov khoom siv hluav taws xob, xws li hard disks, xov tooj ntawm tes, lub mloog pob ntseg thiab cov cuab yeej siv roj teeb. Lub suab nrov.