Xa udlala umculo, kunzima ukugubungela zonke iibhendi zefrikhwensi ngesithethi esinye kuphela ngenxa yomthamo kunye nemida yesakhiwo sesithethi. Ukuba lonke ibhendi yefrikhwensi ithunyelwa ngqo kwi-tweeter, i-mid-frequency, kunye ne-woofer, "isignali engaphezulu" engaphandle kwempendulo yefrikhwensi yeyunithi iya kuchaphazela kakubi ukubuyiswa kwesignali kwibhendi yefrikhwensi eqhelekileyo, kwaye inokonakalisa i-tweeter kunye ne-mid-frequency. Ke ngoko, abayili kufuneka bahlule ibhendi yefrikhwensi yesandi ibe ngamacandelo aliqela kwaye basebenzise izithethi ezahlukeneyo ukudlala iibhendi zefrikhwensi ezahlukeneyo. Le yimvelaphi kunye nomsebenzi we-crossover.

Icri-ossoverikwayi "ingqondo" yesithethi, edlala indima ebalulekileyo kumgangatho wesandi. "Iingqondo" ezinqamlezayo kwisithethi se-amplifier zibalulekile kumgangatho wesandi. Isiphumo somsindo esivela kwi-amplifier yamandla. Kufuneka sicutshungulwe zizinto zesihluzo kwi-crossover ukuvumela imiqondiso yeefrikhwensi ezithile zeyunithi nganye ukuba idlule. Ke ngoko, kuphela ngokuyila ngokwesayensi nangokuqiqileyo i-crossover yesithethi apho iimpawu ezahlukeneyo zeeyunithi zesithethi zinokuguqulwa ngokufanelekileyo kwaye indibaniselwano yenziwe ngcono ukwenza izithethi. Khulula amandla aphezulu, wenze impendulo yefrikhwensi yebhendi nganye yefrikhwensi igudileyo kwaye isigaba somfanekiso wesandi sichaneke.

Ukususela kumgaqo osebenzayo, i-crossover yinethiwekhi yesihluzo eyenziwe zii-capacitors kunye nee-inductors. Itshaneli ye-treble idlulisa kuphela imiqondiso ye-high-frequency kwaye ivale imiqondiso ye-low-frequency; itshaneli ye-bass ichasene netshaneli ye-treble; itshaneli ephakathi sisihluzo se-band-pass esinokudlulisa kuphela i-frequency phakathi kwamanqaku amabini e-crossover, enye ephantsi nenye ephezulu.

Izinto ezikwi-passive crossover zenziwe yi-L/C/R, oko kukuthi, i-L inductor, i-C capacitor, kunye ne-R resistor. Phakathi kwazo, i-L inductance. Uphawu kukuvimba ii-frequency eziphezulu, logama nje ii-frequency ezisezantsi zidlula, ngoko ke ikwabizwa ngokuba yi-low-pass filter; iimpawu ze-C capacitor zichasene nje ne-inductance; i-R resistor ayinalo uphawu lwe-cutting frequency, kodwa ijoliswe kwiindawo ezithile ze-frequency kwaye Ibhendi ye-frequency isetyenziselwa ukulungisa, i-equalization curve, kunye nokwanda kunye nokuncipha kovakalelo.

Intsingiselo yeukunqamleza ngendlela engasebenziyo luluhlu lweesekethe ezininzi zesihluzi ezisebenzisa i-high-pass kunye ne-low-pass. Ii-crossovers ezingasebenziyo zibonakala zilula, zineendlela ezahlukeneyo zoyilo kunye neenkqubo zemveliso. Ziya kwenza i-crossover ivelise iziphumo ezahlukeneyo kwizithethi.