Umngane wami nomngane wami, uGeffrey Morrison, uye waqaphela kakhulu isikhathi sokubuyekeza kwakhe i-Bose QC-15 ngaphezulu-indlebe yokukhansela umsindo e-The Wirecutter kanye nekhanda le-Bose QC-20 ekhanda ku-Forbes. Abathengi be-Savvy bahlale befuna izinketho ezifanele kakhulu, abafundi abaningi bakaGeoff baye bacela ishadi lokulinganisa elifanisa umsebenzi wokukhansela umsindo we-Bose QC-15 ngokusezingeni eliphezulu ngokuhambisana ne-Bose QC-20. Njengoba kunikezwe ukuthandwa kwesicelo, ngacabanga ukuthi kuyoba usizo ukubeka ndawonye.
Ukuhlolwa kwenziwa nge-GRAS 43AG indlebe / itekisi simulator, ikhompyutha ephathekayo eqhuba isofthiwe ye-TrueRTA kanye nesikhombimsebenzisi somsindo we-M-Audio MobilePre USB. Bobabili i-Bose QC-15 ne-Bose QC-20 babalwa ngokusebenzisa isiteshi esifanele somsindo. Amafomu asetshenziselwe ukuhlolwa avela ku-20 Hz kuya kuma-20 kHz, okuyizinto ezivame ukukhiqizwa kwamadivayisi amaningi alalelwayo emakethe. Izinga ezingezansi kwe-75 dB zikhombisa ukunakekelwa komsindo wangaphandle (okungukuthi, 65 dB eshadini kusho ukunciphisa -10 dB emisindeni engaphandle kuleyo mvamisa yemisindo).
Ikhefu lokuzihlukanisa le-Bose QC-15 likhonjiswa ngendlela eluhlaza, kuyilapho i-Bose QC-20 iboniswa emlandweni obomvu. Ngakho-ke njengoba ubheka isithombe, qonda ukuthi ukwehla komugqa eshadini, kungcono ukukhansela umsindo wenkundla ethile yemvamisa.
Uma kuziwa kwi "jet injini band" phakathi kwama-Hz angu-80 no-300 Hz, i-Bose QC-20 iphakeme kakhulu - okungaphezu kuka-23 dB okungcono - ku-QC-15. Lokhu kusho ukuthi ukwakhiwa kwezindlebe ze-Bose QC-20 kuphumelela kakhulu ekunciphiseni izingoma ezijulile ze-droning / humming, njengalabo abavela ezinjini zezindiza. Leli banga lobubanzi lihlanganisa ukuphela okuphansi kwenkulumo yomuntu evamile (amazwi omuntu ikakhulukazi), okungenza iBose QC-20 ihleleke kulabo abafuna ukuvimba izingxoxo eziseduze.
Kodwa-ke, i-Bose QC-15 ephezulu-inhlobonhlobo iphuma ku-QC-20 ngezikhathi eziphakathi kuka-300-800 Hz nangaphezulu kuka-2 kHz. Lokhu kusikisela ukuthi i-Bose QC-15 ikwazi kakhulu ukuzulazula umsindo ophakeme, njengamafomu okuxoshwa okuvela ekushiseni noma ohlelweni lwe-air conditioning ezindizeni. Lezi zigaba zamagundane nazo zihlanganisa ukuphela kokuphakathi kwenkulumo yomuntu, nakuba kungaphezu kuka-2 kHz kungenzeka kube eceleni kwemigqa yabantu (isib. Izingane ezincane) ukucula noma izinja ezihambayo.
Ukukhetha phakathi kwe-Bose QC-20 ne-QC-15 kungase kuxhomeke ekuthandweni kwesitayela / ukuphathekayo (ngaphakathi-endlebeni kuya phezulu-indlebe) kanye nokuthi ubani uhlela ukuyisebenzisa. Kungaba nzima ukusho ukuthi ubani ozokwenza umsebenzi ongcono wokunqamula ingxoxo yomculo nengemuva e-Starbucks, okungenani ngokubuka kuphela izilinganiso.