Umhlobo wam kunye naye, uGeoff Morrison, uye wafumana ingqwalasela eninzi ngexesha lokujonga kwakhe i-Bose QC-15 engaphezulu kwendlebe-ukukhansela i-headphone kwi-Wirecutter kunye ne-Bose QC-20 in-ear ear-annelling headphone kwiForbes. Abasebenzisi be-Savvy bahlala bekhangela iindlela ezifanelekileyo ezifanelekileyo, abafundi abaninzi beGeffers baye bacela isatifiketi esilinganisa umsebenzi wokukhansela umsindo we-Bose QC-15 ngokumalunga ne-ear-Bose QC-20. Ngenxa yokuthandwa kwesicelo, ndacinga ukuba kuya kuba luncedo ukubeka ndawonye.
Uvavanyo lwaluqhutyelwa nge-GRAS 43AG indlebe / itekisi isimulator, ikhomputha yekhompyutheni esebenzisa isofthiwe ye-TrueRTA kunye nomboniso womsindo we-M-Audio MobilePre. Bobabini i-Bose QC-15 kunye ne-Bose QC-20 babalwa ngokusebenzisa iseshini sokula. Iimfono eziqeshwe ukuhlolwa zivela kwi-20 Hz ukuya kwi-20 kHz, eyona mveliso eqhelekileyo kwizixhobo ezininzi zomsindo kwimarike. Amanqanaba angaphantsi kwe-75 dB abonisa ukunyanzelwa kwengxolo engaphandle (okt, i-65 dB kwitshathi kuthetha ukunciphisa -10 dB kwizandi ezingaphandle kweso sandi).
Ikhefu lokuhlukanisa i-Bose QC-15 iboniswa ngoluhlu oluhlaza, ngelixa i-Bose QC-20 iboniswa kumkhondo obomvu. Ngoko njengoko ukhangele umzobo, qonda ukuba umgca ophantsi kwitektshi, ngcono ukukhwaza kwengxolo yebhanki ethile.
Xa kuziwa kwi "jet injini band" phakathi kwe-80 Hz ne-300 Hz, i-Bose QC-20 iphakamileyo ngokucacileyo-ngaphezulu kwe-23 dB engcono-kwi-QC-15. Oku kuthetha ukuba i-b-in-ear design yeBose QC-20 iphumelela kakhulu ekunciphiseni ukuvakala kweengqungquthela / ukuvutha komsindo, njengalezo zivela kwiinjini zeenqwelo-moya. Olu luhlu lwamaxesha amaninzi lubandakanya ukuphela kwentetho yentetho yomntu ngokuqhelekileyo (amazwi angamadoda ngokukodwa), oko kungenza i-Bose QC-20 ilungele kulabo bafuna ukuvimba iingxoxo eziseduze.
Nangona kunjalo, i-Bose QC-15 i-over-ear earforms i-QC-20 kwii-frequencies phakathi kwe-300-800 iHz kunye ne-2 kHz. Oku kuphakamisa ukuba i-Bose QC-15 ikwazi ukukhupha izandi eziphezulu, ezinjengeentlobo zeengcambu ezithatha ukufudumala okanye iinkqubo zokushushumbisa umoya kwiindiza. Le mijelo yamaxesha amaninzi ihlanganisa iiphelo eziphakathi kunye nezisentla zenkulumo yabantu, nangona ngaphezulu kwe-2 kHz inokuba yimizila yabantu (umzekelo, abantwana abancinci) becula okanye izinja zihamba.
Ukukhetha phakathi kwe-Bose QC-20 kunye ne-QC-15 inokuxhomekeka kwisithandwa / ukukhetha ukukhetha (in-indlebe ngokubhekiselele kwindlebe) kunye nalapho uceba khona ukusebenzisa. Kungaba nzima ukuthetha ukuba ngubani oya kwenza umsebenzi ongcono wokunquma umculo kunye nengxoxo yomxholo kwi-Starbucks, ubuncinci ukusuka ekukhangela kuphela imilinganiselo.