Mnzanga ndi mnzanga, Geoff Morrison, adayang'anitsitsa nthawi yambiri chifukwa cha ndemanga yake ya Bose QC-15 yomwe imamveka phokoso lamakutu pa The Wirecutter komanso Bose QC-20 in-earceling headphone pa Forbes. Ogwiritsira ntchito Savvy nthawi zonse amafunafuna zosankha zomwe zingatheke bwino, owerenga ambiri a Geoff afunsira tchati choyesa chomwe chikufanizira phokoso lochotsa phokoso la Bose QC-15 motsutsana ndi Bose QC-20. Chifukwa cha kutchuka kwa pempholi, ndinaganiza kuti zingakhale zothandiza kuyika pamodzi.
Kuyesera kunkachitidwa pogwiritsa ntchito GRAS 43AG khutu / masaya tamimator, kompyuta yamtundu wotsegulira TrueRTA software ndi mawonekedwe a audio ya M-Audio MobilePre USB. Bose QC-15 ndi Bose QC-20 anayesedwa pogwiritsa ntchito kanema yoyenera. Maulendo omwe anagwiritsidwa ntchito amayesa 20 Hz kufika 20 kHz, yomwe ndi yotchuka kwambiri kwa zipangizo zamakono pamsika. Mipata yomwe ili pansipa 75 dB imasonyeza kuchepa kwa phokoso lakunja (ie, 65 dB pa chithunzicho amatanthawuza kuchepetsa -10 dB kumvekedwe kunja kunja kwa phokoso lakumveka).
Mphepete yodzipatula ya Bose QC-15 imasonyezedwa mumtundu wobiriwira, pamene Bose QC-20 ikuwonetsedwa mu tsatanetsatane wofiira. Kotero pamene mukuyang'ana pazithunzizo, mvetserani kuti m'munsi mzerewu pa tchati, kumakhala phokoso loletsa phokoso lapadera.
Pankhani ya "jet injini band" pakati pa 80 Hz ndi 300 Hz, Bose QC-20 ndi yabwino kwambiri - pafupifupi 23 dB bwino - ku QC-15. Izi zikutanthauza kuti mapangidwe a Bose QC-20 ndi othandiza kwambiri pochepetsa kuchepetsa kuzunzika / kuzungulira, monga omwe amabwera kuchokera ku injini za ndege. Mafupipafupi ameneĊµa amathanso kumapeto kwa chilankhulo cha umunthu (mau a amuna makamaka), zomwe zingapangitse Bose QC-20 kukhala yabwino kwa iwo omwe angafune kutulutsa zokambirana.
Komabe, Bose QC-15 amamvetsera kwambiri kuposa QC-20 pafupipafupi pakati pa 300-800 Hz ndi apamwamba kuposa 2 kHz. Izi zikusonyeza kuti Bose QC-15 ndi yotheka kwambiri kumveketsa phokoso lapamwamba kwambiri, monga mtundu wa kuthamanga komwe kumachokera ku kutentha kapena kutentha kwa ndege pa ndege. Mitsinje yafupipafupiyi imaphatikizapo zolinga zapakati ndi zam'mwamba za zolankhula za anthu, ngakhale zambiri kuposa 2 kHz zingakhale pambali mwa anthu (mwachitsanzo, ana ang'onoang'ono) akuimba kapena agalu akudula.
Kusankha pakati pa Bose QC-20 ndi QC-15 kungadalire pazokonda / kutengeka (mu-khutu ndi kumutu) komanso kumene wina akukonzekera. Zingakhale zovuta kunena kuti ndi ndani amene angapange ntchito yabwino yothetsa nyimbo ndi chiyambi pa Starbucks, osati kungoyang'ana payeso.