Tus Kws Tshaj Lij Tshaj Lij Tshaj Plaws - Part 2

Subwoofers tsis yog ib txwm ua haujlwm, tsis yog ib txwm muaj kev cuam tshuam nrog kev ua yeeb yam hauv tsev, thiab tsis tas yuav ua haujlwm rau lawv ua ntej. Lawv tau pib lawv txoj haujlwm hauv kev siv thev naus laus zis nrov hauv 80s lig, hauv lub tso suab sib txuas nrog "tsis tu ncua" stereo amplifiers ntau dua li cov neeg txais ntau-channel - lub sijhawm ntawm kev ua yeeb yam hauv tsev tsuas yog los txog.

Qhov System 2.1 (ib lub subwoofer nrog ib khub ntawm satellites) yog ib qho kev xaiv rau ib khub niam txiv tham (saib thiab: ) yam tsis muaj kev xav tau. Qhov no yuav tsum muaj hwj chim rau ob qho tib si passively low-pass-filtered subwoofer thiab passively high-pass-filtered satellites, tab sis qhov load no tsis sib txawv nyob rau hauv impedance sab "pom" rau lub amplifier tshaj lub load ntawm ib tug multi- txoj kev nrov nrov system. Sib txawv tsuas yog nyob rau hauv lub cev kev faib ntawm ntau txoj kev mus rau hauv ib lub subwoofer thiab satellites, nyob rau hauv hluav taws xob sab nws yog yeej ib txwm zoo tib yam (subwoofers feem ntau muaj ob woofers txuas ntawm nws tus kheej mus rau ob txoj kev, los yog ib tug ob-coil hais lus).

Lub rooj tsav xwm amplifier nrog cov tswj xyuas yuav luag ib txwm nyob tom qab - peb tsis tas yuav mus ntsib nws txhua hnub

Systems 2.1 lawv txawm tau txais koob meej heev nyob rau hauv lub luag hauj lwm no (Jamo, Bose), tom qab tsis nco qab lawm, vim hais tias lawv raug suppressed los ntawm omnipresent. tsev ua yeeb yam systemso, twb tsis poob nrog subwoofers - tab sis nquag sawv daws yuav. Cov no tau hloov passive subwoofers, thiab yog tias niaj hnub no ib tug neeg xav txog 2.1 system tsim los rau kev mloog suab paj nruag (feem ntau), ces lawv yuav xav txog lub kaw lus nrog lub cev muaj zog subwoofer.

Thaum lawv tshwm sim multichannel hom ntawv i tsev ua yeeb yam systems, lawv tau tshaj tawm qhov tshwj xeeb qis-frequency channel - LFE. Raws li txoj cai, nws lub tshuab hluav taws xob tuaj yeem yog ntawm ntau lub zog amplifiers ntawm AV amplifier, thiab tom qab ntawd cov subwoofer txuas nrog yuav tsis ua haujlwm. Txawm li cas los xij, muaj ntau qhov kev sib cav hauv kev pom zoo ntawm kev kho cov channel sib txawv - qhov no amplifier yuav tsum tau "tshem tawm" los ntawm AV ntaus ntawv thiab koom nrog subwoofer. Qhov no ua rau nws yog qhov kev xaiv zoo tshaj plaws rau nws tsis yog hauv lub zog nkaus xwb tab sis kuj ua haujlwm. Nws muaj peev xwm ua kom zoo-tune nws thiab ua tiav qhov kev txiav tawm qis dua li qhov passive subwoofer ntawm qhov loj sib xws thiab tus neeg hais lus zoo sib xws, siv cov lim dej qis thiab kho tau qis (passive low-pass lim ntawm cov lim qis qis yuav yuav siv zog thiab siv nyiaj ntau), thiab tam sim no ntxiv cov haujlwm ntxiv. Nyob rau hauv cov ntaub ntawv no, lub multichannel amplifier (receiver) yog "tso" los ntawm lub hwj chim amplifier, uas nyob rau hauv kev xyaum yuav tsum tau zoo tshaj plaws (lub LFE channel yuav tsum tau lub hwj chim piv rau tag nrho cov hwj chim ntawm tag nrho cov lwm channel ntawm lub system). !), uas yuav yuam kom peb tso tseg lub tswv yim zoo nkauj ntawm lub zog sib npaug rau txhua lub terminals ntsia hauv lub receiver, lossis txwv lub zog ntawm LFE channel, txo cov peev txheej ntawm tag nrho cov kab ke. Thaum kawg, nws tso cai rau tus neeg siv los xaiv lub subwoofer ywj pheej yam tsis tas yuav txhawj xeeb txog kev sib piv nrog lub amplifier.

Los yog tej zaum nrog suab paj nruag stereo systems Puas yog passive subwoofer zoo dua? Cia peb teb qhov no: Rau ntau-channel / xinesmas systems, ib tug active subwoofer yog twv yuav raug hu zoo dua, lub tswvyim ntawm xws li ib tug system yog muaj tseeb nyob rau hauv tag nrho cov respects, raws li peb twb tau tham. Rau lub tso suab / suab paj nruag, ib qho kev ua haujlwm subwoofer kuj yog ib qho kev daws teeb meem, txawm hais tias tsis muaj ntau qhov kev sib cav hauv nws qhov kev pom zoo. Lub subwoofer passive hauv cov tshuab no ua rau muaj kev nkag siab me ntsis, tshwj xeeb tshaj yog thaum peb muaj lub suab nrov (lub tso suab) muaj zog, tab sis tom qab ntawd peb yuav tsum ua tib zoo xav txog thiab txawm tsim tag nrho cov khoom. Los yog theej, peb yuav tsis pom npaj ua, passive 2.1 systems ntawm kev ua lag luam, yog li peb yuav raug yuam kom ua ke.

Peb yuav ua li cas faib? Lub subwoofer yuav tsum muaj lub lim dej qis. Tab sis peb puas yuav qhia txog lub lim dej siab rau cov neeg hais lus tseem ceeb, uas tam sim no yuav ua raws li satellites? Qhov ua tau ntawm qhov kev daws teeb meem no nyob ntawm ntau yam - qhov bandwidth ntawm cov neeg hais lus no, lawv lub zog, nrog rau lub zog ntawm lub amplifier thiab nws lub peev xwm ua haujlwm nrog cov impedance tsawg; Tej zaum nws yuav nyuaj rau qhib cov neeg hais lus thiab subwoofer tib lub sijhawm (lawv impedances yuav txuas nrog rau tib lub sijhawm, thiab qhov tshwm sim impedance yuav qis dua). Yog li ntawd ... ua ntej, lub active subwoofer yog ib tug zoo thiab universal kev daws teeb meem, thiab ib tug passive - nyob rau hauv tshwj xeeb tej yam kev mob thiab nrog zoo kev paub thiab kev paub ntawm ib tug amateur ntawm xws li ib tug system.

Kev sib txuas lus

Ib qho kev nplua nuj heev ntawm cov khoom sib txuas - RCA cov tswv yim, cov neeg hais lus thiab, tsis tshua muaj, cov zis lim siab dhau (ob khub ntawm RCA)

Qhov kev sib txuas no, ib zaug tseem ceeb tshaj plaws rau subwoofers, tau dhau los ua qhov tsis tseem ceeb nyob rau lub sijhawm hauv AV systems peb feem ntau muab. LFE Low Level Signal mus rau ib qho RCA connector, thiab "tsuas yog nyob rau hauv rooj plaub" muaj ib khub ntawm RCA rau lub tso suab sib txuas. Txawm li cas los xij, kev sib txuas nrog tus hais lus cable muaj nws qhov zoo thiab nws cov neeg txhawb nqa. Kev sib txuas ntawm cov neeg hais lus tau dhau los ua qhov tseem ceeb hauv lub tso suab, ob qho tib si vim qhov tseeb tias tsis yog txhua lub amplifiers muaj cov zis qis (los ntawm preamplifier) ​​​​thiab vim yog cov teeb liab tshwj xeeb. Tab sis nws tsis yog tias nws yog lub teeb liab siab; lub subwoofer tsis siv hluav taws xob los ntawm lub tshuab hluav taws xob sab nraud txawm tias qhov kev sib txuas no, vim tias qhov siab input impedance tsis tso cai rau nws; Tsis tas li ntawd, nrog rau qhov kev sib txuas no, zoo ib yam li cov qib qis (rau RCA connectors), lub teeb liab yog amplified los ntawm subwoofer circuits.

Qhov tseeb yog hais tias nrog xws li ib tug (hais lus) kev twb kev txuas, lub teeb liab mus rau lub subwoofer los ntawm tib lub outputs (sab nraud amplifier), nrog rau tib theem thiab "tus cwj pwm" raws li lub ntsiab lus. Qhov kev sib cav no yog me ntsis strained, vim ... lub teeb liab hloov lub subwoofer amplifier ntxiv, ib qho ntxiv, cov theem tseem yuav tsum tau hloov kho, tab sis lub tswv yim ntawm kev sib raug zoo ntawm cov teeb liab mus rau cov neeg hais lus thiab subwoofer thov rau lub tswv yim ... tsuas yog muaj tag nrho cov tsim nyog outputs.

Ua kua theem lossis dhia theem?

Cov khoom siv feem ntau: qib thiab pom yog du, theem yog stepped; khub ntawm lub tso suab RCA ntxiv rau LFE cov tswv yim ntxiv

Peb qhov kev hloov pauv tseem ceeb ntawm lub suab subwoofer tso cai rau koj hloov qib (ntim), kev txwv siab tshaj (tseem hu ua kev txiav tawm) i theem. Thawj ob feem ntau yog kua, qhov thib peb yog smooth los yog bouncy (ob txoj hauj lwm). Qhov no puas yog kev cuam tshuam loj? Ntau manufacturers txiav txim siab ua qhov no tsis yog nyob rau hauv pheej yig subwoofers. Teem lub sijhawm kom raug, txawm tias tsim nyog heev rau kev sib raug zoo, yog nyob rau hauv kev xyaum qhov tsawg kawg nkaus to taub thiab feem ntau ignored ua hauj lwm los ntawm cov neeg siv. Thaum txoj kev sib tw du yog txoj hauv kev zoo tshaj plaws los kho lub subwoofer rau satellites, nws ua rau txoj haujlwm nyuaj dua thiab yog li nyuaj thiab saib tsis taus. Thiab yog li nrog kev hloov kho thiab lim nws yog qhov kev puas tsuaj tag... Pom zoo rau qhov kev sib haum xeeb (hloov hloov lub pob qhov rooj), peb txhawb kom cov neeg siv sim hauv txoj kev yooj yim: tsuas yog txiav txim siab seb qhov hloov pauv twg zoo dua (ntau ntses bass thaj tsam txhais tau tias zoo dua theem sib npaug. ), tsis muaj tedious nrhiav rau qhov zoo tagnrho nrog ntau tus tuav strokes. Yog li yog tias peb muaj kev tswj hwm zoo, cia peb sim tsawg kawg ntawm txoj haujlwm huab, piv txwv li. txawv ntawm 180 °, thiab peb yuav pom qhov txawv. Hauv qhov xwm txheej hnyav, qhov teeb meem tsis raug txhais tau hais tias lub qhov tob hauv cov yam ntxwv, thiab tsuas yog "kho" ib qho txhais tau tias tsis muaj zog.

Kev tswj chaw taws teeb

Txog tam sim no, tsuas yog qee qhov me me ntawm subwoofers tau nruab nrog chaw taws teeb tswj siv cov chaw taws teeb tswj - rau lawv, qhov no tseem yog cov khoom siv khoom kim heev, txawm tias ua tau zoo heev, vim tias teeb tsa lub subwoofer los ntawm txoj haujlwm mloog zoo heev pab kom ua tiav cov txiaj ntsig zoo tshaj plaws. Nws yog qhov zoo dua los ua lwm txoj hauv kev tshaj li khiav rov qab ntawm lub rooj zaum thiab lub subwoofer. Txawm li cas los xij, qhov kev cia siab yog tias cov chaw taws teeb yuav dhau los ua cov cuab yeej siv yooj yim, thiab cov chaw subwoofer yuav yooj yim dua thiab muaj tseeb dua ua tsaug rau cov apps rau cov khoom siv txawb - qhov kev daws teeb meem no yog pheej yig dua li ntxiv cov chaw taws teeb, thiab tseem qhib ntau heev. muaj peev xwm ntau.

Ua tib zoo! Tus hais lus loj!

Muaj subwoofer los ntawm hais lus loj Cov woofers me ntsis... txaus ntshai. Ua ib lub suab nrov loj tsis yog ib qho kev kos duab zoo - lub pob tawb loj thiab lub diaphragm tsis tas yuav muaj nqi, lawv nyob ntawm qhov zoo tshaj plaws (thiab yog li qhov loj me) ntawm cov hlau nplaum, uas txiav txim siab ntau yam tsis tseem ceeb. Ntawm lub hauv paus no, los ntawm kev xaiv tsim nyog ntawm lwm cov qauv tsim (coil, diaphragm), lub zog, kev ua haujlwm zoo, tsis tshua muaj suab nrov, thiab cov lus teb zoo impulse. Ib tus hais lus loj thiab tsis muaj zog yog kev puas tsuaj, tshwj xeeb tshaj yog nyob rau hauv ib qho system ntses bass thaj tsam reflex.

Qhov no tej zaum yuav yog vim li cas qee cov neeg tau ceev faj ntawm cov woofers loj (hauv cov neeg hais lus nrov), feem ntau yog liam tias lawv "qeeb", raws li pom los ntawm qhov hnyav diaphragm. Txawm li cas los xij, yog tias lub zog oscillatory hnyav ua rau muaj txiaj ntsig zoo "tsav", tom qab ntawd txhua yam tuaj yeem ua tiav, ob qho tib si hauv lub suab nrov nrov thiab hauv lub suab nrov subwoofer. Tab sis ceev faj - qhov tsis muaj zog ntawm cov hlau nplaum yuav tsis raug them los ntawm lub zog loj ntawm lub tshuab hluav taws xob lossis nws cov kev ua tau zoo (tam sim no, thiab lwm yam), uas qee cov tuam ntxhab muab. Booster tam sim no zoo li roj, thiab txawm tias cov roj zoo tshaj plaws yuav tsis txhim kho kev ua haujlwm ntawm lub cav tsis muaj zog.

Lub kaw lus zoo ib yam, lub suab nrov (sab nraud) thiab ntau pua watts tuaj yeem tsim cov txiaj ntsig sib txawv, nyob ntawm lub zog thiab kev teeb tsa ntawm lub suab nrov tsav.

Tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv ntawm ib tug bass reflex, "pob" los ntawm ib tug tsis muaj zog hlau nplaum (thiab / los yog ib tug me me lub tsev ntim), lub impulse teb yuav tsis tau "kho" los ntawm lub hwj chim los ntawm lub amplifier, uas yuav siv tau los kho qhov zaus. teb, yog li ntawd nyob rau hauv active subwoofers - ntau tshaj li nyob rau hauv hais lus - nws yog siv kaw lub cev. Tab sis ntses bass thaj tsam reflex nws ntxias nrog nws cov kev ua tau zoo dua, nws tuaj yeem ua si nrov dua, ua tau zoo ... thiab qhov tseeb ntawm kev tawg tsis yog qhov tseem ceeb hauv tsev ua yeeb yam. Nws yog qhov zoo tshaj plaws kom muaj txhua yam nyob rau hauv ib zaug, uas yuav tsum muaj cov khoom siv (txhua yam) hais lus nrov nrov, lub zog siab los ntawm lub amplifier thiab rooj plaub nrog lub ntim zoo. Tag nrho cov no raug nqi nyiaj, yog li loj, tsim nyog subwoofers feem ntau tsis tuaj pheej yig. Tab sis muaj "yog vim li cas", tab sis kom pom lawv, nws tsis txaus los saib lub subwoofer los ntawm sab nraud, nyeem nws cov yam ntxwv ntawm tus kheej, lossis tseem ntsaws rau hauv thiab xyuas ob peb qhov chaw nyob hauv chav random. Nws yog qhov zoo tshaj plaws kom paub txog "qhov tseeb nyuaj" ... hauv peb qhov kev xeem thiab kev ntsuas.

Grille - tshem tawm?

W multi-txoj kev nrov nrov Qhov teeb meem ntawm kev cuam tshuam ntawm lub npog ntsej muag ntawm cov yam ntxwv ua haujlwm yog qhov hnyav heev uas peb coj nws mus rau hauv tus account hauv peb qhov kev ntsuas los ntawm kev sib piv qhov xwm txheej (ntawm lub ntsiab axis) nrog thiab tsis muaj lub ntsej muag. Yuav luag txhua qhov sib txawv (rau kev puas tsuaj ntawm cov hniav nyiaj hniav kub) yog li pom tseeb tias peb pom zoo kom tshem nws, qee zaum kom meej meej.

Nyob rau hauv cov ntaub ntawv ntawm subwoofers, peb tsis thab nrog qhov no tag nrho, vim hais tias zoo li tsis muaj grille hloov qhov kev ua tau zoo mus rau ib tug pom tau hais tias. Raws li peb tau piav qhia ntau zaus, ib txwm gratings lawv cuam tshuam cov hluav taws xob tsis zoo heev los ntawm cov khoom siv uas lub suab nrov tau them, tab sis los ntawm tus ncej uas cov khoom siv no tau ncab. Lub attenuation qhia los ntawm cov ntaub so ntswg ib txwm yog me me, tab sis luv luv nthwv dej ntawm nruab nrab thiab siab zaus tau cuam tshuam los ntawm scaffolds, cuam tshuam thiab yog li tsim kev tsis sib xws ntxiv hauv cov yam ntxwv. Nyob rau hauv cov ntaub ntawv ntawm subwoofers, qhov tsawg zaus nthwv dej lawv emit yog ntev heev (kwv yees rau lub thickness ntawm lub thav duab), yog li ntawd lawv tsis xav txog ntawm lawv, tab sis "ntws nyob ib ncig ntawm" xws li ib tug obstacle li cov npoo ntawm rooj plaub, kis tau yooj yim thiab nyob rau txhua qhov chaw. Yog li ntawd, subwoofers tuaj yeem ruaj ntseg nrog cov hniav nyiaj hniav kub, tsuav yog ... lawv muaj zog thiab ruaj ntseg zoo kom tsis txhob nkag mus rau hauv kev vibrations ntawm qee zaus thiab qib siab dua, uas qee zaum tshwm sim.

Kev xa xov wireless feem ntau yog xaiv tau thiab xav tau kev yuav khoom tshwj xeeb module, tab sis qhov chaw nres nkoj hauv subwoofer twb tau tos nws.

Omnidirectional

Thaum ntsuas subwoofers, peb tsis suav nrog cov yam ntxwv ntawm kev taw qhia, yog li peb tsis ntsuas cov yam ntxwv ntawm cov ces kaum sib txawv. Nws yog ib qho nyuaj los tham txog lub axis raws li qhov ntsuas tau ua, vim qhov no yog qhov kev ntsuas nyob ze - (raws li qhov amplitude ntawm nws txoj haujlwm tso cai). Tsawg zaus, vim lawv qhov ntev wavelengths, loj dua qhov loj ntawm lub woofer loj thiab nws cov ntaub ntawv, propagate omnidirectionally (sphereical yoj), uas yog lub ntsiab lus tseem ceeb ntawm kev siv subwoofer systems feem ntau. Yog li nws tsis muaj teeb meem tiag tiag seb lub subwoofer yog tsom ncaj qha rau ntawm tus mloog lossis me ntsis mus rau sab, nws tuaj yeem nyob hauv qab vaj huam sib luag ... Yog li tsis tas yuav tsum ua kom meej "tsim" lub subwoofer ntawm qhov chaw mloog, uas tsis tau txhais hais tias nws tsis tu txhua qhov chaw nws nyob.