01 ntawm 08
Pheej yig Amps Face Off: Lepai LP-2020A + vs. Topping TP30
Cov no yog cov zoo sij hawm tseeb rau cheapskate suab enthusiasts. Ua tsaug rau cov neeg lag luam hauv Geek hauv internet xws li Chaw Express thiab Monoprice muaj ntau hom khoom lag luam tawm ntawm cov nqi tsawg tsawg uas qee zaum lawv yuav muaj peev xwm thiab kuj tau dawb.
Tab sis Lawv Puas Muaj Yam Zoo: Ob Tus Nqi Uas Muaj Nqi Qis
Cov lus nug, ntawm chav kawm, yog li cas zoo yog lawv?
Ib qeb twg cov nqi zoo li impossibly tsawg yog cov me quav amplifiers. Cov amps feem ntau muaj ib los yog ob txoj hauv kev siv, kev tswj lub ntim, thiab tej zaum 10 los sis 20 watts ntawm lub hwj huam ib lub voj voog. Tej zaum koj yuav tsis ntes cov nqe no mus txog $ 2,000 ntawm cov neeg ua haujlwm siab tshaj plaws, tab sis lawv zoo li daim pib rau, hais, ib tug qub khub JBLs los yog Thaj Tsam, lossis ib nkawm tshiab ntawm Dayton Audio B652s.
Thiab kos tawm cov nqi! Lepai LP-2020A +, nyob ntawm 20 watts ib channel, yog $ 26.88 xwb.
Tab sis tos ib pliag! Qhov Chaw Express kuj muaj cov Topping TP10-MK4, uas yog tus nqi $ 72, tab sis yog nyob ntawm 10 watts ntawm ib lub vev xaib mus rau 8 ohms. Nkawm ob leeg siv tshuab T Tpl tshuab Tpl, vim li ntawd nws yog los ntawm lub tuam txhab hu ua Tripath. Nws yog ib lub lag luam, tsis yog ib qho kev lees paub ntawm chav kawm; nws yog tiag tiag ib variant ntawm high-efficiency hoob D (switching) amplification.
"Dab tsi muab?" Kuv xav tsis thoob thaum kuv pom ob tug amps. Kom paub meej, lub Topping zoo li ntau tus nicer, tab sis nws puas muaj lwm yam zoo uas yuav pov thawj nws ze li 3 x nqi ntau dua?
Kuv tsuas tau paub. Tab sis tsis txhob cia li mloog lawv thiab qhia rau koj tias ib qho muaj ntau dua "sab hauv kev nthuav dav" los sis ntau dua ntawm ib qho "midrange kua," Kuv yuav ua li cas feem ntau cov neeg saib xyuas tsis tuaj yeem: Kuv yuav khiav qee qhov kev ntsuam xyuas hauv lawv kom paub dab tsi yog tiag tiag mus.
02 ntawm 08
Lub Contestants
Npaj Kom Txiav Txim Siab
Kuv yuav kuv tus kheej ib LP-2020A + ob peb lub lis piam dhau los, thiab ib tug neeg khub ntawm Dayton B652 tham. Lub B652, tab tom ua ib qho amazing deal - tsis muaj leej twg yuav hu ua tus neeg hais lus zoo nkauj, tab sis kuj ceebtoom, tshwj xeeb tshaj yog rau $ 32 / khub.
Raws li koob hmoov yuav muaj nws, kuv tus phooj ywg Geoff Morrison tau tshwm sim kom muaj ib qho Topping TP30 zaum ntawm, uas zoo li yuav tsum tau tib tus amplifier li TP10 MK4 nrog ntxiv ntawm lub mloog pob ntseg thiab ib lub digital digital input. Ntawm chav kawm, qhov TP30 no tsis muaj.
Yog li kuv tau muaj ob tug contestants. Kev txiav txim los ntawm specs ib leeg, LP-2020A + tej zaum yuav zoo nkaus li zoo dua, nrog 20 watts ib channel es tsis txhob 10. Txawm li cas los, kuv tsis pom dab tsi nyob rau ntawm qhov chaw tshaj tawm uas tau hais tias ua li cas tias 20 watts raug ntsuas. Rau ib qho kev ntsuas fais fab kev sib thooj txhais tau tias txhua yam, koj yuav tsum qhia meej txog qhov impedance nws tau kuaj hauv (feem ntau yog 8 lossis 6 lossis 4 ohms); theem ntawm tag nrho harmonic distortion ntxiv rau lub suab nrov (THD + N) ntawm qhov kev ntsuam xyuas zog (feem ntau 0.5% lossis 1% lossis 10%); qhov ntau zaus lossis ntau zaus ntawm qhov kev xeem tau khiav; thiab tus naj npawb ntawm cov uas tau tsav.
Raws li koj tuaj yeem pom nyob rau sab nraum qab saum toj no, TP30 tus zoo-ua tau khoom, nrog rau ib qho rooj plaub thiab kab lus zoo dua-cable thiab RCA connectors.
Postscript
Tom qab no tsab xov xwm tau muab tso tawm, tus nyeem ntawv (ua tsaug, Jerrold!) Tuaj yeem tshaj tawm hais tias qee tus LP-2020A + tus tswv tau muab kho dua lawv cov units nrog ib tus neeg muaj zog, 5-amp khoom zoo li no ntawm Amazon. Qhov kev tshoov siab ua rau kuv rov qab kho cov specs ntawm qhov chaw tshaj tawm. LP-2020A + nplooj ntawv rau ntawm qhov chaw tus nqi fais fab xa nrog LP-2020A + kuaj ntawm 2 amps. Tab sis lub hwj huam kuv tau txais yog nyob ntawm 3 amps. Lub tshuab thev rau ntawm nws tus kheej yog sau rau 2-amp khoom.
Lus hauv no teb OK, peb 'ntsaws' hauv thiab pom dab tsi tshwm sim.
03 ntawm 08
Lepai LP-2020A + Cov Zis Muaj Zog
Ntsuas lub LP-2020A +
Yog tias LP-2020A + ua neej nyob txog nws qhov kev siv fais fab tuag 20-watts-ib-channel , kuv siv kuv tus Clio 10 FW suab analyzer los khiav dej num ntxiv nrog rau lub suab nrov thiab lub zog cheb ntawm 1 kHz. Tag nrho kev sib haum xeeb distortion ntxiv rau suab nrov (THD + N) yog nyob rau Y (ntsug axis), thaum lub zog tso tawm (hauv watts) nyob rau X (kab rov tav) axis. Nov yog qhov kuv tau txais.
8-ohm load, ob txoj kev uas tau tsav
9.1 watts ntawm 0.5% THD
9.9 watts ntawm 1% THD
Ua li 4-ohm load, LP-2020A + tau mus rau hauv kev tiv thaiv hom (xuas muted, xiav teeb ntawm ntim tswj kev xais) ua ntej sweep tag, tsis muaj teeb meem li cas kuv teev cov tsis muaj kev sib tsoo. Kuv twb mus ntsuas cov qhab nias tawm ntawm tes. Qhov siab tshaj plaws uas kuv tau ntawm 4 ohms yog 9.4 watts ntawm 1.5% THD + N.
Daim ntawv ceeb toom kuj hais tias cov distortion ntxiv rau lub suab nrov dhau ntawm qib qis: 0.5% thiab 1% THD + N ntawm 0.1 thiab 2.4 watts. Feem ntau ntawm koj qhov kev mloog yuav nyob rau theem qis no, tsis yog nyob rau thaj tsam 5- mus rau 8-thaj chaw uas tus amp ua qhov zoo tshaj plaws.
Cov kev ntsuas no yog mus rau hauv cov khoom uas tau muab tso rau hauv - qhov no hu ua "dummy" loads uas siv tech geeks zoo li kuv siv vim hais tias lawv muab peb ib lub hauv paus uas zoo ib yam (as opposed to speakers, nws impedance txawv heev). Kuv paub tias, qee qhov pheej yig Class D amps yog nyob ntawm tus neeg hais lus nrog rau kev ua haujlwm kom yog; tus neeg hais lus lub peev xwm thiab kev ua tub sab yuav ua rau kom tag nrho cov xov tooj hluav taws xob muaj zog los ntawm lub amp. Yog li kuv tau khiav hauv kev sib txuam nrog Hsu tshawb xyuas HB1 1 Mk2 tham (impedance 7.7 ohms ntawm 1 kHz) txuas rau ntawm qhov tsis ua haujlwm. Cov txiaj ntsim tau zoo li qub: 8.9 watts ntawm 0.5% THD, 9.8 watts ntawm 1% THD.
04 ntawm 08
Topping TP30 zog tso zis
Ntsuas lub TP30
Daim duab saum toj no qhia tau tias Topping TP30 ntsuas raws li cov xwm txheej. Cov nyom ntsuab yog rau hauv 8-ohm load, cov kab xo ntshav liab mus rau hauv 4-ohm load.
8-ohm load, ob txoj kev uas tau tsav
9.3 watts ntawm 0.5% THD
10.3 watts ntawm 1% THD
4-ohm load, ob txoj kev uas tau tsav
16.4 watts ntawm 0.5% THD
17.4 watts ntawm 1% THD
Daim ntawv ceeb toom ua li cas lub TP30 outperforms LP-2020A + txawm tias nws specifications tsis zoo? Cia li mus qhia koj - amp specs txhais hais tias tsis muaj dab tsi tshwj tsis yog tias kev sim cov kev xeem (THD + N qib, muaj pes tsawg txoj kev uas tau tsav, load impedance, thiab lwm yam).
Daim ntawv ceeb toom kuj hais tias thaum lub TP30 kev distortion ntxiv rau suab nrov li qis tsis zoo, nws zoo dua li LP-2020A +, nyob hauv 0.5% ntawm qib 0.4 watts thiab max output.
05 ntawm 08
Topping TP30 Kev Tshaj Tawm Txog Kev Tshaj Tawm
Kev hloov lub sij hawm yog qhov kev ntsuas ntawm kev ua haujlwm li cas tus amplifier ua txhua lub suab nrov ntawm lub suab, los ntawm ntses bass rau nruab nrab mus rau treble. Rau ib qho kev hloov, qhov zoo tshaj plaws yog qhov kab hauv kev tuag ntawm 0 dB.
Kuv tabtom muab qhov TP30 qhov tau tshwm sim ntawm no ua ntej vim kuv tau txais kev ntsuas ntawm qhov qub. Lus qhia ntxiv txog LP-2020A + qhov txawv ntawm qhov kev xeem no tuaj.
Teb cov lus teb, 8-ohm load, ref. qib 2.83 volts (1 watt)
-0.32 dB ntawm 20 Hz
-0.50 dB ntawm 20 kHz
Channel seem yuam kev ntawm 1 kHz, 8-ohm load, ref. qib 2.83 volts (1 watt)
txoj cai channel +0.11 dB siab dua sab laug
Ntxiv dua thiab, tsis yog ib qho kev tshwm sim zoo, tab sis rau kev lag luam pheej yig nws zoo xwb.
06 ntawm 08
Lepai LP-2020A + Kev Tshaj Tawm Txog Kev Nyab Xeeb
Thaum kuv sim ntsuas LP-2020A + 's qhov nquag teb uas siv cov load resistors kuv hais ua ntej, Kuv tau txais coj txawv txawv. Cov dej nuv ntses los tawm tsam, poob -3 dB ntawm 76 Hz. Txawm li cas los xij, kuv tsis pom tias tsis muaj cov ntses bass thaj tsam thaum kuv mloog LP-2020A +, vim li ntawd kuv xav tias qhov tshwm sim yuav yog vim muaj qee yam ntawm LP-2020A + thaum tsav tsheb thauj khoom tiv thaiv.
Yog li kuv txiav txim siab los ntsuas cov lus teb los ntawm kev txuas tus LP-2020A + rau ib qho ntawm kuv Hsu HB-1 hais lus, tso lub microphone nyob rau hauv pem hauv ntej ntawm nws, ua qhov ntsuas ntau zaus ntawm tus neeg hais lus, tom qab ntsuas qhov siv cov Topping TP30 xwb ntawm LP-2020A +. Koj tuaj yeem pom qhov tshwm sim nyob rau hauv daim duab saum toj no, qhov twg xiav kab ntsuas pom cov txiaj ntsig ntawm TP30, thiab cov kev ntsuam xyuas ntsuab pom tshwm nrog LP-2020A +. Cov kev tshwm sim no muaj nrog rau LP-2020A + lub suab lus tswj lag luam.
Teb cov lus teb, 8-ohm load, ref. qib 2.83 volts (1 watt)
+4.86 dB ntawm 20 Hz
0.00 dB ntawm 20 kHz
Channel seem yuam kev ntawm 1 kHz, 8-ohm load, ref. qib 2.83 volts (1 watt)
laug channel +0.21 dB siab dua txoj cai
Nco ntsoov tias LP-2020A + tus bass teb yog ua tau -1.26 dB hauv qab ntawm qhov TP30 ntawm 30 Hz. Vim li cas, LP-2020A + muaj kev sib tw ntawm 20 Hz. Given tias muaj tsawg kawg 20 Hz cov ntsiab lus nyob rau hauv movies thiab suab paj nruag, thiab hais tias tsuas yog tus loj tshaj plaws tham thiab subs muaj peev xwm muab tsim 20 Hz, nws tsis yog ib yam dab tsi koj yuav tau hnov. Tsis zoo li no me ntsis amp yuav xa cov qhov tso zis thaum 20 Hz lawm.
Yeej, timbre, los yog tonal tshuav, ntawm no ob amps yog hais txog tib yam.
07 ntawm 08
Lepai LP-2020A + Tone Control Effects
Cov no yog cov teebmeem ntawm kev siv lub suab ntawm LP-2020A + - dua, ntsuas los ntawm kev khiav lub amp los ntawm Hsu HB-1 Mk3 tham. Cov kab xiav yog cov nyhuv ntawm cov ntses bass thaj tsam thiab kev tswj ntawm treble tau qhib tag nrho. Cov kab liab liab yog qhov tshwm sim ntawm cov khoom ntawm kev tswj kom tag nrho txoj kev.
Tshaj siab tshaj plaws thiab txiav rau ob leeg yog nyob rau ntawm 10 mus rau 12 dB, uas yog ib qho ncaj ntau ntau. Nco ntsoov tias cov kev ntsuas no tshwm sim nyob ntawm qhov kev ntsuas ntawm 1 watt. Yog tias koj tuaj yeem tiv thaiv cov kev tswj ntawm txhua txoj kev los ntawm kev mloog cov suab nrov, LP-2020A + yuav tsis muaj lub hwj chim txaus los txhawb qhov kev txhawb zog uas koj pom ntawm no.
08 ntawm 08
Mloog Lus thiab Kev Xaus
Yeej Mloog Lus
Cov kev txawv no sib txawv li cas rau cov kev mloog kev xav? Yog xav paub, kuv piv ob lub amps ntawm cov lus sib tham nrog cov Hsu HB-1 tham. Kuv sau ib yam tam sim ntawd: Lub Topping TP30 yuav siv me ntsis ntxiv. Kuv yuav tsum tau tig nws txoj kev mus kom tau ntim zoo thaum kuv siv kuv lub iPod kov ua qhov chaw - txawm tias HB-1 yog tus neeg hais lus thaij.
Rau kuv pob ntseg, LP-2020A + muaj coarseness hauv nruab nrab thiab tsawg dua treble uas ua rau lub suab nrov me ntsis edgy. Ntawm tus cwj pwm phem Terry Landry cov ntaub ntawv "Amazon" muaj qee lub latin percussion instruments tau me ntsis ntawm lawv cov lus, rau lawv txhais tau hais tias lawv tau tawg. Txawm li cas los xij, LP-2020A + 's lub thawv treble muaj suab nrov ntau dua, raws li qhov ntsuas tau pom; lub TP30 suab me ntsis muag hauv treble los ntawm kev sib piv. Tab sis qhov sib sib zog nqus ntses bass thaj tsam uas qhib Holly Cole's "Train Song" ua tau suab nrawm thiab tsis tshua muaj ntau los ntawm TP30.
Zuag qhia tag nrho, kuv xav hais tias TP30 cov suab zoo dua, tab sis ob leeg muaj zog thiab tsis muaj zog. Kuv xav tias tej zaum yuav xum lub suab ntawm LP-2020A +. Thiab kuv twv qee tus neeg yuav tsis pom tias qhov txawv yog qhov txawv.
Lo Lus Kawg
Nws zoo nkaus li los ntawm kuv cov kev ntsuas tias Topping TP30 yog dab tsi kuv yuav hu ua " tiag tiag amp ": Koj tuaj yeem txuas mus rau txhua tus neeg hais lus thiab nws mam li xa ib lub mloog zoo thiab mloog huv.
Lub Lepai LP-2020A +, tab sis, zoo li muaj feem xyuam nrog qee qhov kev sib tw tsim kev lag luam uas cia nws ntaus nws cov nqi qis tshaj plaws. Nws ua rau tib tus nqi zog rau hauv 8-ohm load raws li tus nqi 4X-ntau-nqi TP30.
Ntawm no yog kuv qhov kev pom zoo: Tau txais TP10-MK4 yog tias koj muab tso ua ke ib qho kev ua haujlwm loj hauv lub cev los sis ib chav pw hauv tsev los sis hauv chav nyob. Tau LP-2020A + yog tias koj tsuas xav tau ib yam dab tsi uas ua rau lub suab zoo, zoo li lub tsev tso nkawm los yog ua si hauv lite jazz hauv chav tos.