01 ngo-08
Ama-Amps aphansi avuliwe: Lepai LP-2020A + vs. Topping TP30
Lezi zikhathi ezimnandi ngempela kubantu abathandayo abanomsindo abaphansi. Ngenxa yokuphakama kwabathengisi be-intanethi be-geek-friendly njengengxenye ye-Parts Express ne-Monoprice kukhona zonke izinhlobo zemikhiqizo yomsindo ngaphandle kwamanani amancane kangaka kangangokuthi kwezinye izimo cishe nabo bangakhululeka.
Kodwa Ingabe Ziyinto Enhle: Zombili Azinenani Eliphansi
Umbuzo, yiqiniso, ukuthi bahle kangakanani?
Isigaba esisodwa lapho amanani abonakala engenakwenzeka khona amancane ama-amplifiers amancane ahlanganisiwe. Lezi-amps zinezimpendulo eyodwa noma ezimbili, ukulawula ivolumu, futhi mhlawumbe u-10 noma ama-watts angu-20 wamandla ngesiteshi ngasinye. Cishe ngeke uzobhekelela lezi zikhulumi ezingu-$ 2,000 zezinkulumo eziphezulu zokugcina umbhoshongo, kepha zibonakala nje ithikithi, zithi, i-pair ye-JBL noma iPolks, noma i-Dayton Audio B652s entsha.
Futhi hlola amanani! I-Lepai LP-2020A +, elinganiswe kuma-watts angu-20 ngesiteshi ngasinye, i-$ 26.88 nje.
Kodwa linda kancane! Izingxenye Express nazo zinikeza i-Topping TP10-MK4, ebiza ama-dollar angu-72 kodwa ikala ku-watts angu-10 ngesiteshi ngasinye sibe ngama-oh ohms angu-8. Bobabili basebenzisa ubuchwepheshe be-Class T amplifier, okuthiwa yiyo ngoba ivela enkampeni okuthiwa i-Tripath. Inguphawu lokuthengisa, hhayi isigaba se-amplifier esaziwayo; impela nje ukuhlukahluka kokusebenza kahle kweKlasi D (ukushintsha) ukukhulisa.
"Yini enikezayo?" Ngangizibuza lapho ngibona ama-amps amabili. Ngokuqinisekile, i-Topping ibheka kahle kakhulu, kodwa ingabe inezinye izinzuzo ezingase zilungise inani layo elilinganiselwa ku-3x?
Kwadingeka nje ngithole. Kodwa kunokuba nje ubalalele futhi bakutshele ukuthi umuntu unikeza imininingwane "yangaphakathi" noma ngaphezulu "midrange yamanzi," ngizokwenza lokho ababuyekezi abaningi abakwaziyo: Ngizogijima amareyibhile ambalwa kubo ukuze ngithole kwenzekani ngempela.
02 ngo-08
Abaqhudelwano
Ukulungela Ukufanisa
Ngazithengela i-LP-2020A + amasonto ambalwa adlule, kanye nesikhulumi sezikhulumi ze-Dayton B652. Kodwa-ke, i-B652 yaba yisivumelwano esinqabile - hhayi ukuthi ubani angabiza isikhulumi esicacile-ozwakalayo, kodwa ngokuzwakalayo alaleleka, ikakhulukazi i $ 32 / pair.
Njengoba inhlanhla yayizoba nayo, umlingani wami uGeoff Morrison unesihlalo esiphezulu se-Topping TP30, okubonakala sengathi siyi-amplifier efanayo ne-TP10 MK4 ngokufaka i-headphone ne-USB digital input. Yiqiniso, i-TP30 ayisekho.
Ngakho nganginezimpikiswano zami ezimbili. Uma sibheka ama-specs yedwa, i-LP-2020A + ingase ibonakale iphakeme, i-watts angu-20 ngesiteshi ngasinye esikhundleni se-10. Kodwa-ke, angitholanga lutho kwi-Parts Express site eyathi ukuthi lawa ma-watts angu-20 alinganiswa kanjani. Ukuze ukukala kwamandla okukhulisa amandla kusho lutho, udinga ukucacisa impedance eyayihlolwe kuyo (ngokuvamile 8 noma 6 noma 4 ohms); izinga lokuhlanekezela kwe-harmonic inani kanye nomsindo (THD + N) lapho isilinganiso samandla sinikezwa (ngokuvamile u-0.5% noma i-1% noma i-10%); ububanzi noma ibanga lokuvama lapho kuhlolwa khona; futhi inani leziteshi eziqhutshwa.
Njengoba ungabona emgodini owedlule uphendulela ngenhla, umkhiqizo we-TP30 ungumkhiqizo ongcono, onesibopho esiphezulu kanye ne-high-quality speaker-cable kanye nezixhumi ze-RCA.
I-Postscript
Emva kwalesi sihloko sithunyelwe, umfundi (ngiyabonga, Jerrold!) Nge-imeyli ukukhombisa ukuthi abanye abanikazi be-LP-2020A + bavuselele amayunithi abo ngokuhlinzeka okunamandla kakhulu, oku-5 amp amp like lokhu kusuka ku-Amazon. Yikuphi okuphefumulelwe ukuthi ngiphinde ngibheke ama-specs kwi-Parts Express site. Ikhasi le-LP-2020A + kulelo sayithi lilinganisela amandla okuthunyelwa nge-LP-2020A + evivinywa lapha ku-2 amps. Kodwa amandla engiwutholile anikezwe ku-3 amps. I-amplifier ngokwayo ibhalwe nge-2-amp supply.
Kulungile, ake sixhumane futhi sibone okwenzekayo.
03 ngo-08
I-Lepai LP-2020A + Okukhipha amandla
Ihlola i-LP-2020A +
Ukuze ubone ukuthi i-LP-2020A + iphila yini isimangalo samandla esiteshi saso- 20-watts-ngayinye , ngisebenzise i-analyzer ye-audio yami ye-Clio 10 FW ukuze ngiphambane nomsindo ngokumelene nomandla ukushayela ku-1 kHz. Ukuphazamiseka kwengqikithi ye-harmonic nomsindo (THD + N) ku-Y (i-axis eqondile), kuyilapho amandla okukhipha (ku-watts) ase-X (enezingqimba) i-axis. Nakhu engikutholile.
8-ohm umthwalo, zombili iziteshi eziqhutshwa
9.1 Watts at 0.5% THD
9.9 ama-watts ku-1% THD
Ngomthwalo we-4-ohm, i-LP-2020A + iyaqhubeka imodi yokuvikela (okukhiphayo kuthulisiwe, ukukhanya okwesibhakabhaka kuzungeze ukulawula ivolumu) ngaphambi kokuba kuqedwe, kungakhathaliseki ukuthi ngibeka kanjani imingcele evulekile. Ngaqeda ukulinganisa ukukhishwa okukhulu ngesandla. Umkhiqizo ophezulu kakhulu engingawathola ku-4 ohms kwakungu-9.4 watts ku-1.5% THD + N.
Qaphela futhi ukuthi ukuphazamiseka kanye nomsindo ophezulu kakhulu emazingeni aphansi: 0.5% no-1% THD + N phakathi kuka-0.1 no-2.4 watts. Iningi lokulalela kwakho kuzoba kula mazinga aphansi, hhayi esifundeni se-5- kuya ku-8-watt lapho i-amp yenza okusemandleni.
Lezi zilinganiso zingena emithonjeni yokulayisha - okuthiwa "i-dummy" imithwalo ye-tech geeks engiyisebenzisayo ngoba isinika isisekelo esivumelanayo (ngokuphambene nezikhulumi, impedance yakhe ihluka kakhulu). Ngangazi ukuthi amanye ama-amps ase-Class D angabizi kakhulu ancike ekukhulumeni isikhulumi ukuze kusebenze kahle; ikhono lomkhulumeli kanye nenzuzo yesikhulumi idonsa wonke amandla we-radio-frequency eyenziwe yi-amp. Ngakho-ke ngagijimela ngendlela efanayo ne-Hsu Research HB-1 Mk2 izikhulumi (impedance 7.7 ohms ku-1 kHz) exhunywe esikhundleni sabamelana nomthwalo. Imiphumela yayifana nalokhu: 8.9 ama-watts ku-0.5% THD, 9.8 watts ku-1% THD.
04 ngo-08
Ukukhishwa kwe-TP30 Power Output
Ukuhlola i-TP30
Ishadi elingenhla libonisa ukuthi i-Topping TP30 ilinganiselwe ngaphansi kwezimo ezifanayo. I-trace eluhlaza ibe ngumthwalo we-8-ohm, umkhondo omfutho ube ngumthwalo we-4-ohm.
8-ohm umthwalo, zombili iziteshi eziqhutshwa
9.3 ama-Watts at 0.5% THD
10.3 ama-watts ku-1% THD
4-ohm umthwalo, zombili iziteshi eziqhutshwa
16.4 ama-Watts at 0.5% THD
17.4 ama-watts ku-1% THD
Phawula indlela i-TP30 ephumelela ngayo i-LP-2020A + noma ngabe imininingwane yayo iphansi? Iza nje ukukukhombisa - ama-amps asho lutho ngaphandle kokuthi izimo zokuhlola (izinga le-THD + N, zingaki iziteshi eziqhutshwa, impedance yokulayisha, njll) zinikezwa.
Qaphela nokuthi ngenkathi i-TP30 ephazamisa kanye nomsindo njengamazinga aphansi akuyona enkulu, kungcono kakhulu kuneLP-2020A +, ehlala ngaphansi kwe-0.5% emazingeni phakathi kuka-0.4 watts nomkhiqizo omkhulu.
05 ka-08
Ukuphakama kwempendulo ye-TP30 Frequency Response
Impendulo yephindaphindiwe yisilinganiso sokuthi ngendlela efanayo i-amplifier ikhiqiza yonke imisindo yomsindo, kusukela ku-bass kuya ku-midrange ukuhamba. Ukuze uthole i-amplifier, umphumela omuhle ulayini ophelile-ku-0 dB.
Ngibeka imiphumela ye-TP30 lapha kuqala ngoba ngakwazi ukuthola isilinganiso esivela kuso. Okuningi mayelana nemiphumela ye-LP-2020A + embi kulokhu kuhlolwa okukhuphuka.
Impendulo yephindaphindiwe, umthwalo we-8-ohm, u-ref. izinga le-2.83 volts (1 watt)
-0.32 dB ku-20 Hz
-0.50 dB ku-20 kHz
Iphutha lesilinganiso sesiteshi ku-1 kHz, 8-ohm load, ref. izinga le-2.83 volts (1 watt)
isiteshi esifanele +0.11 dB ngaphezulu kunokushiya
Futhi, akuwona umphumela omangalisayo, kodwa okwezithengisa kakhulu kumnandi.
06 ka-08
I-Lepai LP-2020A + Impendulo Yezimvamisa
Ngesikhathi ngizama ukulinganisa impendulo ye-LP-2020A + 's imvamisa besebenzisa izimpendulo zokulayisha engishilo ngaphambili, ngithole imiphumela engavamile. Ama-bass agxilile kakhulu, phansi -3 dB ku-76 Hz. Kodwa-ke, angizange ngibone ukungabi khona kwezinsizakalo lapho ngilalela i-LP-2020A +, ngakho ngacabanga ukuthi umphumela ungase ube ngenxa ye-idiosyncrasy ethile ye-LP-2020A + lapho kushayisana nabaphikisi bokulayisha.
Ngakho nganquma ukukala impendulo yemvamisa ngokuxhuma i-LP-2020A + kwesinye sezikhulumi zami ze-Hsu HB-1, ngibeka imakrofoni phambi kwayo, ngifaka impendulo evamile yemvamisa kwisipikha, bese ngiphinda ngesilinganiso ngisebenzisa i-Topping TP30 esikhundleni we-LP-2020A +. Ungabona umphumela kwigrafu ngenhla, lapho umkhondo ohlaza okwesibhakabhaka ubonisa umphumela nge-TP30, futhi umkhondo ohlaza uveza umphumela nge-LP-2020A +. Le miphumela inezilawuli zekholi ze-LP-2020A + ezivaliwe.
Impendulo yephindaphindiwe, umthwalo we-8-ohm, u-ref. izinga le-2.83 volts (1 watt)
+4.86 dB ku-20 Hz
0.00 dB ku-20 kHz
Iphutha lesilinganiso sesiteshi ku-1 kHz, 8-ohm load, ref. izinga le-2.83 volts (1 watt)
isiteshi sesokunxele +0.21 dB phezulu kunakwesokudla
Qaphela ukuthi impendulo ye-LP-2020A + empeleni -1.26 dB ngaphansi kwe-TP30 ku-30 Hz. Ngesizathu esithile, i-LP-2020A + inokuqinisa okumangalisayo kuma-Hz angu-20. Njengoba kunikezwe okuqukethwe okuncane kakhulu kwe-Hz kumabhayisikobho nomculo, futhi yilokho kuphela izikhulumi ezinkulu ne-subs ongakwazi ukukhiqiza i-Hz 20, akuyona into ozoyizwa. Akufani nalokhu okuncane okungakhipha ukukhipha okuzwakalayo ku-20 Hz noma kunjalo.
Ngokuyinhloko, i-timbre, noma ibhalansi ye-tonal, yalezi zimbini ezimbili zifana nokufanayo.
07 ngo-08
I-Lepai LP-2020A + Imiphumela Yethinta Yokulawula
Lezi yimiphumela yokulawulwa kwethoni ku-LP-2020A + - futhi, kulinganiswa ngokusebenzisa i-amp ngokusebenzisa isikhulumi se-Hsu HB-1 Mk3. I-trace eluhlaza okwesibhakabhaka umphumela wokuba izilawuli ze-bass ne-treble ziphenduke yonke indlela. Umkhondo obomvu umphumela wokuba ukulawulwa kwehlelwe yonke indlela.
Ukuphakama okukhulu nokunquma kokubili kungumyalelo we-10 kuya ku-12 dB, okuyingxenye enkulu kakhulu. Qaphela ukuthi lezi zilinganiso zithathwa ezingeni lokubhekisela kwe-1 watt. Uma uvala lezi zilawuli ngendlela ephezulu emazingeni wokulalela, i-LP-2020A + kungenzeka ingabi namandla anele okuletha ukukhushulwa okubonayo lapha.
08 ngo-08
Amanothi wokulalela nesiphetho
Ukulalela kwangempela
Lokho umehluko kuhumusha kanjani ekuhlangeneni nakho okulalelayo? Ukuze ngithole, ngaqhathanisa ama-amps amabili kumazinga wokulalela afanelana axhunywe nezikhulumi ze-Hsu HB-1. Ngaphawula into eyodwa nje: I-Topping TP30 ingasebenzisa inzuzo encane kakhulu. Ngadingeka ngiyiphendule yonke indlela ukuze ngithole ivolumu evamile uma ngisebenzisa i-iPod touch yami njengomthombo - yize i-HB-1 iyisipikha esikwazi kahle.
Ezindlebeni zami, i-LP-2020A + inobumbano phakathi kwe-midrange ne-low treble eyenza amazwi avele kancane kancane. Ngokuqoshwa kukaTerry Landry ngo-"Amazonas" kwezingcweti ze-saxophon ezinye zezingoma zomculo zokucubungula nge-latin zazincane kakhulu, cishe sengathi ziphukile. Noma kunjalo, uhla lwe-LP-2020A + oluphakeme oluhamba phambili luzwakala kancane, njengoba izilinganiso ziphakanyisiwe; i-TP30 izwakala ithambile kancane lapho ihamba ngokuqhathanisa. Kodwa ama-bass ajulile, anamandla athi "I-Train Song" kaHolly Cole evulekile futhi yazwakala kakhulu nge-TP30.
Ngokubanzi, ngingathi i-TP30 izwakala kangcono, nakuba bobabili banezinkinga nobuthakathaka. Ngicabanga ukuthi abanye bangase bakhethe umsindo we-LP-2020A +. Futhi ngicabanga ukuthi abanye bangase bangaqapheli umehluko.
Izwi Lokugcina
Kubonakala kusukela ezingeni lami ukuthi i-Topping TP30 yilokho engangikubiza ngokuthi " real amp ": Ungawuxhuma cishe kunoma yisiphi isikhulumi futhi uzoletha izinga lokulalela elihle futhi uhlanze umsindo.
I-Lepai LP-2020A +, noma kunjalo, ibonakala ifaka ezinye izingqinamba zobunjiniyela ezikuvumela ukuba zithinte iphuzu layo lentengo ephansi. Yenza ngokuyinhloko amandla anganayo ofanayo kumthwalo we-8-ohm njenge-TP30 ye-4x-eyabiza kakhulu.
Nansi isincomo sami: Thola i-TP10-MK4 uma uhlanganisa uhlelo oluyinkimbinkimbi yomsindo we-desktop noma igumbi lokubheja-bhajethi noma uhlelo lokulala. Thola i-LP-2020A + uma nje ufuna nje into eyenza umsindo ohloniphekile, njengokuthi uhlelo lwegaraji noma ukudlala i-lite jazz ekamelweni lokulinda.