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Kornurts
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Kornurts

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PostSubject: dB or desibel   dB or desibel Icon_minitime21/10/2010, 9:34 pm

bro skalian yg dkasihi..sy mau tnya ne..desibel tu apa jg?
ukuran kkuatan ssbuah sound ka apa?
klu kkuatan woofer tu diukur mlalui desibel ka?
hrp dpt bg info bro2 yg pro2 skalian..tq..
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finalazy84
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finalazy84

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime21/10/2010, 10:00 pm

decibel/db ni unit yg digunakan untuk mngukur level kekuatan bunyi.untul tau SPL guna db scale/meter untuk mngukur kekuatan bunyi.tdk semestinya woofer sja.smua yg mngeluarkan bunyi pn boleh diukur guna mesin ini dn unit yg diguna ialah db.macam klau electrik slalu guna volt tau watt.klau bunyi db/decibel
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Kornurts
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Kornurts

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime21/10/2010, 10:10 pm

oo..bgtu...stiap speaker tu ada ukuran bd dia jg ka bro?mksudnya yg boleh capai brp db?
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finalazy84
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finalazy84

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime21/10/2010, 10:37 pm

biasanya d manual ada tulis tu.tpi tdk reliable tu.dlm erti kata lain klau woofer A di manual tulis 90db, woofer B 100db kita tdk buli buat andaian woofer B lebih kuat dari woofer A dngn hanya brpndukan nilai db dlm manual.paling tepat klau kita test guna db meter. lgipun bnyak faktor yg boleh mengubah kekuatan bunyi woofer atau peak frequency.stiap woofer ada peak frequency masing.tdk sma dngn model lain.jdi klau mau main SPL kena cari freq yg ngam kmudia boost ini freq.box pun kena buat yg khas untuk ngam freq yg kita target ni.

p.s. jn tnya macam mna mau buat box.hehe sbab sa tatau. otai2 sja yg tau.tpi buli juga cari d internet.ada calculator tu.tpi kena tau spec itu woofer la. macam Qms,Qts,Fs dan lain2.
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Kornurts
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Kornurts

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime23/10/2010, 10:30 am

uiii...rpanya bkn snang jg mo main sound ni..aduiiii...pning2...bro yg peak frequency tu mcmmna tu?apa yg prlu dgunakan utk boost ni frequency? Suspect
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finalazy84
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finalazy84

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime23/10/2010, 11:44 am

kadang2 ada monoblock yg suda build in parametric equalizer.ini par eq buli set cntre freq dia mau brapa.lpas tu bleh adjust Qfactor untuk set itu slope tajam atau tidak.then buli boost itu freq.

ada juga preamp yg buli buat macam ni..
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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime23/10/2010, 12:11 pm

db ni asal dari kajian telefon oleh alex graham bell..desi maksud 10..bel maksud nama org tue..diukur berasaskan pendengaran manusia..1 bel sgt tidak dgr..so dorg letak 10B atau 1dB iaitu bunyi paling slow yg telinga manusia mampu kesan..bunyi ni pula hasil dari getaran lalu membentuk gelombang melalui udara..getaran sebabkan tekanan udara bergerak lalu sampai ke telinga kita sebabkan kita dgr bunyi..tambah kuat gelombang yg sampai..tambah kuat kita dengar..tambah laju getarannya, tambah tinggi frekuensi bunyi tue..standard db diukur pada tekanan udara normal iaitu 1atm..
20db = bunyi org bisik2..60db standard org bercakap..70-90 db bunyi kereta/lori/traktor..100-110db = disko.. 120db bunyi kapalterbang berlepas..128db telinga kt akan bedengung kalu dgr..130db keatas boleh rosakkan telinga..133db bunyi senapang..160db keatas mampu membunuh manusia..170db=1psi..181.4db rekod dunia=letupan 1tan TNT dari jarak 200kaki..183db paling maksimum bole disukat takat ni oleh termlab db tester..184db mampu pecahkan dinding konkrit tebal 1kaki.. 194db=maksimum bunyi dgn medium udara=spl 1atmofera=wujud ruang vakum antara gelombang..
menarik bukan..
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Kornurts
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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime24/10/2010, 12:52 pm

finalazy84 wrote:
kadang2 ada monoblock yg suda build in parametric equalizer.ini par eq buli set cntre freq dia mau brapa.lpas tu bleh adjust Qfactor untuk set itu slope tajam atau tidak.then buli boost itu freq.

ada juga preamp yg buli buat macam ni..

pre amp ni yg ada dipusing2 tu ka bro?macam equalizer tu?..
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AIRpulse
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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime7/11/2010, 7:33 pm

fina
mahal ka db meter ni?
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finalazy84
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finalazy84

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime7/11/2010, 7:49 pm

indatau owh bro mhl ka tdk...tdk pernah nmpak orang jual lgi...hehe

kornuts: ya preamp ni lebih kurang equaliser la.dan untuk kasi lebih bnyak RCA punya sambungan klau player cuma ada 1 pasang
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Kornurts
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Kornurts

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime7/11/2010, 9:12 pm

oo...klu yg dia tulis d pwr am tu (mosfet) tu bro apa la mksud dia tu..cma skadar nma atau pwr am tu dikhususkn utk ssuatu?
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ckmoy007
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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime8/11/2010, 9:11 pm

mosfet ni type of power supply di amp. paling penting tengok RMS di amp dulu, mosfet atau tdk belakang kira la tu.
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Kornurts
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Kornurts

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime11/11/2010, 1:54 pm

okay bro..klu mo psang dua pwr amp bah misalnya pwr amp mid n pwr amp woofer,mcmmna tu smbungan positif dr btry tu?mo tarik kabel positif masing2 ka dr batry atau ambl sja dr positif pwr amp yg satu tu?
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zeus245
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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime11/11/2010, 2:31 pm

kalau mau pasang 2 amp, beli 1 cable besar contoh 4gauge, the belakang kasi voltage distributor split kasi 2, then dari sana baru pasang 8 gauge, 1 pegi amp mid, satu pergi amp woofer
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Kornurts
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Kornurts

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime11/11/2010, 2:44 pm

voltage distributer split ni satu benda ka atau kaedah wiring?yg kabel dr batry p pwr am tu ada sda fuse yg bulat2 bsar tu kn?perlu lg pasang fuse ka yg sbelum fuse bsar tu?
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finalazy84
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finalazy84

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PostSubject: Re: dB or desibel   dB or desibel Icon_minitime11/11/2010, 5:04 pm

4awg dari battry - fuse - distribution block - fuse - 8awg.

tarik asing2 pun buli.setiap cable mesti ada fuse..

setiap perubahan cable size, klau cable mengecil kna ada fuse. cuba ko google bro.bnyak tu site yg kasi letak diagram lgi.

mengecil mksudnya dari battry - 4awg-fuse-ditibution block - 8 awg (cable mengecil) - (fuse) - 8 awg

klau membesar contoh 4 awg - 0awg tak perlu lgi fuse kedua.
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