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[#23] 【寫給新手的】- 前級放大器ABC    
经常把几个问题放在心里想一想,同少数人吹一吹,这是一个重要方法。
  ——《建国以来毛泽东文稿》第7册第10页
Spong
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220.xxx.xxx.75
2024-12-19 08:38
[#22] 【寫給新手的】- 前級放大器ABC    
preamp very important
tingmoon
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219.xxx.xxx.141
2024-12-18 12:23
[#21] 【寫給新手的】- 前級放大器ABC    
Kenny brother
As you said....
'I tried it a few times... with a Sony CDP (without any variable volume output) in the beginning, with Wadia and Accuphase later (variable output @ full volume).'
Then, what is your feeling?
is it good or bad?
Thanks for your comment
海誓山盟
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218.xxx.xxx.100
2005-10-25 22:05
[#20] 【寫給新手的】- 前級放大器ABC    
多謝教左我這個新手好多野
loubanny
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218.xxx.xxx.163
2005-10-25 10:24
[#19] 【寫給新手的】- 前級放大器ABC    
Nevertheless, a pre-amp makes a better sound performance from an EMM Labs (which I auditioned with a CAT SL-1/JL-2 -- best sound I have heard from a tube setup), and from an Accuphase/Wadia (which I owned), than without.

Kenny
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218.xxx.xxx.3
2005-10-25 00:15
[#18] 【寫給新手的】- 前級放大器ABC    
I tried it a few times... with a Sony CDP (without any variable volume output) in the beginning, with Wadia and Accuphase later (variable output @ full volume).

As I said, it depends on your speaker's sensitivity and your amp's gain.
Kenny
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218.xxx.xxx.3
2005-10-25 00:11
[#17] 【寫給新手的】- 前級放大器ABC    
The question was asking direct connect a CDP without level adjustment to poweramp. Well, if anyone think it is ok to do so, pls go ahead to try it yourself and share your experience here.
kcm
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218.xxx.xxx.136
2005-10-25 00:06
[#16] 【寫給新手的】- 前級放大器ABC    
Well, unless you have a sensitivity speaker, otherwise, many CDP's, including the famed Wadia 9 which has a 9 volt output, would not drive a low sensitivity speaker to clipping.
Kenny
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218.xxx.xxx.3
2005-10-24 23:50
[#15] 【寫給新手的】- 前級放大器ABC    
1. What is the sound level if I put the output of CDP direct into the power amp ? Will it too loudly ? The CDP is Consonance 2.3 (no level adjustment).
>> Never do that! Direct connect cdp output will produce way too loud sound that may damage your spk and/or your ear.

BTW, unlike Wadia & Accuphase, EMM Labs DCC2 has a built-in preamp inside, the preamp can be used as a standalone preamp and can take input from other source.

kcm
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218.xxx.xxx.136
2005-10-24 22:31
[#14] 【寫給新手的】- 前級放大器ABC    
It depends on 2 things. The sensitivity of your speaker, and also the gain of your amp. Say, if your speaker is 85 db/Watt, and your amp is 23 db gain (typical solid state amp), then the sound level should be reasonable.

Just note that loud sound does not mean the sound is of control & clear. A good pre-amp, with proper impedance matching outputs, would yield sound with proper authority and clarity that a stand alone CD player, even Wadia or EMM Labs or Accuphase, can't achieve.
Kenny
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218.xxx.xxx.3
2005-10-24 21:15
[#13] 【寫給新手的】- 前級放大器ABC    
I have 2 questions. Hope somebody can help to answer.

1. What is the sound level if I put the output of CDP direct into the power amp ? Will it too loudly ? The CDP is Consonance 2.3 (no level adjustment).

2. If I add an output transformer (coils with some gain) between the CDP and power Amp, then what is the sound level ?
hi-fi-小朋友
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203.xxx.xxx.71
2005-10-24 20:32
[#12] 【寫給新手的】- 前級放大器ABC    
Agreed to you fox-tan hing. Phono amp and RIAA is two different things. However, really respect Eddie hings motive.
com-buddy
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218.xxx.xxx.250
2005-10-24 14:45
[#11] 【寫給新手的】- 前級放大器ABC    
Quoting from your passage:

在黑膠碟("LP")時代,前級的地位可謂非常重要,因為唱頭的輸出非常小,根本不可能直接傳給後級放大器以策動揚聲器,所以她隨了要擔任以上弁鄍~,還要為唱頭再先作多一重放大,那便是稱為"唱頭放大器",英文為"Phono Amplifer",都可算是前級放大器的一種。

The correct function of the Phono section is to correct the compressed frequency respond curve base on the RIAA standard. It do provide extra gain vary from 30db and up for optimal amplifiaction. What you said can only refer to the function of "Pre-preamp" which provide extra gain for low out MC or MI cartridge.
foxtan
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203.xxx.xxx.110
2005-10-24 14:33
[#10] 【寫給新手的】- 前級放大器ABC    
各位兄弟,

玩音苀怞n有前級,前級不只是音量制,選擇制,5容,電阻,10倍放大那麼容易.前級主導全套音耵漫坋,音色平衡,後級主理力水及與喇叭的匹配.
好的前級買少見少,DIY亦不易,後級就簡單得多,靚OUTPUT加靚,用簡單姜竷h搭棚,好藄躞.
前級就複雜得多,靚料亦難求,好的古董前級,如馬1 & 7,400CX往往見光死(如狀態完美!),被識貨者搶奪.
新机Herron,Audionote等亦多賣天价,由此可見,前級有其存在及實用价值,不應忽g.

Yuhin
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219.xxx.xxx.136
2005-10-24 14:16
[#9] 【寫給新手的】- 前級放大器ABC    
how about passive preamp?
erickwm2000
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218.xxx.xxx.51
2005-10-24 12:28

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