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[TZEN]

尊敬的張老師您好:
音響展我們見過面,祇是您太忙未能多談,目前我使用ASR Basis Exclusive phono preamplifier, 配合Titani這顆唱頭,阻抗下在95歐姆,一直以來都非常非常滿意,但最近加了一顆 Gold finger ,阻抗應該在80歐姆,這下子慘了!因為 Exclusive phono preamplifier 可調最接近的阻抗是 66歐姆,及95歐姆,但用這兩組阻抗值聽起來都怪怪的,實在捨不得換這台唱放,請教尊敬的張老師,可以尋求原廠技術支援嗎?

[drkao]

可以用兩個 dip合併
數值是兩者並聯
即倒數相加再倒數
所以66和95合併會得到低於66的值
您要80
用95再加442約75
即dip3+dip5

[TZEN]

張老師,謝謝您!對於這部唱放絕對有信心,且大力推薦!

[drkao]

張老師,謝謝您!對於這部唱放絕對有信心,且大力推薦!

抱歉
我不是張老師

只是同為用家
假會雞婆一下
希望可以幫上忙

[TZEN]

抱歉
我不是張老師

只是同為用家
假會雞婆一下
希望可以幫上忙

還是非常感謝drkao兄,但有一個疑問請解惑,drkao兄所說dip3數值為47,dip5數值為221,〈原廠說明書〉均為您的一半,為何?對不起!不是學電子,音響又是新手,幼稚之處請包涵!

[上瑞張sir]

已遵矚寫信去ASR

非常感謝Dr. Kao 的回答. Dr. Kao 用唱頭平衡輸入的心得 很是受到尊敬 ( 敬禮! )

感恩的張
PS: 最近都有上My-Hiend, 但不知是何故 每次都要Keyin " 用戶名"???

[TZEN]

您要點自動登入啦!謝謝!待原廠回覆煩請再告知.

[上瑞張sir]

您要點自動登入啦!謝謝!待原廠回覆煩請再告知.

Mr Shafer 回應如下:
Hello Lee Ming,



thank you for the good news of coming order !



At first I need to know if balanced or unbalanced.





I calculated for balanced mode :



66+95+442 is definitely wring- gives 35 ohms.



95 + 442 is better gives 78 Ohms.



What means Dip 3 and Dip 5 to ON at both left and right Dip switch.









Just a sample for the calculation :



Balanced



For balanced you have to make same at adjustment at both dip switches.

It has to be 350 / 2 means 175 Ohms at positive and neg Input.



175 pos and 175 neg = 350 Ohms.



Will be 221 Ohms and 1 K Dip 5, 7 at both dip switches



R/1 = 47,000 ohms = 0.0000212 +

R/3 = 1,000 ohms = 0.001000 + ( Dip 7 )

R/4 = 221 ohms = 0.004524 ( Dip 5 )



Total equals = 0.005546163; 1/0.005546163 = 180 ohms x 2 = 360 Ohms







Or some thing more exact with 10 k in addition :



Will be 221 Ohms and 1 K and 10 k Dip 5,7,10 at both dip switches



R/1 = 47,000 ohms = 0.0000212 +

R/3 = 10,000 ohms = 0.0001000 + ( Dip 10 )

R/3 = 1,000 ohms = 0.001000 + ( Dip 7 )

R/4 = 221 ohms = 0.004524 ( Dip 5 )



Total equals = 0.005546163; 1/0.005546163 = 177 ohms x 2 = 354 ohms









Unbalanced



At unbalanced the negative input is short, so you need only 350 Ohms to adjust at left Dip switch



Will be 475 Ohms and 2,2 and 4,7 k Dip 6,8, 9 left row and right row only No. 12



R/1 = 47,000 ohms = 0.0000212 +

R/2 = 4,700 ohms = 0.000212 + ( Dip 9 )

R/3 = 2,200 ohms = 0.0004545 + ( Dip 8 )

R/4 = 475 ohms = 0.00212 ( Dip 6 )



Total equals = 0.0028162247; 1/0.0028162247 = 355 ohms









Best regards

Friedrich Schaefer

[drkao]

還是非常感謝drkao兄,但有一個疑問請解惑,drkao兄所說dip3數值為47,dip5數值為221,〈原廠說明書〉均為您的一半,為何?對不起!不是學電子,音響又是新手,幼稚之處請包涵!

所以原來您用RCA入

強烈建議您採平衡入
想辦法請人作一組RCA(唱臂)到平衡入(唱放)的訊號線
2正3負的接法
這樣才可發揮此機器的全部實力
也不要用轉接頭

用RCA入
大概只有一半不到的實力
而且很容易讓噪訊串進來
逼得您只能用高阻抗的檔位

等到您換成此接法
您會發現
阻抗的每個檔位都能聽
只是有些微的差異
不一定唱頭的建議值是您喜歡的
有人喜歡動態大一些用較高阻抗
有人喜歡嬌嫩的聲音用較低阻抗
並沒有所謂正確的阻抗值
只是看您喜好
而且別太大的增益會更安靜

[Leo Yeh]

很棒的資訊.......good~~~