胆前夾石後如何配對

LKM

各位 CHING 請問胆前夾石後(兩者多數會用不同品牌)耍留意那些技術指標才可配合使用呢? 例如輸出/輸入阻抗要怎樣才算匹配等等?

Simcity

各位 CHING 請問胆前夾石後(兩者多數會用不同品牌)耍留意那些技術指標才可配合使用呢? 例如輸出/輸入阻抗要 ...
LKM 發表於 2011-6-17 18:06

LKM C Hing, I am also using  "胆前夾石後" :)

LKM

LKM C Hing, I am also using  "胆前夾石後" :)
Simcity 發表於 2011-6-18 00:11

    兩部都是美國機, 是否味道相近就可配對, 不用考慮其它規格??

LKM

LKM C Hing, I am also using  "胆前夾石後" :)
Simcity 發表於 2011-6-18 00:11

SIMCITY CHING 如用2部不同牌子或國家的胆+石要留意甚麼呢? 好像 ARC REF 5 配 LUXMAN M800A 推 B&W800D 匹配嗎?

nagramen

胆+石要留意 the output impedance of preamp and the input impedance of power amp. If input impedance of power amp is low (for axample, 20K ohms for XLR input in PassLabs) then selection of a suitable preamp needs to be careful, otherwise it can have power attenuation and hi-frequency roll-off.  But I am not a hi-hand. Hope other c-hings can explain the details.

However, I use a simple rule:
- Input impedance of power amp should be high (e.g. at least 47K ohms for RCA and at least 20K ohms for XLR);
- Output impendance of preamp should be low (e.g. no more than 100 ohms, yes, one hundred ohms!)
Hope other hi-hand c-hings can explain more.

This link may help:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1253079731

Simcity

兩部都是美國機, 是否味道相近就可配對, 不用考慮其它規格??
LKM 發表於 2011-6-18 01:17

LKM C Hing, you need to try it on your own.  No one can really tell you the answer :)

BTW, I have also owned the Ref5 preamp.......

LKM

回復 5# nagramen


    Ching, thank you for your advice.

LKM

回復 6# Simcity


    Simcith CHing, thank you very much!

A20

師兄
我之前玩過 cj premium 16 胆前 + chord 石後 (1200c, 已經停產了)
夾對 wilson benesche act 1, 好聲得好緊要.
雖然係中級機, 但音埸又深又闊, 成間屋都充滿音樂. 中高頻彷彿打晒水晶臘咁. (當時線材全部用銅線)
播鄧麗君好聽, 播classic考動態一樣過關. 有速度有音色, 中頻滴水一般. 反而夾返同廠前後級都沒有如此魅力 (chord+chord, cj+cj).
夠竟點夾至好 ? 最好都係親耳聽過先決定.

Simcity

夠竟點夾至好 ? 最好都係親耳聽過先決定.

A20 發表於 2011-6-18 15:52

Yes, that's absolutely true, A20 C Hing :)

hakman

-The output impedance of the preamp should be not more than 1/10th of the input impedance of the power amp.
-The combinations of preamp/poweramp combo. have the similar sound characteristics.

Most of the tube preamp say, 6922 have too high an output impedance.The traditional solution is to add a buffer stage in the circuit (as already built in CJ preamp).
Secondly, the poweramp has the the input impedance select.
Finally, the preamp and poweramp have compatable outputs/intputs. ie. single ended (RCA) or Balanced (XLR).

Good luck!

LKM

-The output impedance of the preamp should be not more than 1/10th of the input impedance of the pow ...
hakman 發表於 2011-6-18 19:38

    多謝指點

nagramen

"The output impedance of the preamp should be not more than 1/10th of the input impedance of the power amp"
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Agreed.  I suggest testing the actual combo before drawing a concrete conclusion.

BTW, my gears for your reference:
- Nagra PLL (output impedance = 60 ohms)
- PassLabs x350.5 (input impedance = 20K ohms for XLR)
- Ratio = 60/20000 = 0.003 (much less than 0.1, very good match)
Learned this from Lip Sir's thread a couple of years ago.

hakman

Because of budget restrictions in playing  Hi-Fi, I need to narrow down to the “old” gears.

My preamp is Audio Research Reference one MKII with Output impedance: 400 ohms balanced, 200 ohms single-ended, 20k ohms minimum load recommended.
My poweramp is Jeff Rowland 5 with Selectable Input Impedance 100k, 20k, 600 ohms.
I switch my poweramp to the highest Input Impedance.

happy listening^^

nagramen

hakman c-hing:
AR Ref One MK2 is very good woo!
Your ratio = 400/100k = 0.004

My Nagra PLL's output impedance is very low at 60 ohms (not 600).

hakman

hakman c-hing:
AR Ref One MK2 is very good woo!
Your ratio = 400/100k = 0.004

My Nagra PLL's output ...
nagramen 發表於 2011-6-18 23:56

Nagra PLL is a nice preamp.