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[前級] 英國之貴族 Bespoke Audio Passive preamplifier 前級到左VOLENT Audio

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發表於 2016-10-22 14:20:11 | 顯示全部樓層
本帖最後由 AS881 於 2016-10-22 14:25 編輯
dominiquetu 發表於 2016-10-22 14:06
All MFA are using copper as their standard configuration. Silver are all special ordered and cost  ...


But it seems all of us would buy with silver transformers instead of copper one, isn't it? So for the current baby reference or version 2, assuming they are the flagship one, are they in silver transformers?
Their newer model doesn't told whether they uses silver or copper one now.
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發表於 2016-10-22 14:58:34 | 顯示全部樓層
ccli1996 發表於 2016-10-22 14:09
按我理解,passive pre-amp不會用電,得幾件主要元件,Selector,Volume制及輸入與輸出嘅阻抗匹配(如變壓器 ...

我都不明白……及太貴玩不起
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發表於 2016-10-22 16:00:06 | 顯示全部樓層
本帖最後由 ccli1996 於 2016-10-22 16:01 編輯
curtis9797 發表於 2016-10-22 14:58
我都不明白……及太貴玩不起


呢部passive pre-amp,睇嚟係冇傳統電阻分壓嘅Volume制,與變壓器合而唯一,關鍵應該都係係隻「牛」樹
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發表於 2016-10-22 16:37:18 | 顯示全部樓層
For me

I use the MFA baby ref v2
And have directly compared with bespoke for a few times

Yes both are very good passive pre amp with speed and resolution comparable to pre amp 2 times of its price
Both are made in order by hand in England

I would describe the baby ref 2 is more elegant and graceful sound

As for bespoke, it has a slightly fuller body and richness
Especially in songs involving male deep vocals

Yet I would say both are very good pre amps and deserves a lot of praise

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發表於 2016-10-22 16:47:57 來自手機 | 顯示全部樓層
ccli1996 發表於 2016-10-22 14:09
按我理解,passive pre-amp不會用電,得幾件主要元件,Selector,Volume制及輸入與輸出嘅阻抗匹配(如變壓器 ...

咪就在於個source,個source要全面地好

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發表於 2016-10-22 17:25:15 | 顯示全部樓層
AS881 發表於 2016-10-22 14:20
But it seems all of us would buy with silver transformers instead of copper one, isn't it? So for  ...

AS881 hing,

All flagship you have mentioned; i.e. MFA Baby Reference, MFA Baby Reference v2, are default using copper transformer .

I am using MFA Reference (大家通常稱它為"大Reference"), you can still order this from MFA and the cost is £7.5k, also default using copper transformer.


I have another MFA Silver MKII, and this is the only default with Silver transformer.


Both advise from MFA and Bespoke is ...... unless you have a system that is already achieving very good sonic result with all the way Silver components, there is no need to use a passive preamp with silver transformer.

Hope this can help and feel free to ask if you have other questions.

With best regards,

Dominique
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發表於 2016-10-22 17:38:23 | 顯示全部樓層
mahi 發表於 2016-10-22 16:47
咪就在於個source,個source要全面地好

mahi hing,

I think you have only answer 50% of the questions.

You are right, the quality of the source is very critical. The good news is for most of the modern hifi sources today; i.e. CD-Player or High-end DAC, they all have a very high voltage output stage which is already strong enough to drive a poweramp already.

Beside the quality source, the beauty of High-end passive is...... their sonic performance is actual better than most of the high-end preamp ! ! ! This was really really surprised me when I start using passive pre-amp 10 years ago ! !

Dominique

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發表於 2016-10-22 18:19:38 | 顯示全部樓層
blau.vol 發表於 2016-10-21 13:13
Hi Ballgor hing,

好好聲..... 我地有同MFA 所有型號比較呢..... classic,  baby ref1 , baby ref2 ,  ...

Very tempting! Could you PM your price? Thank you!
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發表於 2016-10-22 21:25:03 | 顯示全部樓層
本帖最後由 ccli1996 於 2016-10-22 22:51 編輯
dominiquetu 發表於 2016-10-22 17:38
mahi hing,

I think you have only answer 50% of the questions.


So the principle of using passive pre-amp to achieve good sound will rely on
1) having a good source output (means that its analogue output voltage amplitude is large enough to drive the power amp stage directly)
2) avoid using the digital control volume of the source (e.g. DAC or CD player) analogue output.  Either to use a fixed analogue output from the source (if it has) or to set the variable source output at its maximum output amplitude.
3) the source output signal will pass through the critical component in a passive pre-amp - Transformer - which act as the combination of Volume control & Output impedance matching function

To my understanding, the "heart" of a passive pre-amp will depend on the audio performance of the expensive transformer integrated with volume control function VS the digital control volume from the source itself if the source output is connected directly to the power amp
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發表於 2016-10-22 23:18:29 | 顯示全部樓層
To check whether your system is suitable to use a passive preamp, you can use the following equation:

Voltage Gain (Av) = 20 * Log (Vout/Vin)

Vin is input voltage required to drive your power amplifier to max power.
More info here

Basically, if the output voltage of your source is greater than the min voltage required to drive the power amplifier to max power, then you may benefit from a passive preamp cos there is already too much gain in your system.

The beauty of a TVC preamp is as you lower the volume on the preamp, the output impedance of the preamp goes down as well. On the other hand, if you turn the volume to unity, the output impedance of the TVC preamp will be the same as your source.

Finally, TVC preamps are really good for ppl who has too much gain in their system already, hence no need for active preamps and like to listen in low volumes.

The first time I had my Classic V2 plugged in and playing at modest level, I could not believe how much more details I was listening.  


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發表於 2016-10-23 00:25:02 來自手機 | 顯示全部樓層
ccli1996 發表於 2016-10-22 21:25
So the principle of using passive pre-amp to achieve good sound will rely on
1) having a good sour ...

你誤會了我意思,source要好係指質素要頂,一對牛係唔會玩魔術平庸source變上菜,因爲無源本身係通透和少添加。

但如果有好的供應,通過無源牛就會和後級工作得更如魚得水!

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發表於 2016-10-23 00:26:59 來自手機 | 顯示全部樓層
但要補充當然不是是但搵隻牛就可以係好的無源前級
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發表於 2016-10-23 00:31:54 來自手機 | 顯示全部樓層
sgb 發表於 2016-10-22 23:18
To check whether your system is suitable to use a passive preamp, you can use the following equation ...

active pre都有係variable gain或可以調到gain=0,但佔少數,我估多少係因為設計師都希望部前有d自家音色特點
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發表於 2016-10-23 00:37:21 | 顯示全部樓層
mahi 發表於 2016-10-23 00:25
你誤會了我意思,source要好係指質素要頂,一對牛係唔會玩魔術平庸source變上菜,因爲無源本身係通透和少 ...

Absolutely!

TVC or Autoformers, with the ilk of MFA and Emia, they are brutally revealing of your source!
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發表於 2016-10-23 00:44:37 | 顯示全部樓層
mahi 發表於 2016-10-23 00:31
active pre都有係variable gain或可以調到gain=0,但佔少數,我估多少係因為設計師都希望部前有d自家音色 ...

One of my reasons going down the passive preamp route was to reduce colorations in the chain.

One active pre comes to mind with variable gain is the Pass Aleph P. It is one pre that I really want to try in my system.
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發表於 2016-10-23 04:04:06 | 顯示全部樓層
dominiquetu 發表於 2016-10-22 17:25
AS881 hing,

All flagship you have mentioned; i.e. MFA Baby Reference, MFA Baby Reference v2, are  ...

Thanks Dominque for your info! Isn't the MFA reference a discontinued model?
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發表於 2016-10-23 11:16:58 | 顯示全部樓層
AS881 發表於 2016-10-23 04:04
Thanks Dominque for your info! Isn't the MFA reference a discontinued model?

Hi AS881,
It is a discontinued model but seems MFA still accept custom order on MFA Reference right now.
Regards,
Dominique
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發表於 2016-10-23 11:21:05 | 顯示全部樓層
AS881 發表於 2016-10-23 04:04
Thanks Dominque for your info! Isn't the MFA reference a discontinued model?

This is Ben Lau's thread for introducing and discussing the Bespoke passive pre-amp that he is selling.
I do not want to post here to talk about my own experience with active and passive pre-amps.
If someone starts a new thread on passive pre-amps in general, I will post there.
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發表於 2016-10-23 12:25:36 | 顯示全部樓層
momei 發表於 2016-10-23 11:21
This is Ben Lau's thread for introducing and discussing the Bespoke passive pre-amp that he is sel ...

Agree with momei hing.

By the way, if anyone interested on my MFA Reference, please pm me.

I will also move to Bespoke family ! ! !
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發表於 2016-10-23 12:56:08 | 顯示全部樓層
Yes, it seems hijacking the post of others. Let's t walk in a new thread if we would like to....
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