review33.com: 影音天地: 音響伴我四十年

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[#702] 音響伴我四十年 Alan, you typed fast than me. Thank you for your kindness and geneorsity. If i need your help later, i will not hesitate to contact you.		jcml 正式會員 218.xxx.xxx.46	2006-09-09 23:51

[#703] 音響伴我四十年
Pilotrol Hing:
Thank you very much for your advice. As do not know much about maintenance work of electronics, I tend to stick to current products or used equipment of a few years old. I appreciate that vintge gears are sweeter. I also have the feeling that vintage gears are for the hi- hands.

Mr Lip:
Grateful if you could spare a minute or two to give me some advice on the input impedance of the solidstate power amps which at around 10K ohms may be a bit low to match tube amp such as ARC LS8. My questions were:

For listening to 70% vocals/jazz and 30% pop/rock in a room of about 200 square feet [actually about 300 sq feet], I wish to improve the sound density of my system by changing my 50 Watt tube power amp to a solid-state amp of about 200-250W at a budget of about HK$30K (for a new or used amp). I am considering PassLab X-250.5 and McIntosh MC252. However, these two amps' input impedence is only about 10K ohms which is lower than my exising tube amp's 100K ohms (that is 10 times). I have read that low input impedence of power amp could potentially be a problem. I am using JMLab Be speakers with 89dB/m which should not be difficult to drive. As I am also using a passive resistive pre-amp at the moment, I will get a 2nd-hand ARC LS8 pre-amp from a friend to go with the new power amp. Please give me some advice on the above-mentioned power amps and any other alternatives at my budget. Thank you in advance...

I wish to add that I aim to use tube pre-amp with solid-state power amp to get smooth vocals plus a bit of bass density for occasional pop musics. Since my friend has offered to sell me his LS8 at a very good price, I wish to get it to allow more money for a new power amp. Thank you again...

dannyson33

正式會員
219.xxx.xxx.41

2006-09-10 08:17

[#704] 音響伴我四十年
dannyson33,
Sorry for jumping in, although "to use tube pre-amp with solid-state power amp to get smooth vocals plus a bit of bass density for occasional pop musics" is a common assumption, the result is usually unpredictable & not always true. I had the same simplified expectation before & matched a CJ tube preamp with a Ayre SS poweramp with mediocre result.
I'm sure certain other tube pre + SS power combinations are highly satisfactory, but you must try instead of assuming.

nicknick

正式會員
219.xxx.xxx.22

2006-09-10 08:39

[#705] 音響伴我四十年
Dannyson33 兄,

我記得當我用Passlabs XA-160 配 ARC Ref2 MKII 時..由於passlabs的輸入阻抗只有10Kohm, 我的音壓沒法超越 10點位, 而旦整體表現很'搶', 後來才從Stereophile 得知passlabs配膽前級是要小心選擇, 如果output gain 在12dB以上會有失控現象. 詳細的技術數據我無法蝯, 只知道passlabs後級是很挑前置的.
建意到一些Passlabs同好會參考他們的經驗.

你用的是JM Labs, 是可膽可石..看你的口味罷, 如果想在30K之內...Jeff Rowland, ARC VT, Cary..都是較厚聲後級, JM Labs無必要用剛猛型級級, 很多用家都只用幾十walts謄機來推JM Labs落地.

belenlip

正式會員
68.xxx.xxx.88

2006-09-11 09:26

[#706] 音響伴我四十年
Dannyson33 Hing,

Just to share. I matched McIntosh MC352 with a tube pre-amp once. The result is no good, and the sound is very 猛. Soft Seprano sounds like fighting. Be very careful!

Also as Lip Sir mentioned before, the dampening factor of MC is not large. It cannot control my THIEL 2.4. Even the Tube Monoblock that I use now has better control than MC. But I have heard in the showroom that the whole suit of MC sounds much better. Maybe matching MC252 with its own pre-amp could help!

listener

正式會員
170.xxx.xxx.104

2006-09-11 18:21

[#707] 音響伴我四十年
Passlabs 是低阻抗後級10Kohm, 一般標準是47kohm以上, 所以對前級也較為吃力, 因為後級是被前級所驅動的, 如果低效率的後級會對前級做力壓力. 其原理一如低效率喇叭對後級的負聽[重一樣.
但不要誤以為Passlabs是爛後級, 德國的MBL也只有5Kohm的輸入阻抗, 此類低效率後級是有效降底雜音, 容易得到更寧靜的背景.

belenlip

正式會員
68.xxx.xxx.88

2006-09-11 19:18

[#708] 音響伴我四十年
Mr Lip and other hifi brothers:

Thank you very much for your valuable advice and sharing your actual experiences.

I think I may have to drop the idea of getting the used ARC LS8 tube preamp as it can limit the choice of power amps. I note that LS8 requires a recommended load of 60K ohm and 100pF (minimum 20K ohm and max 1000pF). The low input impedance of PassLabs x250.5 (10K ohms) and McIntosh MC252 (10K ohms) may not match the LS8 preamp. Although it is possible to use a short interconnect with low capacitance to reduce the problem, this solution may not be ideal.

So, back to the drawing board, I may consider integrated amps, or pre/power amps of the same brand to avoid matching problems.

May I ask your opinions on whether there is any need to have auto transformers as in McIntosh MA6900 to drive my JMLab speakers well? Would the cheaper version such as MA6300 or MA6500 without auto transformers be good enough? Thank you again...

dannyson33

正式會員
219.xxx.xxx.15

2006-09-12 00:33

[#709] 音響伴我四十年
問題不在前級(LS8).而是在後級. 10kOhm 是比較少見, 如果合併機可以考慮 Jeff Rowland, Accustic arts, ARC..都很夾Jm Lab..

belenlip

正式會員
68.xxx.xxx.88

2006-09-12 02:08

[#710] 音響伴我四十年
belenlip 兄﹕

心急想知道dCS效果如何?????

*Mikos*

正式會員
202.xxx.xxx.123

2006-09-26 20:35

[#711] 音響伴我四十年
"Passlabs 是低阻抗後級10Kohm....德國的MBL也只有5Kohm的輸入阻抗"

Agree everything belenlip said. Just to supplement, IMO, both Passlabs and MBL are designed for balance input. Their RCA are just for adoptable for widely choice of preamp, not from performance perspective. Note their balance input impedences, both have quite healthy ~20Kohms. Adquate for most well designed balanace preamp.

mills

正式會員
218.xxx.xxx.178

2006-09-26 21:23

[#712] 音響伴我四十年
dCS 和 Lamm 前後級開聲近100小時, dCS組合的確沒有令我失望, 當然以這個價位..不好是不行的. 和以前我所用過的CDP來比較, dCS最大分別是那份鬆容不迫, 氣定神閒的姿態, 無論多彭拜的動態, 攝人心神的高頻..或快如閃雷的低頻..聽者都是在沒有任何壓力下享受. 這種舒泰感覺是與聆聽LP時一樣...

自從這套dCS進門之後, 我本以為從此只買SACD, CD則可免...但事實卻又不是我想這樣, 很多耳熟能詳的CD, 在DSD的幫助下有脫胎換骨的表現, 在能量感中最為明顯, 高和低伸展度極高, 低頻沉, 實, 快. 歌者的輪廓是觸手可及, 高頻部分更是精髓所在, 通透得如白雪晶瑩, 泛音之中感到有厚度, 色士風的銅管質感很:烈. 整體細節豐富, 人聲中的唇齒相磨, 運氣轉舌, 就是那蔓u實.

在重播SACD時..這與從前的 Esoteric X01 是兩種味道, dCS 會使聽者忘記所播的是SACD, 雖然在頻帶寬闊之優勢下理應會有被剌激的感覺, 但dCS就是不留痕積讓人不自覺地享受SACD優美音域. 自然, 不誇張, 無任何添加劑而又能感覺到SACD的:勢. Esoteric X01 反觀是鋒芒畢露, 處處逼人...易生疲累.

PCM 轉成 DSD 這個弁鄖洃@張CD能與SACD爭長短, 這也是dCS的最大賣點, 我手存的數百張CD也不會被雪藏, 不過我發現這個從44.1khz 轉到DSD的優點並不合用於XRCD ! 它的表現有如脫彊野馬, 高頻失控, 人聲咀型極大...但如果棄用DSD..改用原本PCM而不作升頻, 一切回復正常.

結論: 一些從前被遺忘的CD..通過IEEE1394的DSD, 今天也可重見天日, 單是這一點就夠我感動了, 再加上dCS那份柔情中不失分析力的表現是獨樹一格, 我們玩音穻h年都清楚有個定律, 要音色就要棄細節, 分析力越高, 音色越理性...能夠感性和理性兼備之音源系統, 除了高質素的類比(LP)組合外, dCS當之無.

Lamm Pre Amp/ Power Amp...
其實Lamm在過去段時期幾次擦身而過, 很多時機和因素而未有用上, 但我對Lamm的注意已經有一般日子, 主要係對Lamm的執著同認真所折服, 我一向買器材大多睇review同用家意見. 從前購買我對ATC的加拿大買家, 家中就是用Lamm...而且從美國兩大天書文中對Lamm也是推崇備至. 說它平宜..如果新机算的話, Lamm 的 L2 Ref 加 M2.2 與 Mark ML32/H33 是價位相近. 但從二手市場來算, Lamm 的確是非常低用.

Lamm L2 Reference 前級我認為算是頂級制作, 它是贏口卑但輸名氣, 十多年來 Lamm 鮮有廣告和吹谷...我相信HiFi雜誌選文讚評有部分是廣告所至, 但以Lamm的廣告出現率也能受到TAS和Stereophile的大篇副讚, 甚至評L2 Ref的表現和Mark ML32 分庭抗禮..要知道 Mark仔每年在Stereophile落的廣告是大數目呀.
另一現像..美國每年的CES... Lamm都是常客, 主要是被很多喇叭品牌相中要求借出器材作推動旗下喇叭作示範. Avalon 同 Wilson Audio 是長期合作伙伴.

事實証明..我的眼光無走漏, 論外型 Lamm 完全唔合格, 以我的個性要放幾舊黑卒卒在視線之內, 除非有超凡入聖的表現...論內涵...Lamm 的表現是可圈可點, C4 在M2.1 的驅動下..其低頻是我最欣嘗的, 大鼓的震憾感和鼓皮聲, 全頻起動的:勢的一浸接一浸, 這時我對於C4又有另一番見地, 這些改動是XA-160所欠缺的. 中頻人聲也是一絕, 歌者呎碼比從前細了很多..不只聽其歌也能感受到她的存在.

Lamm Ls Ref 是全平衡線路, 但只食RCA...據Stereophile 解釋, " the L2 uses "truly balanced, fully differential" circuits, I was puzzled why there are no balanced XLR inputs. "I ground the negative input on the RCAs, so I use only single-ended inputs, very simple."

嚴格講Lamm L2 Reference 不算膽前級, 5只膽都在分離Power Supply內, 推動同放大也是晶體執行, 當一套Mark 32/33H 貴到有些物非所值時, Lamm 是一個正確選擇.

接下來...要在線材上開刀了, 包括電源系統都要重新評估....希望可在年底前全部完成.

今天原用的Tara Labs The One 喇叭線巳退下, 改用它的旗艦 Omega..希望能夠更上層樓..
報告容後再評.

belenlip

正式會員
68.xxx.xxx.88

2006-09-26 22:26

[#713] 音響伴我四十年
belenlip 兄﹕

多謝分享﹐dCS果然厲害﹐其實之前已聽過不少高手大讚dCS勁﹐尤其是二手購入非常﹐今次再看埋你的分析﹐就更加增強日後有機會(當然係講緊$$$)必然買返來玩下。

聽說sony已不再供應"頭"給dCS﹐所以dCS多了個服務向用戶提供轉換"頭"的服務﹐新頭是philips﹐看外國雜誌話轉換後的反應非常好聲﹐唔知belenlip兄的轉盆是否philips????

*Mikos*

正式會員
202.xxx.xxx.26

2006-09-28 00:54

[#714] 音響伴我四十年
我自己也之前聽過幾次dCS解碼﹐發覺線材配合也要相當講究﹐因我個人覺得(可能是我錯都唔定)如果搞得唔好﹐dCS的HiFi元素很高以及好﹐不過缺乏小小音樂味!!!

不過無可否認聽dCS真的很舒服﹐耐聽。

*Mikos*

正式會員
202.xxx.xxx.26

2006-09-28 01:00

[#715] 音響伴我四十年
Mikos 兄真是無事不通..

我用的Verdi已由代理upgrade到最新software和更新Philips頭. dCS對電源部份敏感, 但那對接前級的訊號線尤其重要, 配得不宜, 前朮伝. 不過其他的IEEE1394, Wordclock 同軸之類..用跟機也可, 它只是傳送數碼.0101010101 不用深究.

belenlip

正式會員
68.xxx.xxx.88

2006-09-28 02:12

[#716] 音響伴我四十年
我比較喜歡philips頭﹐所以也估計非常好聲﹐因為聽過以前的dCS都是用上sony頭。

*Mikos*

正式會員
202.xxx.xxx.198

2006-09-28 02:25

[#717] 音響伴我四十年
belenlip兄及網友們:我希望你們能幫忙,請告我知,那間唱片公司出品的廣東小曲cd錄音好的,曲目要有菪x秋思,Thanks!

sounddragon

正式會員
218.xxx.xxx.137

2006-09-28 23:26

[#718] 音響伴我四十年
Fim 秋思...另外 Hugo 出品的國產小品也是不錯的錄音.