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[#1] ATC SCM40 重生記, 被魔怪狂摩[改]    
聲明 : 原廠器材絕對擁躉, 認為原廠器材都是十全十美, 不可改動者, 可跳過此文, 不必浪費時間˳

過去幾年, 已有多對喇叭遭毒手分屍改造後得以重生, 包括ProAc D15兩對(附註甲), D18一對及仿1sc 一對(附註乙), AE Aegis 1書架一對, Quad 11L書架一對, 韓國製仿B&W書架三隻, B&W N804座地一對[只改低音部份] (附註丙) ˳

2014年11月入了對二手[可能n手?] 舊款ATC SCM40˳ 將它解體取出分音器, 準備訂購高質零件重做, 一看即時又喜又愁˳

愁的是只單聲道已有24個元件, 6個電感綫圈, 6支電容及12支電阻, 要全部換好料的話, 荷包必然重傷˳ 還好只是訊號通道[串聯至發聲單元]的元件才要換好料, 其餘落地的電感綫圈及大電容就留用˳ 早幾年重造的ProAc D15及D18每聲道只需6元件, 1支電阻, 2個電感綫圈及3支電容, [所以效率有88db, 較SCM40的85db高], 成本既低得多, 又簡單易做得多˳

喜的是ATC發聲單元當然是佳品, 尤其是中音特別重料, 箱體及單芯銅電感綫圈質素尚可以, 但此外其他所有用料都差得多, 有些更雞到無倫, 即是有很大改善餘地[“空間”二字已被梁某糟蹋了] :

1] 箱內填充物是玻璃綿, 不好聲又會引致皮膚痕癢 [如果你開箱的話]˳ 即時取出丟棄, 改用純羊毛會靚聲得多, 4磅共$720˳
2] 兩聲道全部24支綫繞水泥電阻, 有電感又劣化音質˳ 訊號通道共8支改用丹麥Duelund石墨電阻連純銀引綫 [共要用$1,500元], 音質更通透, 細節更易釋放, 贏水泥電阻幾條街˳ 其餘16支改用較平的Mundorf metal oxide氧化金屬膜無電感電阻˳
3] 兩聲道全部12支電容是台湾大路牌子 Bennic, 產地不明[可能台湾或大陸], 離高檔優質甚遠˳ 接高音單元的6.8uF改用德國Mundorf Supreme, 接中音單元用英國ClarityCap ESA 39uF 及台湾UCC 鋁膜1uF並聯成原值40uF[大數值Mundorf Supreme超貴, 還要两支以上並聯凑成40uF], 另外的6.8uF也改用ClarityCap ESA, 10uF就改用UCC˳ ATC SCM 50 及100分音設計與40完全相同, 只是部份電阻數值不同, 前二者各12支電容也只是用ClarityCap PX而已, 比ESA還低兩個級別, 更不必與Mundorf Supreme比了˳ Tannoy 旗艦Royal Kingdom 也是用ClarityCap的[可能是訂製版], Kensington及Sandringham也是用ClarityCap˳
4] 接中音單元的電感改用Mundorf CFC14 銅箔綫圈˳ 少些內阻及集膚效應˳
5] 箱內所有接綫是無名AWG16[橫切面積只有約1.31 sq mm], 給中, 低用音實在太幼, 綫芯內料似乎連OFC也不是˳ 接高音單元改用1mm Mundorf 銀金綫, 聲音更通透又有貴氣[已在D18及仿1sc用過]˳ 接中音單元用台湾製AWG14[30股橫切面積共約2 sq mm] 6N單晶銅綫, 此前已用以造喇叭綫及電源綫自用及給友人, 效果都很滿意˳ 接低音單元改用Furutech古河AWG12 [多股合成橫切面積共約3 sq mm] Alpha-OCC單晶銅, 力量更充沛˳
6] 接綫柱質地也很差, 而箱內柱後有連腳的金屬墊圈以螺絲母收緊在柱身, 用普通非铜質小型綫夾插上該腳 [接觸点很細, 並且夾得不太穩, 可以用手指輕易摇動, 內阻不小], 綫夾後段夾著接綫往分音器, 由分音器出來接綫同樣以綫夾插上单元出來的金屬接駁腳, 又差多一重, 音响系统其他器材及由擴音机接來的喇叭綫不論如何優質[及昂貴], 經過這些低質接綫柱, 綫夾及雞綫等多重關卡 [柱 -> 墊圈腳 -> 綫夾 -> 接綫銲往分音器 , 分音器出銲往接綫 -> 綫夾 ->單元綫圈的引出腳], 音質 [尤其是細微音樂訊息] 必然大打折扣,還未計通道中的低質电阻等, 音質合共折損咗幾多? 你話呢?
新造接綫全部用Mundorf Supreme含9.5%銀的鍚綫點對點銲接˳ 分音器装在外置鋁箱[共4個, 連運費$740], 將元件固定在洞洞板上, 也是點對點銲接, 接綫與音箱內所改用者大致相同, 不用靠PCB上內阻較大的薄銅箔傳導, 外置分音器又可減少受震動影響˳
7] 音箱後的接綫柱就算只用WBT最低對上一級的, 兩聲道Tri-wire共12支也要近$2,500, 還未計Amp至分音器鋁箱又再去喇叭箱那些[即要再加多2份額外24支], 質素再好些的就更不用說, 太太太貴貴貴了, 况且只計以上#1至#6項已用近9千元˳ 分音器鋁箱及音箱外都改用30A瓦底AC電綫接駁座[電工叫”簪玉”的], 不用义或蕉插[又慳一筆], 只用兩頭裸綫在簪玉內相叠[是直接連接, 不是靠簪玉內銅合金管傳導], 螺絲底下插上長條小銅片再收緊螺絲壓實兩頭裸綫, 音箱外簪玉就固定在鋁板, 然後装在音箱後原有接綫柱板位置˳
8] 上手物主已跟高人建議, 拆去箱底木板及承托腳釘木條, 改為只用一塊10mm厚鋁板[與箱底同樣大小], 比原装好聲, 但他沒有給人加工銑窿以裝回箱體及原有腳釘, 只用泥膠[BluTack] 黐住˳ 因量少又非熟客, 五金工場照原木板上的窿位銑兩塊共16個螺絲窿要收我$500˳
9] 因帶重量級磁鉄的中音[单隻共重5.2公斤!]及低音單元[4.5公斤, 反而比中音輕]都在箱體上半部, 兼且装在下截的原有分音器[重約3公斤]已拆除, 上重下輕的情况更嚴重, 於是從淘宝買了共16公斤鉛粒[連運费又用$720], 入厚布袋後分別置於兩邊箱底鋁板上, 以作平衡, 又可減震˳
__________________________________________________________________________

(附註甲) : 有朋友之前已聽過數次我改裝後之D15,細佬那對未改前他又剛到我處,駁回原版給一聽,第二首未播完他已要求速速換回我那對了。

(附註乙) : A Korean HiFi friend in HK [music lover since ¼ century], Mr. K [his amp is AVI integrated, same as mine] gave me his pair of clone ProAc 1sc bookshelf speakers [in use for a few years] after buying the 2nd hand genuine ProAc 1sc [in Elbony veneer, $15k used]. I found the driver units to be ScanSpeak tweeter & 4" Seas and the cabinets were very well made. So, I decided to rebuild the crossover with good quality components. Even the binding posts were replaced by high quality pure copper ones from Taiwan. Artificial fibre acoustic absorbent was replaced with genuine wool fibre. Only the drivers & cabinets were retained. After trying the modded clone in another friend’s setup, we found that the clone matches his ProAc D2 in almost all aspects except that bass is weaker due to the small 4" driver. Then I convinced Mr. K to try the modded clone. If he likes the sound, he has to pay me only the cost of components for the modd $3.8k. He bought the clone several years ago at $2.5k, total cost will then be $6.3k, just 42% that of his used original. But the modded clone sounds better than the genuine version.

Below is the feedback from Mr. K after trying the modded clone [note in bracket is added by me] :

Quote
Over the last week I have been thoroughly auditioning the modded clone ProAc 1sc. Now, AVI [solid state integrated amp] has been pushing the speakers. So far, so good!!! [he does not like the sound from his genuine 1sc driven by AVI] As you know, I have currently three sets of bookshelf speakers, genuine ProAc 1sc [he uses tube amp to drive it for vocals & small scale music], the Korean one [based on B&W design, larger than 1sc, he uses AVI to drive it for classical, symphony, etc.], and the clone 1sc. If I am allowed to own only one set, I will definitely choose the clone 1sc. When the clone matches with the tube amp, it is almost like the original ProAc. And, when it plays with a SS amp, it can handle large-scale music, too [in a room not too large]. The modded clone is surely well crafted speaker. My wife [she is a piano player although not a professional] also prefers the clone over the original. I have to thank you for your efforts.
Unquote

He had been using the modd clone since then and packed the genuine 1sc in box to keep in storeroom.

(附註丙) : B&W N804物主是澳門人, 在浸大任教, 只在週末回澳門家, 他帶了低音部份分音器給我看, 零件質素普通不在話下, 原有綫圈的鉄芯竟然生銹的! 買斉料後約定曰期往澳門動手, 約11時到步開工, 至晚上八時後完成, 他一聽改善之大興奮到即時入房捉他太太出來同試[她因有点不適早已進房休息], 她也聽到改善很大˳


待續


最後修改時間: 2015-03-24 15:35:58
diwily
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203.xxx.xxx.174
2015-03-24 15:28
[#2] ATC SCM40 重生記, 被魔怪狂摩[改]    
好吸引!有無相睇?
bighead
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218.xxx.xxx.146
2015-03-24 17:20
[#3] ATC SCM40 重生記, 被魔怪狂摩[改]    
稍後会嘗試上相的.
diwily
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203.xxx.xxx.174
2015-03-24 17:23
[#4] ATC SCM40 重生記, 被魔怪狂摩[改]    
唔知有冇試聽呢? ^^

i-walker
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202.xxx.xxx.213
2015-03-24 17:33
[#5] ATC SCM40 重生記, 被魔怪狂摩[改]    
師兄,我也是ATC40用家,期待你摩改後的聲音報告及相片.

最後修改時間: 2015-03-24 17:34:11
minidetective
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220.xxx.xxx.16
2015-03-24 17:33
[#6] ATC SCM40 重生記, 被魔怪狂摩[改]    
"ATC SCM 50 及100分音設計與40完全相同"

My SCM100 (s/n <100), all caps changed value terribly.
finally all caps replaced and Sun shine again.

diytfy
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155.xxx.xxx.45
2015-03-24 17:53
[#7] ATC SCM40 重生記, 被魔怪狂摩[改]    
暫時改好一隻,試了出声, 但要放兩箱分音器在喇叭後, 在窄窄空間對好6 pair綫收緊螺絲+分艱巨. 塞好羊毛及装好箱後, 思前想後,决定再折開,準備將高及低分音器装番入喇叭箱,尚未动工, 只会留大个的中音分音器外置.
初試啼声時,喇叭箱側臥地毡上,[鴛鴦對,左D15, 右SCM40] 只高中音入了箱,底未封,低音只光禿禿放地上, 声音好像已比D15豐滿,低音都实些.
diwily
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203.xxx.xxx.174
2015-03-24 18:03
[#8] ATC SCM40 重生記, 被魔怪狂摩[改]    
如果有圖加上各零件數值就好,可以預先買材料唔使咁多日無歌聽。1) ~ 6) 似乎都應該跟。
bighead
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202.xxx.xxx.193
2015-03-24 18:09
[#9] ATC SCM40 重生記, 被魔怪狂摩[改]    
diytfy兄,
如果有能力DIY,就算不換接綫柱及其他,建議起碼換掉那些雞綫及綫夾,用好些的錫綫銲实.
你以前的cap是不是印有"ATC PX" [即ClarityCap]的,可往#10的link看其他SCM100的分音器全相

最後修改時間: 2015-03-24 18:22:39
diwily
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203.xxx.xxx.174
2015-03-24 18:10
[#10] ATC SCM40 重生記, 被魔怪狂摩[改]    
http://www.diyaudio.com/forums/multi-way/122779-original-crossover-schematics-clone-atc-scm-100-a.html
[Link with crossover schematic (#121 P. 13) for SCM100 (similar to SCM40) & photo (#111 P. 12 & #123 P.13) of actual unit] , value of some resistors for SCM100 & 40 are different.

Pls PM me if you want to know the value of resistors for SCM40.





最後修改時間: 2015-03-24 18:35:11
diwily
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203.xxx.xxx.174
2015-03-24 18:15
[#11] ATC SCM40 重生記, 被魔怪狂摩[改]    
條Link好正! 那些 SCM40 Bennic 是否 E-Cap? 是的話,一定換Film Cap啦!
bighead
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202.xxx.xxx.193
2015-03-24 18:31
[#12] ATC SCM40 重生記, 被魔怪狂摩[改]    
Bennic 也未差至E-cap, 都是film cap 的.
diwily
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203.xxx.xxx.174
2015-03-24 18:36
[#13] ATC SCM40 重生記, 被魔怪狂摩[改]    
I am Proac D18 user, can you please also share your exp in modifying D15 and D18.

What a good post. b
dttmtong
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14.xxx.xxx.253
2015-03-24 19:25
[#14] ATC SCM40 重生記, 被魔怪狂摩[改]    
"你以前的cap是不是印有"ATC PX" [即ClarityCap]的"

diwily 兄, 無印ATC PX, 是黑色S字頭旳stock貨

diytfy
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124.xxx.xxx.32
2015-03-24 21:08
[#15] ATC SCM40 重生記, 被魔怪狂摩[改]    
玻璃棉改為羊毛,Q值點計算?
mallkee
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112.xxx.xxx.56
2015-03-24 23:28
[#16] ATC SCM40 重生記, 被魔怪狂摩[改]    
hi diytfy

back to hk next month , any gathering , pm you , lost you phone no?
vtm211
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86.xxx.xxx.112
2015-03-25 02:20
[#17] ATC SCM40 重生記, 被魔怪狂摩[改]    
dttmtong兄,
Pls PM me your email address. Will send you my previous posts on modding D15/18 & other info for the modd.
Tks

最後修改時間: 2015-03-25 09:48:43
diwily
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203.xxx.xxx.174
2015-03-25 09:48
[#18] ATC SCM40 重生記, 被魔怪狂摩[改]    
diwily,

pm sent.

Thanks!
dttmtong
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14.xxx.xxx.253
2015-03-25 10:41
[#19] ATC SCM40 重生記, 被魔怪狂摩[改]    
vtm211 hing,

You're always wellcome.
Parties is easy , just give me a call when you're in town.

check PM
diytfy
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155.xxx.xxx.45
2015-03-25 14:39
[#20] ATC SCM40 重生記, 被魔怪狂摩[改]    
Trying to reach http://www.imagestation.com. Got message "Server not found". "imageuploading" is shut down. I don't use yahoo email account since several years ago after being hacked. So, I can't reach "flickr" Pls advise how I can upload photos by other means. Tks & rgds.
diwily
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203.xxx.xxx.174
2015-03-25 17:27
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