成套機的死穴

JackieEason

玩 CAS 咁耐，最後發現成套機喞死穴竟然係 NAS 喞 LPS 入面 AC inlet 到火牛一段線。小弟部 NAS 係一條網線直插 Streamer 喞，冇經 router。如果係經 router死穴就係 router 用喞 LPS 入面。

點解咁講，因爲呢個位置相當敏感，條線啲聲會比 DAC 或 Streamer 都要敏感好多。連續試咗幾日，每一條線的缺點會好明顯。

Nordost Blue Heaven：線條極度幼細，冇低頻，直程好似谿線咁。同一條線用於 CDP 就啱啱好。
Cardas 機内線：低頻糊，人聲口形太大。
JPS in wall：高低頻比例OK，但係好慢，人聲慢到好似梦游咁。
Transparent PowerLink Premium：低頻多咗，隆隆聲，比Cardas仲沉，不過人聲口形大細OK。分離度極之好，就係冇高頻。
Western Electric 24AWG單芯線三條夹：低頻薄，中頻高頻都好靚。分離度唔够，人聲高一个key，蔡琴後生10岁。聲場深，但唔够寛。
Jessen 0.6mm 純銀線三條夹：低頻啱好，比cardas同transparent薄小小，不過就太實。高頻飈得好紧要。同樣條線用嚮 DAC就啱啱好。
Neo Black Memba：低頻比Cardas薄，比Jessen 松。聲場靠後好多，深度大。男聲會小小昂昂聲。速度比Cardas快，同Transparent差唔多。

以上啲缺點全部都加大碼，太過明顯。試到小弟都冇意見，跟住都唔知要換邊隻好，頭都赤。

xerxeshowie

diamondblack

無話死唔死穴，只係隨著系統不停改善，系統嘅瓶頸位也在變而已。今日瓶頸係條AC cable，搵到條好嘅就變咗NAS裡面隻SSD，換完後日瓶頸就移位到條Ethernet cable，無止境。

東東LO

師兄的耳仔真是＂絕對耳＂

jeff703

Thanks

天下第一刀

建議用串聯兼並聯甲類穩壓電源供電來減輕牛及電源線對聽感的影響﹐特別系SPDIF輸出的供電電源﹐在>=44.1Khz高頻信號下電源對各個頻段的的響應時間及內阻都不同。

我剛做左一個﹐12V輸入5.1V輸出的串聯兼並聯甲類穩壓電源﹐輸出先並0.1UF及假負載電阻(5.1V/0.1A=51 Ohm)﹐用330uF正接電源輸出﹐負接耳機插座+﹐插座負接地﹐插入32歐監聽耳機。在取樣輸入用100UF無極電容輸入﹐用10K音量電位器﹐接上CD音頻信號﹐調整各管的偏放置到最好聲﹐最後按原設計完成安裝﹔用在EM-U1010 Sound card上﹐換各種電源線影響很少﹐在12V的輸入電源上並聯18W的LED燈後﹐僅在3秒鐘內被LED燈PWM恆流電源影響變KEY﹐3秒後立即正常。聲音非常中性﹐基本上接近以前錄音機用電池時的聽感。
http://www.hiendy.com/hififorum/ ... id=84731&extra=

PS.用LM317+TL431聲音非常軟﹐但沒有力度。對于電源﹐基本上什么材料出什么聲﹐
當晶體管工作在類似膽的放大特性曲線時聽感最佳。

JackieEason

diamondblack 發表於 2015-5-4 06:17
無話死唔死穴，只係隨著系統不停改善，系統嘅瓶頸位也在變而已。今日瓶頸係條AC cable，搵到條好嘅就變咗NA ...

NAS 的 LPS 太過敏感，所以一定要最開始 Set 好機就校聲。小弟對 LPS  或者講係 NAS 太輕視，全部 IC，PC，platform，隔離牛，地盒等等 ，連LPS  recap都做埋，先至諗起搞 AC Cable，結果改小小都好明顯，點郁都會過，變成一線定生死。如果係一開始先搞咗 LPS，後面仲有一百幾拾種方法去補翻。

稍後再試 Synergistic Research，唔得就真係冇計。

charleslinnfans

One suggestion - plug Shunyata Alpha Digital PC into your LPS. Alpha digital can kill digital noise and let your hear original sound !

diamondblack

charleslinnfans 發表於 2015-5-5 00:02
One suggestion - plug Shunyata Alpha Digital PC into your LPS. Alpha digital can kill digital noise  ...

No.JackieEason was referring to the section between the power inlet and the transformer INSIDE the LPS.

Again this is an everlasting game. After all, it's down to personal taste. May you share also what's the original one and what do you like to improve from that?

charleslinnfans

diamondblack 發表於 2015-5-5 07:10
No.JackieEason was referring to the section between the power inlet and the transformer INSIDE the ...

That still applies because Alpha digital can help to make good electricity supply to AC inlet firstly.

diamondblack

charleslinnfans 發表於 2015-5-5 07:13
That still applies because Alpha digital can help to make good electricity supply to AC inlet firs ...

Well that will introduce new questions as the overall tonal balance and noise profile will be changed.

Your suggestion may resolve his problem at hand but I would guess JackieEason is already using a good power cord to power his NAS' power supply.

charleslinnfans

diamondblack 發表於 2015-5-5 07:17
Well that will introduce new questions as the overall tonal balance and noise profile will be chan ...

I am using it with KLPS directly plug into wallet and am very satisfactory.

Kam328

我推薦玩CAS的朋友可以試下Shunyata Research 的DPC-6 數碼產品專用電源處理器.  佢有6個位, 專門針對數碼産品電源會受到及產生之干擾. 由如一度防火牆 好有效, 值得一試!

http://www.shunyata.com/our-prod ... -dpc-6v2#!dpc6_back

CAS2012

There is always a weakest link in CAS for you to find out. Yesterday, I compared a LAN cable between Netgear router and Linksys switch hub, a 20 feet with a 3 feet cat 5e LAN cable, took me 15 minutes to identify 20 feet is a better choice to isolate high frequency noise from router. Another story was said before,  I compared the performance of NAS with HDD attached to router, this time, the differences are tiny, I listen to a song and compare both without delay in memory, daphile can choose the same song from NAS or from HDD, finally I choose HDD attached to router which gives better analog sound.

charliey

大膽建議，我現用digital audio player cayin N6 3.5mm 經rca 直出amp，效果吾錯……

karsonkwan

可惜我的NAS係內置火牛。。。要用LPS 好煩

diamondblack

karsonkwan 發表於 2015-5-13 06:28
可惜我的NAS係內置火牛。。。要用LPS 好煩

呢個係我選擇4-bay NAS其中一個最重要嘅考量。

karsonkwan

diamondblack 發表於 2015-5-13 07:03
呢個係我選擇4-bay NAS其中一個最重要嘅考量。

Qnap好似都係內牛

diamondblack

karsonkwan 發表於 2015-5-13 07:04
Qnap好似都係內牛

QNAP而家開始有中檔嘅4-Bay用外置牛。

雖然用外置牛唔代表係無switching，但都好過入機已經係switching。

karsonkwan

diamondblack 發表於 2015-5-13 07:13
QNAP而家開始有中檔嘅4-Bay用外置牛。

雖然用外置牛唔代表係無switching，但都好過入機已經係switching ...

我都係4 bay