Hiend Cat 7 cable choice?

willip

Seems there has not been any new player in the market. I remember some c hing mentioned a Japan made (not Sanwa) before, but forgot the name.

Any c hing can tell?

willip

Found it AIM

CKKeung

http://www.aim-ele.co.jp/avd/products/shieldio_na3.html  

ThomasLi@FB

玩 CAS 時， 數據傳輸速度不高，用 Cat 7 線有無好處呢？

其實 LAN 線同數碼線一樣，要有靚嘅插頭、導體和屏障 (shielding) 才有好表現。

diamondblack

ThomasLi@FB 發表於 2015-1-19 09:25
玩 CAS 時， 數據傳輸速度不高，用 Cat 7 線有無好處呢？

其實 LAN 線同數碼線一樣，要有靚嘅插頭、導體和 ...

CAT7嘅好處主要係行業規格定明對cable crosstalk同控制噪音比CAT6同CAT5e有更嚴嘅規格，CAT7線普遍shielding會做得好。如果你拆開條CAT7線，通常裡面4組線會有獨立shielding。

速度嘅話，CAT5e已經係Gb。

插頭主要係mechanical shielding嘅分别。「只係」百零二百幾一個，小的個人覺得幾抵玩，但係CAT7線比CAT6同CAT5e難夾。

t1174

Aim na3 其實是不是cat7 來真是唔知，記憶中線上冇 mark. 但出來效果音色正常而且好好就真，現在日元低入手比 aq 抵。

sealteam4

同玩HDMI一樣，理得佢咩格式，只要是不玩4K影像，雲吞河 條舊款的HDMI線最有性價比
Lan都一樣，做得好就一定要理佢cat 6 cat7
不過又咁睇，我覺得唔值買貴Lan線

JackieEason

其實網線唔單祗係傳數碼，仲會将 NAS 的 DC 電的波紋傳過離，直接影响 streamer 的音色。

墙插的 50Hz/60Hz 交流電經過火牛與整流爲 DC 直流電，不過部機入面的直流電唔係一條直線，會有好多低頻波紋，其中100 Hz 至 3000 Hz的會直接加落音頻訊號影响音色。呢啲波纹來源有三，一係電力公司線路上面的谐波，二係喇叭出来的音頻振動傳入條 PC 度形成 feed-back，三係火牛自身磁力。呢啲波紋雖然極之細微，不過相當頑强，就算隔離牛同 filter 都無法完全隔絕。經過 DAC，Pre-amp，Power amp，層層放大好多倍後，足以影响音色。所以 fuse 或 pc，作用於 pre-amp 大於 power amp，作用於 dac 大於 pre-amp，而 streamer 或 CDT 就最爲敏感，皆因毎一層都放大咗波紋。

講返網線。金属介貭頻寛有限，越純凈就頻寛越大。音頻訊號頻率祗有20-20KHz，不過網線傳递數碼訊號非常高，係百MHz計算（1M=1000K）。一般雜牌網線，金属雜貭多，過高頻無問题，低頻就過唔到。試下用條雜牌网線做 IC 就會發現冇低頻。同理，用嚮 streamer 同 NAS 之間的網線要靚聲，一定要低頻靚。小弟之前試過至少10幾款網線，IT牌子中，Avaya係最靚低頻，不過唔通透。都係用返 Audio grade 會好啲。平喞有 QED，貴小小就試一下 Furutech LAN-10G，小弟自己有用紧。

diamondblack

JackieEason 發表於 2015-1-19 14:49
其實網線唔單祗係傳數碼，仲會将 NAS 的 DC 電的波紋傳過離，直接影响 streamer 的音色。

墙插的 50Hz/60H ...

睇唔明 “過高頻無問题，低頻就過唔到。試下用條雜牌网線做 IC 就會發現冇低頻”，可唔可以elaborate一下？

victorwk1628

Hi diamondblack hing,
Do you have try inakustik reference cat 7 cable

tleonard

Oehlbach is the central brand for high-quality audio and video cables in Germany. And with good reason. For nearly 40 years, the company based in Pulheim near Cologne has not only stood for outstanding product quality, but also genuine innovation. Oehlbach designs and manufactures high-quality cables that transmit all audible and visually perceptible details from high-quality audio and video components. It is very important to us to offer practical and technologically meaningful solutions as a company that serve just one purpose: To provide high-quality electronic components with equally high-quality cable connections and to achieve optimum sound and picture. And that at a perfect price-performance ratio. The trade press and specialists continuously confirm to us the superior quality of Oehlbach cables. In countless international tests, Oehlbach cables have been evaluated and well-rated by experts.

德國有隻單晶銅 CAT6 叫做 Oehlbach XXL Hyper Stream ，1.7 米賣緊 75 歐羅。

http://www.oehlbach.com/en/computer/network/xxl%C2%AE-hyper-stream
http://www.amazon.de/Oehlbach-Stream-High-End-Netzwerk--Streamingkabel-schwarz/dp/B005DX0WQG
http://www.futureshop.co.uk/oehlbach-xxl-hyper-stream-ethernet-cable-with-ethernet-17m-p-8258.html

•Inner conductor material: HPOCC® - Monocristalline Copper

•Shielding material: 2 x aluminium foil + 1 x copper braid

•Cable sheathing: Fabric sheath

•Plug design: Full-metal screw-type plug

---

日本仲有一條好似好勁嘅線，唔知有無師兄試過呢？

http://aug-line.com/products/interface-lanse
http://www.amazon.co.jp/AUG-LINE-Solid-LAN-SP-ソリッドオーグライン-インターフェイスLAN-Special/dp/B00OLE5A06

英國又有另一條俾人唱到乜咁：

http://joshinweb.jp/audio/17124/4535540200949.html

---

最想試嘅其實係 AQ Diamond 大戰 USB 轉 SFP 光纖嘅效果，理論上行光纖係無咁多 noise：

http://winyao.taobao.com/category-976483259.htm

diamondblack

victorwk1628 發表於 2015-1-19 16:47
Hi diamondblack hing,
Do you have try inakustik reference cat 7 cable

No. I have my NAS about 4m away from the streamer in a small room so I got the main Ethernet cable between the computer source and the streamer running in-wall.

天下第一刀

請用同軸跟任何高級的CAT7接同一個ＤＡＣ比較下聽感.

JackieEason

diamondblack 發表於 2015-1-19 15:38
睇唔明 “過高頻無問题，低頻就過唔到。試下用條雜牌网線做 IC 就會發現冇低頻”，可唔可以elaborate一下 ...

網線，network cable的穏定傳輸能力要求有100公尺，線心用高純度的OFC。而一般我們所說之“網線”，其實是 Jumper，接駁 device 到 jack 之間，長度3到5呎爲多，不會太長。所以好多平價網缐，不會用太好的線材。此纇不够純的銅，對於高頻訊號的短距離傳送無問題。不過頻寛甚窄，不足以满足20Hz - 600M Hz（cat.7）。所以10KHz以下衰减明顯。若然我們用此類網線當作音頻訊號線接駁source到amp，听感就會低音極瘦，高音極硬。此亦是好多ching發覺I2S不如conxial的原因（當然，小弟亦都試過一部雜牌 router 跟機線，完全不按spec做的，線芯極之垃圾，低音一舊舊，此另當别論。）IT機房用的專業網線牌子，AVAYA制作就完全守規矩，線芯的OFC銅貭很純，頻寛足够，所以用於NAS 至 streamer 上，听感會比較正常，不會干瘦，但未到好听，因爲非爲 audio 而設計。Furutech LAN-10G就不一樣，以 Furutech 在 audio 領域之經驗，會符合對听感會的要求。亦得益於PCOCC線芯，數碼傳送可達10Gbps，其實都不會有人要用條cat.7來傳到10G高速。亦都相信，用audio grade的網線接駁 I2S 應該不會比 conxial 难听好多的情况。

dandylinpsst

英國的chord cable好像也有做

nhk

Ching, have you try Oyaide Neo Cat 7 is 707 cable, not expensive with good comment. My friend use as Denon link has very good result
http://www.neo-w.com/english/is-707e.html

naimsg

For users of streamers, you can try the following and see if it makes any difference:

1. Use a optical media convertor to isolate the streamer (like the Linn Klimax DS) from the rest of the network.
2. Use a high quality LPS on the optical media convertor that is connected to the streamer side.
3. Instead of using shielded ethernet cable on the network (the side that is not connected directly to the streamer), use an unshielded cat5e cables.
4. Use a high quality shielded cat 6 or 7 ethernet cable to connect the media convertor to the streamer.
5. Drain the shield of the shielded cat 6 or 7 ethernet cable to the media convertor side

If possible please share your result.

waikeywi

naimsg 發表於 2015-1-20 22:23
For users of streamers, you can try the following and see if it makes any difference:

1. Use a opti ...

C Hing,

Why the use of unshielded cable elsewhere?
And what do you mean by drain the shield of the shielded CAT 7 cable?

tleonard

http://www.hiendy.com/hififorum/forum.php?mod=viewthread&tid=80153

Wiredream 嘅 LAN 線：

http://www.wiredream.co.kr/shop/item.php?it_id=1343389771
http://www.wiredream.co.kr/shop/item.php?it_id=1379893740
http://www.wiredream.co.kr/shop/item.php?it_id=1381072214
http://www.wiredream.co.kr/shop/item.php?it_id=1385468107
http://www.wiredream.co.kr/shop/item.php?it_id=1386545134

naimsg

waikeywi 發表於 2015-1-20 22:40
C Hing,

Why the use of unshielded cable elsewhere?

Sorry for the late reply. I do not fully know the theory behind it, but this is want I did:

1. Connect the optical convertor to the Klimax DS using a Shieldio NA3.
2. This cable will have an arrow direction. Point the arrow of the cable from the optical convertor to the streamer. 3. If you use a multimeter, you will find that the metal shield of the two metal ethernet plugs are not connected. The electrical resistance is infinity.
4. The cable will have a metal plug at both side.
5. Take a piece of aluminium foil from the kitchen. Fold it into a long strip of about 1.5cm in width and 15 cm in length.
6. At the optical convertor side, wrap the aluminum foil round the metal ethernet plug. Then use a clothes pug and hold it in place.
7. Next strip a electrical power cable off by about 1.5cm, connect the bared earthed wire to the other end of the aluminium foil. Use a pug and hold it tightly in place.
8. Connect the other end of the power cable to the Earth pin of the power plug. Must connect to the right one! Remember to check and double check!
9. Then plug in the "power cable" to the power distributor. In my case, I am connecting it to a Shunyata Triton/Typhon combo. I know that the Earth portion of the Triton is filtered but I am not sure if that will make any difference.
10. You might want to clean all the surfaces with concentrated alcohol before connecting them.

Play music through the streamer. See if you like the difference. I discovered this after some extensive experimentation. If you find a dramatic improvement to the sound quality and if you like this tweak then put a "+1" to this post. Hope this helps.

Btw, try this at your own risk.