SOtM sNH-10G Switch - 小弟2018所有聽過的 audiophile switch 中的皇者!

vhs

ThomasLi@FB 發表於 2018-12-20 18:16
非常同意，玩音響是睇餸食飯，量力而為，器材鬥貴是無意思的。

我的體會是很多師兄經常捉錯用神，播 fil ...

Nevertheless, the best option is to omit any network switch/wireless router between the computer and DAC/Rendener/Streamer. Instead, use direct ethernet connection.

tw113

CKKeung 發表於 2018-12-19 13:44
SOtM sNH-10G Switch 自己只是一件過，但需要用家自備外置 12V powersupply，當然要用線電啦！
捨唔捨得 ...

師兄你好，請問你用邊款外置12V powersupply供電比SOtM sNH-10G Switch呢？謝謝！

CKKeung

tw113 發表於 2018-12-21 00:35
師兄你好，請問你用邊款外置12V powersupply供電比SOtM sNH-10G Switch呢？謝謝！

Uptone LPS1.2

ThomasLi@FB

vhs 發表於 2018-12-20 23:17
Nevertheless, the best option is to omit any network switch/wireless router between the computer a ...

Yes and no.

One of the main problems in computer-based music player is high frequency noise generated from CPU and power supply. We can reduce the noise from power supply but can't do anything with CPU. There is no CPU specially designed for CAS system.

Audio grade network switch, like SOtM, goes to great length in isolating this noise. It is basically a big network filter. I doubt omitting switch in the signal path is the best way forward.

dekiller

While most player program utilities RAM PLAY mode ,  audio network switch is just non-productive.

spang123

ThomasLi@FB 發表於 2018-12-19 11:11
好多人話：識人好過識字。這句話在 HiFi圈也是定律，有高人指點就唔會盲目跟風，亂咁買嘢走錯路。

樓主是 ...

非常同意Thomas兄的意見，要達致靚聲的其中一個非常重要的關鍵是盡可能降低jitter，真是可以起到決定性的作用，因為這會影響最終音質的自然度、細緻度等。

我亦極之贊同數碼音響（包括CAS）可以做到非常靚的音質。正如Thomas兄說，數碼音響可以做到非常Analog，媲美黑膠的程度。

另外，不知Thomas兄說的SFP光纖收發器是否那些將SFP光纖訊號與一般LAN線訊號互相轉換的module？那些是FMC（Fibre Media Converter）。其實，SOtM這部Audiophile Switch於某程度上可以當成一部Audiophile grade FMC加上Switch功能的設備。一般的FMC的音質效果不理想，多數也是因為jitter較大的原故。如果設備許可，把FMC改為用NIC（Network Interface Card），尤其是一些low latency的NIC，可以改善音質，可能有意想不到的效果。

vhs

CKKeung 發表於 2018-12-21 05:41
Uptone LPS1.2

spang123

ThomasLi@FB 發表於 2018-12-21 08:39
Yes and no.

One of the main problems in computer-based music player is high frequency noise gener ...

One of more cost effective solution to tackle this problem of electrical noise (galvanic) isolation as well as prevention of induced jitter is to use direct connection (network bridging) with fibre optics network and with NICs (not FMC) at both ends, if your equipment set up allows.

vhs

spang123 發表於 2018-12-21 10:50
非常同意Thomas兄的意見，要達致靚聲的其中一個非常重要的關鍵是盡可能降低jitter，真是可以起到決定性的 ...

"........一般的FMC的音質效果不理想，多數也是因為jitter較大的原故。如果設備許可，把FMC改為用NIC（Network Interface Card），尤其是一些low latency的NIC，可以改善音質，可能有意想不到的效果。"

dekiller

Switch的工作是由一個IP將data packet送去指定IP。工作与file transfer一樣。沒有jitter這個東西。所聽到的聲音影響還是noise与EMI而已。

darkfrank

vhs 發表於 2018-12-20 23:17
Nevertheless, the best option is to omit any network switch/wireless router between the computer a ...

自從由offline local playback轉玩roon後發覺network對聲音劣化好明顯，係影響local file playback，所以就諗下有咩方法可以降低影響。

試過加Cisco switch + uptone lps-1.2，聲音不如cas direct connect去一部gaming pc 上的 intel pro pt network card dual port 行 network bridging通透.

對比方法係cas唔插LAN線，最原始冇干擾既聲音，a/b 咁去聽 direct connect & 加 Cisco switch.
結果direct connect 既聲音取向係更接近唔插線，加了Cisco後會加了switch既性格，覺得聲音稍偏中高頻、緊。

所以我最後加了一張JCAT Femto Network card行direct connection而唔用switch。

spang123

darkfrank 發表於 2018-12-21 11:23
自從由offline local playback轉玩roon後發覺network對聲音劣化好明顯，係影響local file playback，所以 ...

很同意darkfrank兄的分享，direct network connection using network bridging 是玩音樂串流的一個改善音質的好方法。運用JCAT Net Card Femto 是一個很好的選擇，尤其是設備未能配合於兩端使用fibre NICs的情況。

vhs

dekiller 發表於 2018-12-21 11:16
Switch的工作是由一個IP將data packet送去指定IP。工作与file transfer一樣。沒有jitter這個東西。所聽到的 ...

However, if there is a signal transformation/conversion such as copper-based Ethernet to optical fiber, network latency is incurred. Network latency is the time a packet takes to travel from a endpoint to another. The latency is not constant as packets are routed individually and transmitted in a queue.  The inconsistency of such is considered as jitter.

vhs

darkfrank 發表於 2018-12-21 11:23
自從由offline local playback轉玩roon後發覺network對聲音劣化好明顯，係影響local file playback，所以 ...

I have a similar experience using direct Ethernet connection between Roon core computer and dCS Network Bridge.

vhs

spang123 發表於 2018-12-21 12:01
很同意darkfrank兄的分享，direct network connection using network bridging 是玩音樂串流的一個改善音 ...

Exactly  

CKL

I use WiFi to remove all ethernet EMI.

dekiller

vhs 發表於 2018-12-21 12:03
However, if there is a signal transformation/conversion such as copper-based Ethernet to optical f ...

At that moment,  what you said is totally irrelevant to jitter. You may call them delay. Streaming starts from your player program not the NAS.

dekiller

CKL 發表於 2018-12-21 12:19
I use WiFi to remove all ethernet EMI.

EMI exists in air. Switch off your mobile and you will hear the difference.

vhs

dekiller 發表於 2018-12-21 12:33
At that moment,  what you said is totally irrelevant to jitter. You may call them delay. Streaming ...

Partially true.

Sometimes, the terms of Network Latency and Delay can be interchangeably adopted. Network Latency is the term to indicate a delay of data communication over the network. But, more often, Network Latency is known as round-trip time of the packet.  

spang123

CKL 發表於 2018-12-21 12:19
I use WiFi to remove all ethernet EMI.

WiFi是透過電磁波傳送，正正就是一種EMI（電磁波干擾）的來源。那又怎能除去EMI呢？