Ethernet Isolator (dual channel)

Eliminates the electrical and common-mode noise in the Ethernet by galvanically isolating the music streamer from the noisy network. Works without power supplies and can be placed between the music streamer and the switch, and/or between the WiFi router and the switch, bringing the CAS sound quality to the next level.

Traditional isolation utilizes a pair of electrical-optical converters which convert electrical signals to optical signals and then back to electrical signals. These conversions aim to isolate the electrical noise and common-mode noise (CM noise) existing in the Ethernet connections. However, this solution is complicated, expensive (better to have LPS) and occupies space, the effect is not significant. Indeed, this solution can isolate the majority of noise from the rest of the Ethernet but during the last stage of optical-electrical conversion, it introduces noises to the streamer again, and it is also susceptible to CM noise as well.

This Ethernet Isolator refers to the working principle of balanced isolation transformers, it galvanically isolates the streamer from other equipment in the network. It does not only eliminate the CM noise, but also creates an isolated and clean Ethernet for the streamer to work on, and therefore delivers better sound quality.

Each Ethernet Isolator possesses 2 individual channels, which can be used concurrently (between the WiFi router and the switch, and between the switch and the streamer), or connected in series (only applicable between the switch and the streamer). Connecting the channels in series yields a better isolation effect.

The most obvious effect after using the Ethernet Isolator is darker (quieter) background, reduced harshness and better bass response. On the other hand, the sound become more musical and analogue, and listener will feel less fatigue.

*The isolation transformers inside the chip need to take around 10 days to break in

Dimensions (mm): 79(L)x70(W)x24(H)
Data Rate: 1000Mbps x1, 100Mbps x1

YouTube demo (starting from 7:50)

Price: HKD380 (1USD=7.8HKD)
Can ship worldwide, shipping fee incurs.



NOTE:
Some devices may not support 100Mbps (e.g. Lumin U1 mini), in that case you have to use the 1000Mbps channel.

FAQ
1. IEEE 802.3 already specifies the isolation requirement is 1500Vrms at 50Hz to 60Hz for 60s, why is there a need for further isolation?

a. The standard only specifies how many volts that the ports / connections can withstand, the purpose of voltage isolation is solely a safety consideration which protects people from electrical shocks, but it does not specify how much noise should be isolated.

b. The below table shows CMRR and crosstalk of a commonly used chip in switches, there is still a room for isolation improvement. Adding an Ethernet Isolator can significantly improve the rejection ratio.

c. EMI / RIF noises are not necessarily generated / picked up at the switch, they can be picked up by the long Ethernet cables which act as antennas. Longer and looped Ethernet cables are more susceptible to noise pick up. Isolating the noise at the last mile (just before the streamer) is more effective.

2. Why are there two channels in the Ethernet Isolator?

a. Surprisingly a slower Ethernet connection sounds slightly better than a faster connection (this is also generally true for other audio equipment), with two channels you can choose which channel to go with. Alternatively, you can place the 100Mbps isolation between the switch and the streamer, and concurrently place the 1000Mbps isolation between the WiFi router and the switch to improve the overall Ethernet noise level.

3. What Ethernet cables are recommended?

a. Cat 8 shielded cables (STP) are recommended. Don’t worry about the ground loop problem as one side of the ports are made with insulated plastic RJ45 ports. However, for the connection to the streamer, a very short STP cable (e.g. 0.5m) is recommended.

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where can i buy and get delivery to europe?

Please PM me with your city so that I’ll provide a quote including shipping fee to you.
Thanks.