Well extra wirings on a transformer or indeed extra transformers won't do any good at all. Just stand there doing nothing and never will so a waste of money at best.
Storage is Gigabit speed, audio end points seem to be 10/100. I should have a look at my Source:Five, it may be gigabit as it has a built in switch as well as five end points.
Last edited by dpstjp; 2014-09-0901:21. Reason: Source:Five
Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.
Re GB or DS version: Yes, ID40 & 41 cards require only 100Mb, so only need two or the four balanced pairs, per recco on Acousense website. I liked Crion's advice re future-proofing for upcoming M products, or different future application. �80 difference isn't life changing for most of us. 1000Base-T is in use now in professional circles & I wouldn't be surprised if some version of that were to find its way down to the great unwashed in the next 18 months or so.
Re the point about potential for the GB version to inject additional noise onto the two unused balanced pairs, two reasons why this can't happen. First, the GISO is a passive device, using transformer coupling, so the only way you could end up with noise (that wasn't there already) on the two un-used pairs would be if the GISO was able to generate noise internally on the primary windings of those pairs. No voltage, no current, no signal on primary, so no induced signal on secondary winding. Second, the transformer windings are designed to present near-zero coupling for the higher frequencies where the noise sits. This, of course, is why the GISO is so effective at reducing noise in the two in-use pairs in the first place. So if there's any environmental noise whatsoever on the two unused balanced pairs (technically possible due to RF ingress), then the best way to get rid of it is to use a GISO which isolates all four balanced pairs. Of course, we're splitting hairs here, as it's likely that the signal lines of the unused pairs are open-circuit inside the ID4x, but just to allay any concerns, there is no possibility of the GB adding noise versus the DS.
Re other makes of audio-oriented LAN isolators, specs or not, we just won't know how they compare until others get hands-on with them. In fact, we'd really need someone to try both in one system ... and no, I'm not volunteering at this stage
I decided to go with the Emsafe purely on price! I think it is around halve the price of Giso GB
"Audio dedicated" often, but not always, means higher margins
In the FAQ they also state that these devices are also used in audio applications. On your last point, I agree, but reading all the positives here I thought I would give the Emsafe a try for 150�.
Hi Shaun,
Sorry, I should have spotted this earlier. I think you might not get a good result the EMsafe isolator, as it looks like it's designed purely with safety and equipment protection in mind.
The principle of galvanic isolation is about breaking physical electrical connections, while still allowing the signal to pass through using transformer induction. In a safety and equipment protection scenario, the benefit is that the signal gets through un-scathed, but the receiving equipment is isolated from voltage surges and spikes.
Having shared a few emails with Ralf at Acousense, I now understand that his isolator does some clever things with the transformers, effectively tuning the windings to allow the wanted signal frequencies through transparently, while rejecting the un-wanted high frequency noise.
Yes, the earth gets isolated and effectively re-based in the receiving device via Galvanic isolation, but this is a minor part of the overall story in the audio application. The big gain comes from filtering out the very damaging high frequency noise and I'm guessing this isn't being done in the EMsafe.
I could be completely wrong, but I can see no reference to selective filtering of unwanted frequencies on the EMO Systems site.
You'll get a little bit of benefit from isolating the earth, as the balanced pair signals on the Ethernet cable are all reference earth and there will certainly be noise there. But noise is also induced on the positive and negative-going signal lines of each balanced pair and I'd guess the EMsafe won't address that.
If you get a big improvement in sound, then great, as we'll have found a cheaper alternative to the GISO. If not, I hope you might be able to get a refund.
A network isolator is an electrically insulating separation device for Ethernet-based networks. It disconnects all the electrically conductive connections between the connected network peripherals and the connected device, and typically provides protection against DC and AC voltages of 4 kV and greater. At the same time, it makes possible an almost loss-free transmission of high frequency AC signals with frequencies greater than 1 MHz, which are used in the Ethernet protocol for signal transmission.
What do you exactly mean by high frequency noise? What is it's source/root cause?
Of course the proof of the pudding is in the eating. Also, as you quite rightly state, a true side to side comparison with the Giso would be the only definitive way to go.
Shaun
861v8 & ID41, HD621, DSP7200SE Upgrade Fronts, DSP7200HCSE Upgrade, DSP3200's rears, B&W ASW850 (sub), QNAP 871 for Sooloos, Cineultra V203, Dune HD, Apple tv 4k, Lumagen Radiance Pro, Sim2 C3X. LG Oled C9
I didn't mean this to come across as negative or as a bit of a dig. Just trying to help with a little electrical knowledge.
By high frequency noise, I mean noise that is always present on our power grid (very significant). It works its way onto all our components and signal cables, whether analogue or digital. Airborne RFI (radio frequency interference) is also a big factor and much more prevalent these days from 3G and 4G mobile signals and Wi-Fi. Again, this airborne RFI works its way into our kit. Switch mode power supplies (found on all computers, routers, Ethernet switches etc) also generate nasty switching noise. Lastly, as Ronnie mentioned elsewhere, now that our systems are connected to our LAN and PC network, there is also noise from the digital signals going to and fro on the PC and internet (i.e. non-audio) side of the network. Whatever, the source, all this stuff works its way into our systems and, to varying extents, can impact sound quality negatively.
Originally Posted by In the FAQ
... makes possible an almost loss-free transmission of high frequency AC signals with frequencies greater than 1 MHz, which are used in the Ethernet protocol for signal transmission' merely refers to the fact that the EMsafe allows the full signal spectrum through. It may well be that EMO systems do apply targeted filtering either side of the wanted signal frequency range, but there is no explicit reference to this.
I did get a reply from them this afternoon (it seems there might have been a delay at my end with Outlook playing up), which said if you place an order by email they will send you an invoice and your order will be shipped upon receipt of payment (by bank transfer or Paypal).
Current pricing is confirmed as:
GISO DS 249,- EUR GISO GB is 349, - EUR incl. VAT and shipping.
As mentioned previously, there is a three week money-back return option, if returned in perfect condition, which seems fair.
I didn't interpret anything as a dig or negativity...just want to understand better that's all
Therefore what your saying is that the Giso is more that just a LAN isolator for galavnic seperation, it has other filters designed in according to Ralf at Acousence? Is that correct?
Shaun
861v8 & ID41, HD621, DSP7200SE Upgrade Fronts, DSP7200HCSE Upgrade, DSP3200's rears, B&W ASW850 (sub), QNAP 871 for Sooloos, Cineultra V203, Dune HD, Apple tv 4k, Lumagen Radiance Pro, Sim2 C3X. LG Oled C9
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