+1 for audioquest cinnamon

Enjoy the NDX Mike - it's a great piece of kit and should give you a lot of pleasure 

Thanks guys , isn't anything easy anymore?? 

Ingen problemer Lars

TDK ZCAT2035-0930A

Size is 8mm but will fit up to 9mm & 8/9mm is shown in some data sheets

Supra cable is 7.5mm – the clamp fits well but it can move slightly on the cable

I do find it hard to work with, its not exacly flexible is it ???

But once my new furniture arrives to house the NAS & router, it will be fixed & no more a concern. 

The rest of the relevant spec –

Frequency Range:50MHz to 500MHz

Impedance @ 100MHz: 80ohm

Ferrite Grade:30

External Diameter:19.5mm

External Length:35mm

BigH it is all very easy when you know what you doing 

Seriously, ignore the detail if you want, just sometimes it helps to understand a little bit when the tweak doesn't have the desired effect. After all we are only dealing with physics here and not voodoo. 

Mike i would say the choke I suggested from Maplin may be more effective than the one you list, at least for the sort of RFI I am impeding around  30 to 100MHz. 

Remember the 100BaseT encoding frequency is around 31 MHz and with Ethernet around that is one I like to focus on.

Simon

Not so sure about that Simon

The Maplin ferrites are listed as HEM30

I cannot find a data sheet anywhere for them, but I strongly suspect the "30" number is the ferrite material

My TDK ZCAT2035-0930A are also 30

Maplin have rated theirs at 25-100MHz

TDK data sheets show the curves & the intended use range numbers over various ranges 10-100MHz, 50-100MHz  & 100-500MHz

Making comparisons is further compounded as the impedance is dependent on the ferrite mass, e.g. a same sized outer case for a smaller cable size will be higher than one for a larger cable. 

Hi Mike according to Maplin's website:

HEM3010 attenuation 25Mhz 85 ohms; 100 MHz 146 ohms

HEM3018 attenuation 25 MHz 120 ohms; 100MHz 190 ohms

HEM3019 attenuation 25MHz 93 ohms; 100 MHz 158 ohms

BTW not sure about your last point - other than that if there is air delectric spacing between the ferrite and the surface carrying the AC current then the impedance would be affected yes.

Buy one of each And fit them. Would it hurt???

Perhaps, if you were to let their weight put a strain on the connection? I use a small piece of foam between the ferrite choke and shelf below (very near my network player's port), and I also support the ethernet cable from a wall hook using a rubber band.

ATB.

Hook

I was thinking in terms of SQ rather than from a mechanical point of view.

No it wouldn't hurt at all, just perhaps not necessary.

I took the plunge and ordered a 15' Cinnamon.  I'm hoping I can stop using the usb input and go back to streaming...

Lars, the wired 100Mbps Ethernet (100BaseT) has an encoding frequency of around 31MHz. Therefore this may couple from Ethernet leads.

PS we are not dealing with nice single sine waves here so there will be a series of harmonics and intermodulation frequencies as well.

Most chokes will be effective, it's just that some will be more so than others 

Lars, it's probably a divisive point. Too much official detail might put some off as it might be perceived as 'complicated', and I suspect Naim would prefer the dealer network to advise and setup unless the end customer was already confident with the principles involved, thereby hopefully better securing end customer satisfaction.

Simon

Thanks Simon for the pointers! I got my RF choke from element14 (formerly farnell) today.

The diameter is 6mm and it clips securely to my Cat6 cable. Comes with a little tool for removal too.

If there are any differences in sound, certainly it is not day or night. Will need more time to compare but for the price (~3 pounds excluding shipping), it is worth a try.

I tried a 12 meter run of Audioquest Cinnamon to make a wired connection and heard a subtle difference compared to the wireless connection (W4S modified Sonos).   The sound became more revealing, which I liked on better quality recordings.  Unfortunately, the high frequencies were just a little too pronounced on some recordings.   That’s not to say the AQ Cinnamon is bright but in my system, it revealed more detail that I wanted to hear when streaming 320K files from Spotify.   I returned the AQ Cinnamon and reverted back to a wireless connection.   My current ethernet cable is cheap and flimsy, so I’m replacing it with two AQ Forest ethernet patch cords (.75 meter) to connect the Airport Extreme and Sonos Router.   I don’t expect to hear a difference in a wireless conection but the better quality cables should provide a little peace of mind. 

Lars, most good dealers have learned that they must also be specialists in home networking.  My local dealer has folks on the staff that have the specialty, as the high end whole-home systems they are mostly installing these days all depend on an in-home network and internet access.  Here in the States, it seems that multi-room / whole-home solutions are driving much more business than stand-alone 2-channel hi fi.  People want to watch their movies in more than one room, and hear their music in more than one room.  Dealers who cannot or will not support networked music and/or video will be left in the dust so to speak, I believe.

And to add to this, I think that some of the 'finer points' we discuss here are "tweaks" that are not necessary to enjoy networked music.  I feel that Simon is 1000% correct; making this seem overly-complicated would turn off many more customers than it would satisfy.

The Sonos model of 'just plug this stuff in and it will sound good' is a very good model for business.  "Try each of these 17 rf chokes in any of 12 positions on various cables in your network" would not be a good model for business

Not disagreeing,  especially the last point,  Bart,  but I believe Naim could do a whole lot better with some basic diagrams such as published by Linn & Cyrus for example - given they do not mention ferrites.  

But looking at a wider world of systems that use ethernet cables,  e.g. Ricoh & Cisco, they supply very simple drawings in their install instructions that includes ferrite clamps & how & were they should be installed.