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About Fourlegs

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    WAVE High Fidelity
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    Melton Mowbray
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    I am in the Hi-Fi trade

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  1. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    You might also have the added benefit of a nice turkey or roast beef smell. Yummy.
  2. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    I have had an instance where I have used cable outside (admittedly not speaker cable) and after a few years the insulation lost it’s waterproof character and started to absorb moisture. I suspect it might have been degrading due to uv.
  3. Fourlegs

    Harbeth 40.1/40.2 vs Spendor SP100/R2

    And yet ATC will service any of their old speaker models and bring them up to current spec. Mine are there at the moment to have the current tweeters fitted and for the crossovers to be calibrated to the new tweeters. So it might be inconvenient but it does generate brand loyalty and it is not impossible to do.
  4. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    Ah, thanks for clarifying. In the case of your dect phone, the effect on your sound quality may already be done whether or not you put the phone on or near the HiFi because after all, the base station is radiating RF throughout the house. Edit to say we are not talking about interference in the sense of buzzing, clicks etc but of a slight hardening of the SQ. A before/after or with/without comparison makes it easier to recognise.
  5. Fourlegs

    DAC Off Part 2: Qutest vs RME ADI-2 DAC

    Sorry, been delayed due to a new year lurgy. More will follow but the RME has just sat on the floor for the moment.
  6. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    Haha, phone oneupmanship on the wam.
  7. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    uzzy, As I mentioned in one of my posts, ferrites are normally not recommended on analogue cables because they will almost certainly interfere with the analogue signal. Digital cables are a different matter. The common mode RFI noise can produce intermodulation distortion in the analogue stage of the Dac which is audible even if the RFI is miles higher than normal audible frequencies. This is maybe even why people used to refer to digital glare as that is exactly how it sounds. A further example of RF being audible is if you have ever left a mobile phone near your HiFi you will know that RF can affect HiFi.
  8. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    and that is why trying random ones off ebay is unlikely to be successful. Look around for sources of RFI. And if for instance you have dect phones or a wireless router then check their operating frequencies. Mostly these will be in the High Frequency range of ferrites.
  9. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    There is no technical spec on those as far as I can see apart from them being ‘black’. At the very least you would want to know if you are buying Low Frequency, High Frequency or Broadband ferrites but within those categories there are many different specifications and better manufacturers will state the impedance at a number of different frequencies for each particular ferrite. This web site has better information on the ones that they sell -
  10. Fourlegs

    Using Ferrite Cores to Reduce RFI & EMF

    The cables which I make and sell use ferrites so I suppose I have some experience. I will try to pass this on, not to sell cables but just to hopefully be helpful to those who might like to experiment with DIY ferrites. The comment about there being many different types and specs of ferrites is correct and it is best to have some understanding about the frequency of the noise that you wish to reduce and to select the appropriate ferrites to tackle that. There are many cheap ferrites on Amazon and eBay but often they do not specify frequency so it is better is to buy from companies such as Farnell who will state the specifications of the ferrites. Manufacturers to look out for are Wurth, Fair-Rite etc. I use solid core ferrites which I select to be tight fitting on the cables to increase their effect but retrofitted ferrites will be the clip on type with split core ferrites. It is generally thought that ferrites are not a good idea on analogue cables because they will usually degrade the analogue signal and should therefore be used with caution on interconnects. In some circumstances a small number or a single ferrite of the correct spec might be beneficial but mostly you will cause more harm than good on interconnects and speaker cables. However I have seen ferrites used with good effect on speaker cables where there is a specific known problem from very low frequency noise from a nearby radio transmitter but these would not be the generic sort of ferrites bought on Amazon or eBay. People do use ferrites on power cables. In this case they can filter out noise coming in from the mains (noise which may be there because of other devices in the house or it might be from noisy neighbours such as factories or offices). Ferrites can also be used to filter noise from a device with a smps to stop it getting back into the ring main. Some people report using 30 or even 40 ferrites on mains cables. I have not personally tried ferrites on mains cables, not because I have a view on whether they might work but just because I have not had the time. Also of course, the sceptical view would be that power supplies in equipment will normally act as sufficient filter. Putting ferrites on the spaghetti junction referred to is unlikely to help cross contamination. As I mentioned it is not recommended to put ferrites on analogue cables and putting them on mains cables is unlikely to stop the emi (ie mains buzz) and an earthed screened mains cable might be a better bet. So where might they be used? I use them in digital cables to filter RF noise which might have got in the cable from the digital device or its power supply or more likely from all the RF emitting devices we have around. Typical culprits are routers and dect phones but mobile phones and other things are also sources. The digital cable simply acts as an aerial and soaks up this noise. This noise is likely to be in the 2 to 4Ghz range and ferrites selected to act in that range would be best for that use. Note that often it is not sufficient to rely on shielding in this instance because the noise can get in the ground plane and cause just as many problems as if it was in the signal conductor. But that is why ferrites are so useful in this instance because they act on common mode noise. On digital cables it is more or less impossible to cause harm to the signal by using too many ferrites. Be prepared though to try up to 30 clip ferrites on a cable. I mostly use around 20 frequency targeted solid core ferrites. When listening to see if you get an affect generally you are looking to get a less harsh sound. If things sound smoother and less tizzy then that is good.
  11. You might possibly be a little disappointed many times then with other DACs. You have no idea about other DACs and their performance in this area and instead are naively happy to take a manufacturers say so on a DAC which you sell as being conclusive evidence of the performance of that DAC (RME). Your presentation of your assumption as fact is misleading.
  12. Why don’t you start one? It will be cr4pped on by the naysayers and I will be accused of trying to sell cables but if you want an informative thread then why not have a go.
  13. Fourlegs

    Valve amp questions...

    Valve amps are relatively simple inside and I would expect that there would be someone local to you who could look at it for you without it being expensive. The cost of a repair could be anywhere from hardly anything to quite a lot if a mains transformer has blown. But now is probably the time to find someone to look at it. Try searching on google for "valve amplifier repairs" local to you. Often these will be guitar amp guys who can also work on hifi amps. An hour of their time to diagnose it should not be too much.
  14. The difference between you and me is that I have bought my Chord kit for my own listening pleasure and so if I think it sounds better then that is all that matters to me. I have no need, requirement or indeed interest in convincing you. On the other hand you are a dealer who is making claims on behalf of kit that you are selling and you therefore have to tread a different path.
  15. I suspect only because you have a certain point of view that is contrary to some of the views expressed in the thread.