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RCA Capping? :

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2017 at 11:56pm
PS. Although we have not submitted our products for EMC testing in the UK, our S Korean importer had to do it to comply with new laws over there. All passed!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Drewan77 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2017 at 11:54pm
I'm trying to rationalise what I and a few others on this thread believe we hear, which seems to be at odds with the actual science. I have no qualifications or knowledge in this area but I always try to apply my own form of 'logic'... quite possibly wide of the mark I accept. 

It was mentioned somewhere earlier in this thread that leaving or extending the centre pin on an RCA phono plug would act as an aerial & that makes sense to me. So, maybe because the various ported sockets on our equipment are by nature connected directly to the electronics, they act as a form of aerial in their own right and blocking the hole immediately in front does have some sort of effect. 

I compare this with the squeezebox 'mesh' circuit in my house (5 devices) & there are places where walls etc block the signal but a small adjustment resolves it, likewise with the router and a booster or phones and computers or twisting a digital/FM aerial slightly to receive a signal. Aren't some of these using the HF signals that we are talking about?

Is it therefore possible that the casework has some blocking effect like this whereas an open socket immediately adjacent to the circuitry has less... or none?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2017 at 11:53pm
I don't know what equipment this is being tried with but assume it's not any of mine, and if such an improvement has been gained then the manufacturer would be in serious trouble if the product was submitted for EMC testing. In other words it must have been highly susceptible to GHz interference!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ernie Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2017 at 11:20pm
You aren't sending signals between the nails in your floor boards and they aren't active components (apart from actively holding your floor boards in place) so the EMC directive doesn't apply. Basically boxes that commicate with each other need to be on the same ground plane.

Electromagnetic wave travel at roughly the speed of light 3 x10^8 m/s so you have to be right up in the GHz to get a wave length small enough to affect your gear entering the RCA sockets. There a vents in most casework that'll be more of a problem.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Drewan77 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2017 at 11:13pm
Absolutely Jon, I modified/soldered up up the RCA caps today in addition to those XLRs so every unused socket is now plugged (outer ground only, no 'aerials')

Crikey.... music that I know intimately has definitely changed for the better & the natural cynic in me is trying hard to prove a placebo effect. I've been listening intently for several hours & so far I can't!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2017 at 11:04pm
Originally posted by Fatmangolf Fatmangolf wrote:

What happened here whilst I was away? We're now listening in a Faraday cage I understand. Presumably I have to ground each nail in my floorboards or will the metal carpet be enough?

Lets be realistic and accept there will be a way for some EMI to get into our hifi cases, even if that's down the cables we plug in. Surely we can agree that capping off unused sockets is a little better than not doing so, can't we?


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Bruce
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2017 at 10:57pm
What happened here whilst I was away? We're now listening in a Faraday cage I understand. Presumably I have to ground each nail in my floorboards or will the metal carpet be enough?

Lets be realistic and accept there will be a way for some EMI to get into our hifi cases, even if that's down the cables we plug in. Surely we can agree that capping off unused sockets is a little better than not doing so, can't we?

Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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