A challenge to the "measurement" camp

glupson,

Something tells me the answer to your question may be revealed in @andy2 's inability to answer my question about feedback.

Glupson, all the gryphon owners I know of match them with high quality, ie fairly expensive, cables.
im sure there might be some who don’t, I’ve just not met them. I suspect that the higher the equipment cost, the more likely you are to also find more expensive cables. 

@andy2 - did you manage to see the video about speaker cables absorbing RFI ?? Pretty good information.

To be clear, the speaker wires can convert radio waves into electrical energy = noise.

The meter on the tuner is a measurement device!

https://www.youtube.com/watch?v=DC0s6KqQz3g

Wire changing radio waves into electrical energy sounds like an antenna to me. Didn't they have any insulation on the wire? 

rixthetrick,

This is a relatively well known potential noise source, but a lot of it has to do with the bandwidth of the feedback network, not to mention it takes a fair amount of RF to inject anything audible, and it needs to be AM modulated in some fashion.

---- IF YOU HAVE SILENCE ON YOUR SPEAKERS WITHOUT A SIGNAL, THERE IS NO RF INJECTION VIA THE SPEAKER CABLES ---- ... that should be pretty obvious, but alas, it seems not to be. Put your head up against the speakers ... anything that seems RF related? .. No? .... it will be 10's of db quieter at your listening position.


All those no global feedback amplifiers? ... they are fairly immune to RF injection on the speaker wires.

Next you have to look at the RF source and modulation scheme. Remember cell phones not too long ago where you could hear them in your computer speakers? That was time division multiplexing, essentially bursts of radio with burst rates in the audio bandwidth. Your modern cell phone, WIFI, Bluetooth, FM and TV do not use that modulation scheme.  Those cell phone signals did not inject via the connection to the speaker, they connected through high impedance analog nodes at inputs to amplifiers.

Of course, this is all assuming things like no EMI filtering capability in amplifiers, and that is going to come down to the experience of the designer, but my experience is mass-market stuff in that regard is actually better, not worse, especially if it incorporates digital as they need to ensure nothing gets out, not just nothing gets in.

The video shows that weaving conductors (tight twisting) will reduce effectiveness as an antenna. That is nothing new. However, it **claims** but provides no proof at all of anything audible, which would actually be excruciatingly easy ....

REPEATING AGAIN --- IF YOU HAVE SILENCE ON YOUR SPEAKERS WITHOUT A SIGNAL, THERE IS NO RF INJECTION VIA THE SPEAKER CABLES ----  that should be pretty obvious, but alas, it seems not to be. Put your head up against the speakers ... anything that seems RF related? .. No? .... it will be 10's of db quieter at your listening position.


Keep in mind the owner of GR Research is not an engineer.