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Confused about Axioms Newsletter Article on Hummmm
#368567 03/03/12 10:09 AM
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I just read the article and it refers to a coaxial cable between the SW and AV from what I understand. In my system and the ones I have built there never has been, it's just one cable with a canare connector. I have noticed a hum from my SW but only when playing Blu-rays on the PS3. The hum will go away if I turn the receiver to (Pure Audio) that's what Onkyo calls it anyway. From what I understand it turns off unnecessary "things" in the receiver. It's weird though I don't hear it through the Tivo or Apple TV only the PS3....Any ideas???

Re: Confused about Axioms Newsletter Article on Hummmm
Funcshun #368570 03/03/12 12:47 PM
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Chances are good that the hum is a ground loop. You can test this by using a "cheater plug" that bypasses the ground pin on the plug.

Chances are pretty good that it's being caused by your cable input to the system, further evidenced by the "Pure Audio" mode on your Onkyo bypassing the video circuitry.


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Re: Confused about Axioms Newsletter Article on Hummmm
Funcshun #368576 03/03/12 01:01 PM
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The cable you're using is, in fact, a coaxial cable. It's just of fancier sort. It refers to what's in the cable, not really what it does. RCA cables of any kind also qualify as coaxial, as do most interconnects.

As for the hum, these other fellows will have a better chance than I of clearing that up for you.


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Re: Confused about Axioms Newsletter Article on Hummmm
justinwacker #368578 03/03/12 01:28 PM
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The Ground Isolator that is referred to looks like it has threads on it meaning it was for use with coaxial cable. Is there one without threads that you are aware of?

Re: Confused about Axioms Newsletter Article on Hummmm
Funcshun #368579 03/03/12 01:41 PM
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That ground isolator does not connect to the subwoofer, it connects to the cable TV cable.


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Re: Confused about Axioms Newsletter Article on Hummmm
Funcshun #368584 03/03/12 02:25 PM
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The easiest way to install the Axiom ground loop isolator is to install it beetwen the cable service wall plate outlet and the cable box.

It works to solve the issue when your tv/internet service provider is delivered via ground tansportation;it will not work with a satellite provider.

If your PS3 is connected to the internet it might the origin of your ground loop problem. To verify if it is the case simply remove the internet connection from your PS3. If the hum goes away you have identified the source of your hum problem.


jc
Re: Confused about Axioms Newsletter Article on Hummmm
Funcshun #368585 03/03/12 02:40 PM
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Hello funcshun,

Just an FYI: in domestic audio/video systems, canare connectors are mostly used for RF connections. I've never heard of a subwoofer-to-AV receiver connection using canare connectors. It doesn't mean you can't use one (you obviously have); it's just that all AV receivers and subwoofers normally use the RCA-style connector with shielded cable between the line-level sub output and the subwoofer line input.

In balanced systems, XLR cables are used between the preamp or AV receiver and the subwoofer.

All other comments about ground loops and eliminating the latter apply.

Regards,
Alan


Alan Lofft,
Axiom Resident Expert (Retired)
Re: Confused about Axioms Newsletter Article on Hummmm
Funcshun #368586 03/03/12 03:00 PM
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Alan, I believe he has Canare brand RCA connectors. See the BlueJeans subwoofer cable page: http://bluejeanscable.com/store/subwoofer/index.htm


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Re: Confused about Axioms Newsletter Article on Hummmm
Funcshun #368587 03/03/12 03:18 PM
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Yep Ken, that is what I use for my subwoofer cables.


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Re: Confused about Axioms Newsletter Article on Hummmm
Ken.C #368588 03/03/12 03:39 PM
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How bizarre. I just Googled "canare connectors" and various links popped up, like this one, to the usual RF-type connector:

http://www.fullcompass.com/search.php?tx...CFYMRNAodeDfU-Q

So "Canare" is a brand name of RCA-style connectors?

Rather confusing.

Cheers,
Alan


Alan Lofft,
Axiom Resident Expert (Retired)
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