You are not logged in. [Log In]


Forums » General Discussion » Home Theater » Confused about Axioms Newsletter Article on Hummmm

Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#368567 - 03/03/12 05:09 AM Confused about Axioms Newsletter Article on Hummmm
Funcshun Offline
frequent flier

Registered: 07/16/07
Posts: 14
Loc: Atlanta,Ga
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???

Top
#368570 - 03/03/12 07:47 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Funcshun]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 11437
Loc: Central NH
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.
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

Top
#368576 - 03/03/12 08:01 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Funcshun]
justinwacker Offline
hobbyist

Registered: 02/25/12
Posts: 20
Loc: Madison, WI
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.
_________________________
Pan TH-50PZ800U
Onkyo TX-SR805
Axiom M80 (2)
Axiom VP180
Axiom QS8 (2)
Axiom EP500
PS3, Harmony One

Top
#368578 - 03/03/12 08:28 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: justinwacker]
Funcshun Offline
frequent flier

Registered: 07/16/07
Posts: 14
Loc: Atlanta,Ga
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?

Top
#368579 - 03/03/12 08:41 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Funcshun]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 18044
Loc: NoVA
That ground isolator does not connect to the subwoofer, it connects to the cable TV cable.
_________________________
I am the Doctor, and THIS... is my SPOON!

Top
#368584 - 03/03/12 09:25 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Funcshun]
Jc Offline

aficionado

Registered: 06/27/06
Posts: 523
Loc: Sherbrooke, QC, Canada

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

Top
#368585 - 03/03/12 09:40 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Funcshun]
alan Offline

connoisseur

Registered: 01/29/02
Posts: 3256
Loc: Toronto/New York/parry Sound
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)

Top
#368586 - 03/03/12 10:00 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Funcshun]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 18044
Loc: NoVA
Alan, I believe he has Canare brand RCA connectors. See the BlueJeans subwoofer cable page: http://bluejeanscable.com/store/subwoofer/index.htm
_________________________
I am the Doctor, and THIS... is my SPOON!

Top
#368587 - 03/03/12 10:18 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Funcshun]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13565
Loc: Iowa
Yep Ken, that is what I use for my subwoofer cables.
_________________________
M80s-VP180-4xM22ow-4xM3ic-EP600-2xEP350
Anthem AVM60 Outlaw 7700 Emotiva A500 Epson 5040UB



Top
#368588 - 03/03/12 10:39 AM Re: Confused about Axioms Newsletter Article on Hummmm [Re: Ken.C]
alan Offline

connoisseur

Registered: 01/29/02
Posts: 3256
Loc: Toronto/New York/parry Sound
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)

Top
Page 1 of 2 1 2 >

Moderator:  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 
Forum Stats

15,206 Registered Members
15 Forums
23,962 Topics
423,590 Posts

Most users ever online:
883 @ 03/04/17 05:06 PM

Top Posters
Ken.C 18044
pmbuko 16437
SirQuack 13565
CV 11675
MarkSJohnson 11437
0 registered ()
197 Guests and
3 Spiders online.
Key: Admin, Global Mod, Mod
Newsletter Signup