HORRIBLE ground Loop problem with EP4000/Cap 2400 - Page 2 - AVS Forum
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post #31 of 39 Old 04-16-2013, 03:08 PM
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Quote:
Originally Posted by ratm View Post

just the sub.

Well that's good. So with an iPod connected to the sub amp, does it create a hum or not?

I assume you have an mini to rca cable and that the iPod can even drive an EP4000 (LOL).


Also, if your AVR has pre-outs, you could connect the EP4000 to the Left or Right pre-outs, and see if that hums too or if it is just the sub-out port.

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post #32 of 39 Old 04-16-2013, 04:45 PM
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http://www.jensentransformers.com/

this is what bfm is talking about when he says use a transformer.

the device uses two windings of coil to pass the signal electro-magnetically from one device to another without actually making a physical contact, thus breaking the ground loop and eliminating the hum.

http://www.jensentransformers.com/datashts/sub1rr.pdf

http://www.jensentransformers.com/sub1rr.html

everything you ever want (or don't) to know about ground loops:

http://www.jensen-transformers.com/an/generic%20seminar.pdf

i'm not sure if there are less expensive options once you isolate the particular connection that is causing the problem.

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post #33 of 39 Old 04-18-2013, 06:36 AM - Thread Starter
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OK, so I narrowed down at least 75% of the hum to my DirecTv box. As soon as I unplugged that HDMI connection, I lost at least 75% of the hum. It is still there, but I have to get to within about a foot of the Cap to hear it. My next step is to buy one of these. A. Can I buy that from a typical electronics store? B. Someone on here posted that it doesnt work with DirecTV? C. If B isnt accurate and it does work with DirecTV, does it matter where I connect it in the line? It comes into my house and then is split to all the other rooms.

I am also going to buy another surge protector strip with a Coax ground connection like Mark S suggested.
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post #34 of 39 Old 04-18-2013, 07:34 AM
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do you get the same reduction when you disconnect the coax from the Direct TV box? how about when you unplug the power from the Direct TV box? I was getting a hum from my projector and used one of those Hum-X adapters. worked great.

i dont think that filter will work because its the wrong bandwidth. i would try this one instead: http://www.soontai.com/2G-isolator.htm

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post #35 of 39 Old 04-18-2013, 07:45 AM - Thread Starter
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Quote:
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do you get the same reduction when you disconnect the coax from the Direct TV box? how about when you unplug the power from the Direct TV box? I was getting a hum from my projector and used one of those Hum-X adapters. worked great.

i dont think that filter will work because its the wrong bandwidth. i would try this one instead: http://www.soontai.com/2G-isolator.htm

So far all that I have done was Unplug the HDMI cable from the back of my AVR. I'll try unplugging and disconnecting the coax when I get home.
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post #36 of 39 Old 04-19-2013, 09:37 AM - Thread Starter
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Quote:
Originally Posted by brian6751 View Post

do you get the same reduction when you disconnect the coax from the Direct TV box? how about when you unplug the power from the Direct TV box? I was getting a hum from my projector and used one of those Hum-X adapters. worked great.

i dont think that filter will work because its the wrong bandwidth. i would try this one instead: http://www.soontai.com/2G-isolator.htm

what bandwith should i be looking for?
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post #37 of 39 Old 04-19-2013, 10:06 AM
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i beleive Direct TV is 5 -2.3 GHz

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post #38 of 39 Old 04-19-2013, 11:02 AM - Thread Starter
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post #39 of 39 Old 04-19-2013, 11:09 AM
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Quote:
Originally Posted by ratm View Post

http://www.mcmelectronics.com/product/DISTRIBUTED-BY-MCM-4170-/33-8700 this one is 5 - 2.4, would that work?

i would give it a shot. im actually going to order one as well. i have not tried one but from what i have read, that is the bandwidth needed for it to work. the other ones will knock out your signal. there is actually a comment on that page about using it successfully with Direct TV (DTV)

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