Feedback when sub cable is touched... - Blu-ray Forum

Hammie · 01-04-2010, 02:05 PM

Alright... Last night right before bed, I dropped something behind my SVS sub. When I reached back to pick it up, I touched the sub RCA cable and thought the sub was about to blow up. It was the loudest feedback I have ever heard. The sub cable is a 35' Monoprice Premium RCA cable rated to in-wall. I also have a 6' sub cable going from my Denon Sub Out to the wall. There is no feedback when I touch that one.

Any thoughts on my issue? Is this bad for my sub?

kingofgrills · 01-04-2010, 09:25 PM

My first instinct is that your touching the cable created a grounding issue that generated feedback.

Perhaps your sub cable's shielding isn't sufficient? I've never encountered that sort of feedback when handling my sub cables before.

Big Daddy · 01-05-2010, 12:42 AM

Quote:

Originally Posted by louhamilton

Alright... Last night right before bed, I dropped something behind my SVS sub. When I reached back to pick it up, I touched the sub RCA cable and thought the sub was about to blow up. It was the loudest feedback I have ever heard. The sub cable is a 35' Monoprice Premium RCA cable rated to in-wall. I also have a 6' sub cable going from my Denon Sub Out to the wall. There is no feedback when I touch that one.

Any thoughts on my issue? Is this bad for my sub?

About 10 years ago, I used to connect the built-in 15" subwoofers in my front Definitive Technology speakers with premium 15 ft RCA cables. I had exactly the same problem. Everytime I touched them, I could hear explosions in the my room. Although it happened a few times over the years as I was tweaking my system, there was no damage to the speakers/subwoofers. A couple of years ago, I finally replaced the cables with RG6 subwoofer cables and the problem went away. I can move the cables and there is no noise.

Unfortunately, I heard a buzz from my front speakers a few weeks ago. I haven't been able to isolate the noise. I believe there is a rat in my HT room and I need to buy a gun.

Hammie · 01-05-2010, 03:57 AM

Quote:

Originally Posted by Big Daddy

About 10 years ago, I used to connect the built-in 15" subwoofers in my front Definitive Technology speakers with premium 15 ft RCA cables. I had exactly the same problem. Everytime I touched them, I could hear explosions in the my room. Although it happened a few times over the years as I was tweaking my system, there was no damage to the speakers/subwoofers. A couple of years ago, I finally replaced the cables with RG6 subwoofer cables and the problem went away. I can move the cables and there is no noise.

Unfortunately, I heard a buzz from my front speakers a few weeks ago. I haven't been able to isolate the noise. I believe there is a rat in my HT room and I need to buy a gun.

I may need to invest in a new cable (although I just bought it about two months ago from Monoprice). It is their top of the line RG6 RCA cable. Maybe I need to look into Blue Jeans.

crazyBLUE · 01-05-2010, 04:00 AM

Quote:

Originally Posted by Big Daddy

About 10 years ago, I used to connect the built-in 15" subwoofers in my front Definitive Technology speakers with premium 15 ft RCA cables. I had exactly the same problem. Everytime I touched them, I could hear explosions in the my room. Although it happened a few times over the years as I was tweaking my system, there was no damage to the speakers/subwoofers. A couple of years ago, I finally replaced the cables with RG6 subwoofer cables and the problem went away. I can move the cables and there is no noise.

Unfortunately, I heard a buzz from my front speakers a few weeks ago. I haven't been able to isolate the noise. I believe there is a rat in my HT room and I need to buy a gun.

Big Daddy ~ Big Gun ~ Watch out rat

Big Daddy · 01-05-2010, 04:06 AM

Quote:

Originally Posted by crazyBLUE

Big Daddy ~ Big Gun ~ Watch out rat

I know I should not have watched the Ratatouille movie.

This is the fate of all rats in my HT room.

Hammie · 01-05-2010, 04:07 AM

I just tested something. I removed the Radio Shack Y-splitter and the feedback went away when I touched the sub cable. I either need to use one input on my sub or get a better quality Y-Adapter.

Big Daddy · 01-05-2010, 04:11 AM

Quote:

Originally Posted by louhamilton

I just tested something. I removed the Radio Shack Y-splitter and the feedback went away when I touched the sub cable. I either need to use one input on my sub or get a better quality Y-Adapter.

Good to hear you found the cause of the feedback.

Check post #2 of A Guide to Bass Management for links to high-end Y adapters.

Hammie · 01-05-2010, 04:23 AM

Quote:

Originally Posted by Big Daddy

Good to hear you found the cause of the feedback.

Check post #2 of A Guide to Bass Management for links to high-end Y adapters.

Thanks!

jlafrenz · 02-05-2010, 05:14 AM

One thing to keep in mind is that your body does contain electricity. When you touch a cable, you are sending an electrical signal to the sub. I have touched sub cables and made them hum, but never a loud explosion as a couple of you have mentioned. Very interesting.

curse · 02-05-2010, 05:45 AM

Quote:

Originally Posted by jlafrenz

One thing to keep in mind is that your body does contain electricity. When you touch a cable, you are sending an electrical signal to the sub. I have touched sub cables and made them hum, but never a loud explosion as a couple of you have mentioned. Very interesting.

dont invite this guy over then

01-04-2010, 02:05 PM	#1
Hammie Blu-ray Champion Top ranked HT gallery Top contributor Member since:May 2008 Location:Washington, DC Metro Home Theater Gallery:53 Blu-ray collection:545 DVD collection:12 Trading Score:12	Feedback when sub cable is touched... Alright... Last night right before bed, I dropped something behind my SVS sub. When I reached back to pick it up, I touched the sub RCA cable and thought the sub was about to blow up. It was the loudest feedback I have ever heard. The sub cable is a 35' Monoprice Premium RCA cable rated to in-wall. I also have a 6' sub cable going from my Denon Sub Out to the wall. There is no feedback when I touch that one. Any thoughts on my issue? Is this bad for my sub?

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01-04-2010, 09:25 PM	#2
kingofgrills Blu-ray Guru Top ranked HT gallery Member since:Dec 2007 Location:PDX Home Theater Gallery:31 4K collection:5 Blu-ray collection:81 Trading Score:31	My first instinct is that your touching the cable created a grounding issue that generated feedback. Perhaps your sub cable's shielding isn't sufficient? I've never encountered that sort of feedback when handling my sub cables before.

01-05-2010, 04:07 AM	#7
Hammie Blu-ray Champion Top ranked HT gallery Top contributor Member since:May 2008 Location:Washington, DC Metro Home Theater Gallery:53 Blu-ray collection:545 DVD collection:12 Trading Score:12	I just tested something. I removed the Radio Shack Y-splitter and the feedback went away when I touched the sub cable. I either need to use one input on my sub or get a better quality Y-Adapter.

02-05-2010, 05:14 AM	#10
jlafrenz Special Member Top ranked HT gallery Member since:Feb 2010 Location:Columbia, MO Home Theater Gallery:48 Trading Score:4	One thing to keep in mind is that your body does contain electricity. When you touch a cable, you are sending an electrical signal to the sub. I have touched sub cables and made them hum, but never a loud explosion as a couple of you have mentioned. Very interesting.

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