Tobias Posted April 22, 2016 Author Share Posted April 22, 2016 (edited) With the RCA sub input cable unhooked ? Cable unhooked, LFE knob in any position = no noise Cable hooked, noise again. Edited April 22, 2016 by Tobias Quote Link to comment Share on other sites More sharing options...
Tobias Posted April 22, 2016 Author Share Posted April 22, 2016 Unplug the receiver and the RCA subwoofer input cable. Any hum at all ? No noise! Quote Link to comment Share on other sites More sharing options...
jason str Posted April 22, 2016 Share Posted April 22, 2016 You mentioned you had a hum before with the RCA unhooked correct ? If so was the sub plugged into a different power outlet ? Quote Link to comment Share on other sites More sharing options...
Tobias Posted April 22, 2016 Author Share Posted April 22, 2016 You mentioned you had a hum before with the RCA unhooked correct ? If so was the sub plugged into a different power outlet ? Both subs on the same power outlet, I just tried with a longer cable in another outlet, and the same hum noise. Quote Link to comment Share on other sites More sharing options...
jason str Posted April 22, 2016 Share Posted April 22, 2016 Unplug your transformer/receiver. Noise still there with the subs plugged into the other outlet ? Quote Link to comment Share on other sites More sharing options...
babadono Posted April 22, 2016 Share Posted April 22, 2016 Posted 22 April 2016 - 02:35 PM babadono, on 22 Apr 2016 - 2:27 PM, said: got any dummys? I don't know what is that. It is an RCA plug with the center contact shorted to the shield(or through a low resistance). If you plug this into the input and the sub still hums the sub is bad. Quote Link to comment Share on other sites More sharing options...
Tobias Posted April 22, 2016 Author Share Posted April 22, 2016 Unplug your transformer/receiver. Noise still there with the subs plugged into the other outlet ? Less, but yes, still the hum... My 5.3.HUM ajjajaj Quote Link to comment Share on other sites More sharing options...
jason str Posted April 22, 2016 Share Posted April 22, 2016 (edited) Something is either wrong with the electrical system in your home (ground) or something hooked up in the electrical system is causing the hum. There should be no noise with the sub RCA unplugged. I doubt you could run both subs and your audio system through one outlet but you could try it, you may throw the breaker if you draw too much current. Sounds like you may still have an easy to fix ground loop issue through the stereo system though. If you like you can leave your subwoofers hooked up like they are and go through the entire house and unplug things one by one and see when the noise subsides. Whatever you would like to do next is fine. Edited April 22, 2016 by jason str Quote Link to comment Share on other sites More sharing options...
jason str Posted April 24, 2016 Share Posted April 24, 2016 Any updates ? 1 Quote Link to comment Share on other sites More sharing options...
Tobias Posted April 24, 2016 Author Share Posted April 24, 2016 Any updates ? Hi! I put some music and wait til the hum come, then, I disconnect EVERYTHING except the sub = NOISE. Then disconnect the RCA = no noise... maybe the Y splitter? I think no, because I made some test with a different cable, a Monster 1000, without the splitter and the noise was there. Thanks jason! Quote Link to comment Share on other sites More sharing options...
jason str Posted April 24, 2016 Share Posted April 24, 2016 You need to install a good ground loop isolator on your subwoofer RCA cable now and should be good to go. Quote Link to comment Share on other sites More sharing options...
Tobias Posted April 24, 2016 Author Share Posted April 24, 2016 You need to install a good ground loop isolator on your subwoofer RCA cable now and should be good to go. Maybe you can recomend me one or two brands? I usually buy in Amazon. Thanks again Quote Link to comment Share on other sites More sharing options...
jason str Posted April 24, 2016 Share Posted April 24, 2016 I have never had the need for one. If buying from Amazon pick one that is popular with a good owner satisfaction would be my recommendation. Let us know how you like your new subwoofers after everything is completed. Quote Link to comment Share on other sites More sharing options...
Tobias Posted April 24, 2016 Author Share Posted April 24, 2016 (edited) I have never had the need for one. If buying from Amazon pick one that is popular with a good owner satisfaction would be my recommendation. Let us know how you like your new subwoofers after everything is completed. I connected 1 sub without the Y splitter, same noise. A friend is travelling to USA, is there a subwoofer cable that solve this problem? Edited April 24, 2016 by Tobias Quote Link to comment Share on other sites More sharing options...
jason str Posted April 24, 2016 Share Posted April 24, 2016 A ground loop isolator is the best way. As long as your RCA cable is good you should be ready to go. 1 Quote Link to comment Share on other sites More sharing options...
jason str Posted April 24, 2016 Share Posted April 24, 2016 Just want to be sure here. Did you unplug the subwoofer input RCA and still had noise ? Quote Link to comment Share on other sites More sharing options...
Tobias Posted April 24, 2016 Author Share Posted April 24, 2016 Just want to be sure here. Did you unplug the subwoofer input RCA and still had noise ? Yes, no rca cable = no noise. RCA cable = noise RCA cable + avr power on = more noise Yesterday I watch some movie, in some scenes, the noise was heard. I'm reading some subwoofer cable's reviews in Amazon, they talk about the "shielded" and "gauge"... maybe I also try replacing the cables. 1 Quote Link to comment Share on other sites More sharing options...
jason str Posted April 24, 2016 Share Posted April 24, 2016 All is good then. Pick up the ground loop isolator and enjoy. Quote Link to comment Share on other sites More sharing options...
Tobias Posted May 3, 2016 Author Share Posted May 3, 2016 The only ground loop isolator in my local crap market is this: http://articulo.mercadolibre.com.ar/MLA-611713162-aislador-de-masa-para-potencias-blauline-gl-205-_JM They say it's for car audio... will it be compatible for home audio? Quote Link to comment Share on other sites More sharing options...
jason str Posted May 3, 2016 Share Posted May 3, 2016 Same thing but should not be expensive either. No access to Ebay or Amazon ? Quote Link to comment Share on other sites More sharing options...
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