|
|
Post by alucard on Jul 9, 2017 14:46:59 GMT -5
Funny you mention that. I ordered one yesterday (amazon) and will be here tomorrow. |
|
|
|
Post by alucard on Jul 9, 2017 15:50:13 GMT -5
Also try that manual ground fault protector from Home Depot...you can always return it if it does not work. Is that the yellow cable you posted? I could not find it in a search at homedepot.com. Suppose I could just swing by the store and look. I found it at the local store but it did not help with the speaker hum.  |
|
|
|
Post by leonski on Jul 9, 2017 16:03:49 GMT -5
Funny you mention that. I ordered one yesterday (amazon) and will be here tomorrow. Check many outlets. The 'problem', if it exists at all, might be on only ONE circuit and the rest are OK. Even one outlet on a string of 'em might be mis-wired. |
|
|
|
Post by Axis on Jul 9, 2017 16:19:13 GMT -5
This thread has been very informative and I am curious about the culprit. I am thinking if Sherlock Holmes was on the case he would figure it out !  He looks through all the fog and "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth." - Arthur Conan Doyle |
|
|
|
Post by socketman on Jul 9, 2017 17:58:07 GMT -5
I lived in a house that was built in the early 60's and had nothing but issues with wiring noise. I bought a house thats 18rys old and its as quiet as a mouse and i have stereos and HT all over the house . My TT setup which is most prone to interference is dead quiet ,5.1 in bedroom is silent, basement HT is silent kids rooms with HT is silent. This is old house syndrome and if you have the money get a dedicated line run for the HT or lift the ground. With some luck the CMX2 will do the trick. Look forward to hearing your outcome.
|
|
|
|
Post by alucard on Jul 9, 2017 18:00:47 GMT -5
The house ground is the culprit and no it is not really dangerous to leave the ground lifted. If it works, leave it. Or better yet, plug the XMC-1 into a CM2. I think I misunderstood when I first read. Are you saying the CMX-2 could be used in place of the ground lift plug or used in conjunction with it? Thanks |
|
DYohn
Emo VIPs 
Posts: 18,489
|
Post by DYohn on Jul 9, 2017 18:04:23 GMT -5
The house ground is the culprit and no it is not really dangerous to leave the ground lifted. If it works, leave it. Or better yet, plug the XMC-1 into a CM2. I think I misunderstood when I first read. Are you saying the CMX-2 could be used in place of the ground lift plug or used in conjunction with it? Thanks If you still have one try it in place of. |
|
|
|
Post by alucard on Jul 9, 2017 18:44:44 GMT -5
I think I misunderstood when I first read. Are you saying the CMX-2 could be used in place of the ground lift plug or used in conjunction with it? Thanks If you still have one try it in place of. I dont, otherwise I would have tried already  I had the CMX in my cart and was reading about Hum-X at the same time. Then was asking myself 'does the CMX fix ground loop issues' and I think the answer probably no after reading the description again. The purpose of Hum-X is to resolve ground loops. |
|
|
|
Post by bluemeanies on Jul 10, 2017 5:56:19 GMT -5
Is that the yellow cable you posted? I could not find it in a search at homedepot.com. Suppose I could just swing by the store and look. I found it at the local store but it did not help with the speaker hum. Sorry to hear this did not work. I have not kept up with all of the post on your problem. If the hum is coming from the speaker the idea of a dirty line is not the problem that affects the amplifier. I had that issue myself l did mention the HUM-X. That product did not work for me. Sorry to ask this but did you tear down your system and start one by one I troducing each piece of equipment listening for that hum? Do you have a grounding rod connected to your circuit breaker box? Check each outlet that you are using for your system and make sure the ground wire is connected to the receptacle. This is a puzzle where you need to throw everything at the wall and hope something sticks. Keep us in the loop. |
|
|
|
Post by westom on Jul 10, 2017 7:55:46 GMT -5
Then was asking myself 'does the CMX fix ground loop issues' and I think the answer probably no after reading the description again. At what point does it become obvious that so many are recommending solutions that did not even work for them? Household wiring is unrelated to your symptoms. Stop trying to fix what is not broken. Move on to what causes that noise. Is your problem a buzz (as originally reported) or a hum? Those are different symptoms of different problems. Ground lift is a diagnostic tool. It does not fix anything. But many do it to cure a symptom - to ignore an actual problem that is not created by household wiring. Earth ground is not a receptacle's safety ground. Safety ground does not create your symptoms. Three light tester can detect only some household wiring defects. It obviously cannot say a receptacle is good. What it reports is irrelevant to your symptoms. Your picture of amp, preamp, and outlet is wrong. Each red line should be three red lines. Three wires exist into the receptacle. Each one must be handled as if different. RCA plug is two completely different 'blue' wires. Both must be treated as if different to perform any kind of informative analysis. Is it a hiss, buzz, or a hum? All are completely different defining completely different anomalies. |
|
|
|
Post by alucard on Jul 10, 2017 8:07:28 GMT -5
|
|
|
|
Post by westom on Jul 10, 2017 8:13:17 GMT -5
OK. Is it constant? Does any household appliance or anything else on the street cause it to be intermittent? |
|
|
|
Post by alucard on Jul 10, 2017 8:17:32 GMT -5
OK. Is it constant? Does any household appliance or anything else on the street cause it to be intermittent? It is 100% constant unless I 1) add Jenson isomax on the interconnects or 2) use 2 prong ground lift on the preamp [tested with one speaker only]. |
|
|
|
Post by westom on Jul 10, 2017 8:39:07 GMT -5
It is 100% constant unless I 1) add Jenson isomax on the interconnects or 2) use 2 prong ground lift on the preamp [tested with one speaker only]. Then the defect is in hardware. Most likely defective is the pre-amp. More testing would say more. Again, it is not one red wire from pre-amp to receptacle. Three exist. There is not one blue RCA plug wire. Two exist. Your testing should include eliminating only one at a time to determine which (and it can be many) wires are relevant to that buzzing. This to identify what section of the pre-amp has a defect. Then, if necessary, eliminate two at a time. Good diagnostic procedure never tries to fix something up front. First the defect must be identified. Fixing comes much later. |
|
|
|
Post by alucard on Jul 10, 2017 9:39:47 GMT -5
It is 100% constant unless I 1) add Jenson isomax on the interconnects or 2) use 2 prong ground lift on the preamp [tested with one speaker only]. Then the defect is in hardware. Most likely defective is the pre-amp. More testing would say more. Again, it is not one red wire from pre-amp to receptacle. Three exist. There is not one blue RCA plug wire. Two exist. Your testing should include eliminating only one at a time to determine which (and it can be many) wires are relevant to that buzzing. This to identify what section of the pre-amp has a defect. Then, if necessary, eliminate two at a time. Good diagnostic procedure never tries to fix something up front. First the defect must be identified. Fixing comes much later. Thanks, Westom. Since this is an Emotiva preamp can we have Keith or another technical representative comment on this? I can take a look under the hood if needed. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jul 10, 2017 10:52:18 GMT -5
Then was asking myself 'does the CMX fix ground loop issues' and I think the answer probably no after reading the description again. At what point does it become obvious that so many are recommending solutions that did not even work for them? Household wiring is unrelated to your symptoms. Stop trying to fix what is not broken. Move on to what causes that noise. Is your problem a buzz (as originally reported) or a hum? Those are different symptoms of different problems. Ground lift is a diagnostic tool. It does not fix anything. But many do it to cure a symptom - to ignore an actual problem that is not created by household wiring. Earth ground is not a receptacle's safety ground. Safety ground does not create your symptoms. Three light tester can detect only some household wiring defects. It obviously cannot say a receptacle is good. What it reports is irrelevant to your symptoms. Your picture of amp, preamp, and outlet is wrong. Each red line should be three red lines. Three wires exist into the receptacle. Each one must be handled as if different. RCA plug is two completely different 'blue' wires. Both must be treated as if different to perform any kind of informative analysis. Is it a hiss, buzz, or a hum? All are completely different defining completely different anomalies. I agree with most of your evaluation Circuit ground & chassis ground are/can be totally different, but can be the same depending on pwr supply design. Safety ground & Earth ground are the same thing. Bypassing any electronics equipment chassis ground prong is just plain dumb- don't do it.. The chassis ground is what the shielding is electrically connected to, remove the ground, you loose shielding. |
|
|
|
Post by alucard on Jul 10, 2017 12:52:59 GMT -5
I agree with most of your evaluation Circuit ground & chassis ground are/can be totally different, but can be the same depending on pwr supply design. Safety ground & Earth ground are the same thing. Bypassing any electronics equipment chassis ground prong is just plain dumb- don't do it.. The chassis ground is what the shielding is electrically connected to, remove the ground, you loose shielding. Probably best that I send in the XMC-1 for inspection. |
|
|
|
Post by novisnick on Jul 10, 2017 12:55:44 GMT -5
I agree with most of your evaluation Circuit ground & chassis ground are/can be totally different, but can be the same depending on pwr supply design. Safety ground & Earth ground are the same thing. Bypassing any electronics equipment chassis ground prong is just plain dumb- don't do it.. The chassis ground is what the shielding is electrically connected to, remove the ground, you loose shielding. Probably best that I send in the XMC-1 for inspection. Perhaps, but Ill bet you a bag of doughnuts they find nothing wrong with the XMC-1.  |
|
|
|
Post by alucard on Jul 10, 2017 13:16:26 GMT -5
Probably best that I send in the XMC-1 for inspection. Perhaps, but Ill bet you a bag of doughnuts they find nothing wrong with the XMC-1. View AttachmentIs there anything I can do to test it? I have a digital voltage meter if that helps. |
|
|
|
Post by novisnick on Jul 10, 2017 13:24:16 GMT -5
Perhaps, but Ill bet you a bag of doughnuts they find nothing wrong with the XMC-1. Is there anything I can do to test it? I have a digital voltage meter if that helps. I had a Yamaha 3020 and an XSP-1 gen 2 that NEVER got right! Ive tried everything (almost) thats been listed , even the suggestion of a frame wire connecting the two units. No problem when only one was powered up but when both were I could hear that humm, couldn't hear it during movies but I knew it was there. So it was tolerated for HT but I have since sold the XSP-1. Replaced them both with the XMC-1 which is a wonderful hi end piece of audio gear! |
|
He looks through all the fog and "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth." - Arthur Conan Doyle
