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Post by Priapulus on Oct 8, 2014 9:08:26 GMT -5
CMX-2 & CMX-6 look like surge protectors, but when I read the fine print, their web page clearly states that these are filters, and say nothing about surge protection. It's curious to me that they don't include $4 worth for MOV's to provide some level of protection. But perhaps I've misread the website.
KeithL has claimed that they do surge protection so perhaps I'm wrong;
"My conclusion would be that, unless you know that you have specific problems to address, it always makes sense to use a relatively simple surge suppressor and line filter from a reputable manufacturer. Our CMX-1 and CMX-2 are quite nice, look cool, and will also do an excellent job (they cost a little more, but are aesthetically much nicer)." emotivalounge.proboards.com/thread/38206/amplifiers-surge-protectors
As have often mentioned on these pages, a common cause of ground-loop hum is the CATV coax shield. I'm no expert, but it seems to me that a couple of CATV connectors on the CMX-2 or CMX-6, to bond the CATV coax to the CMX power ground would be an ideal way to solve that problem.
Finally, although the EMO power cords have three pins at the wall, many of the EMO appliances (e.g. XSP-1) do not connect to that powercord ground. I presume this is done to eliminate a possible ground loop path. But it also eliminates the possibility of using the CMX-6 as a single-point ground, via the powercords.
Again, I'm no expert about these things; perhaps someone could give some insight.
Sincerely /blair |
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geebo
Emo VIPs 
"Too bad that all the people who know how to run the country are driving taxicabs and cutting hair"
Posts: 24,261
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Post by geebo on Oct 8, 2014 9:21:09 GMT -5
Are you sure Keith said they have surge protection? I've never seen any such claim by Emo for those products. They have said, however, that their gear has the necessary protection built in.
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Post by aud on Oct 8, 2014 9:28:35 GMT -5
Please Google "Understanding, Finding and Eliminating Ground Loops in Audio and Video Systems". Please read the complete article.
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Post by Priapulus on Oct 8, 2014 10:22:50 GMT -5
Please Google "Understanding, Finding and Eliminating Ground Loops in Audio and Video Systems". Please read the complete article.
Thank you; it's one of the best I've seen on the subject.
Sincerely /b
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Post by westom on Oct 9, 2014 8:39:51 GMT -5
It's curious to me that they don't include $4 worth for MOV's to provide some level of protection. But perhaps I've misread the websitep From that Generic Jensen article on Ground loops and other grounding principles on page 40: Noise filters (ie CMX-2) and surge protection are about two completely different anomalies that require different solutions. Figure on page 17 is relevant. For example, A connects to B that connects to C that connects to A. Break the connection between A and B. Hum (noise) disappears. Does that solve the problem? Of course not. That may cure a symptom. Noise is actually created by a defect in C. Curing a symptoms is only a observation. Provides an important fact. On page 12: That observation must be combined with other facts to create a solution. This difference between observation, symptom, and a solution is why ground loops and other problems sometimes can be difficult. |
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Post by Priapulus on Oct 9, 2014 9:10:51 GMT -5
From that Generic Jensen article on Ground loops and other grounding principles on page 40: And the thoughtless (incorrect wearing) of seatbelts risks human damage. I get it, you don't like surge protectors. There are people that refuse to wear seatbelts. /b
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Post by westom on Oct 9, 2014 22:15:57 GMT -5
I get it, you don't like surge protectors. Where did that speculation come from? I recommended protectors ... that actually are effective as part of a protection system. A completely different device, unfortunately also called a surge protector, does not even claim to protect appliances. Two completely different devices. One actually does protection from typically destructive transients. A Jensen discussion says why the completely different device with a same name does almost nothing and can even make appliance damage easier. Protectors also do nothing for ground loops, hum, and other noise problems. Summarized was why a ground loop is sometimes difficult to solve. Disconnecting something can temporary interrupt a hum or ground loop created by something else not even connected to that disconnected wire. Jensen article discussed two completely different anomalies - transient protection and noise / hum / ground loop problems. Two completely different anomalies that involve different electrical concepts and require different solutions. |
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