Watching this post with interest. I have a Prima Luna integrated making hum. If you are successful getting your fixed, I'll send mine in (under warranty) to see if it is fixable.
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@oldschool1 The Torus TOT MAX you bought is certainly a nice power isolation transformer. Thing is though, in the case of hum, that can very well be caused by DC on the line, and I don’t believe the Torus has a filter for that. For another $120 you might as well get an Emotiva CMX-2. https://emotiva.com/products/accessories/cmx-2 I have one. It does work and even if it doesn’t in your particular case, it cant hurt. So essentially what I’m suggesting is use both the Torus and CMX-2. Torus plugged into CMX-2 of course. wolf_garcia recommended a PS Audio Humbuster III. Same concept/functionality. That too would be good if you can find one, but is likely more expensive than the Emotiva. |
dhal, Here is a more detailed description of the events leading up to my evaluation. I posted this in another forum explaining its wording: Yesterday I purchased a Torus TOT MAX. WOW, what an improvement it made to audio quality however, the "hum" is still there. This morning I got up extra early as it was very quiet in the room and outside so I figured it would be a great time to see to what degree this "hum" was. As luck would have it, I could hear the "hum" in my seating position 10 ft away from the A5, and it was running through the Torus. Correct me if I'm wrong but the Torus should have corrected the problem if it were a grounding issue. Here are the sequence of events leading to this problem. -Bought as a used unit, damaged in shipping -Took it to the only authorized Anthem repair facility in the US here in Los Angeles -Repaired successfully and ran beautifully until -Moved to a new home and the right surround was dead -Brought it back to the service center and they found no issues -Then they completely dismantled it and re assembled finding no issues -As soon as I got it home, I noticed the dreaded "hum" -I returned to the service center the following week and they plugged it in with no interconnects, only the AC power. We heard the hum. Of course we had to put our ears relatively close to the unit to hear. Problem was, there was ambient noise in the room so it wasn't as easy to hear. They said what I was hearing was perfectly normal. The skeptic that I am and never hearing this before, I had my doubts. Now that I've tested it with the Torus, heard the same hum as before at home and at the service center and the fact I never heard it before, tells me there's something not right. Today I sent an email to the service center asking what he suggests. Worst case scenario, I send it to Anthem Canada and get it corrected once and for all. They can expect a telephone call from me tomorrow discussing this and their suggestions. I know they are going to suggest sending it in, of course! They like the business. I don't mind the service bill, it's the shipping I have an issue with since its not exactly small or light weight. |
oldschool1, Is this what the inside of the amp looks like? http://www.studio-22.com/anthem/images/Anthem%20MCA%2050%20-%20Inside1.jpg If so notice the two toroidal transformers on each side. Pull the top off the amp and check the center mounting bolt and nut for tightness. Make sure the round top plate is seated properly on the top of the transformers. Maybe one of them is loose. After checking them, to make sure they are secure, power up the amp and listen to the two transformers. If the hum/vibration is still there listen to each transformer individually the best you can. First verify the hum is coming from one or both of the transformers. Is one louder than the other? If so recheck the mounting bolt and nut. Make sure the round top plate is seated properly on top of the transformer. |
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