jc4659, my guess is either you hit the nail on the head or it's a faulty component. Your suggestion is about the most logical given the history. Another thing I'd like to add, this unit replaced an Integra 50.3 AVR that was dead quiet. I don't believe this "hum" is normal and definitely not acceptable. I'll report the service centers response tomorrow. I believe they are a top notch shop however it's my assumption the tech may have missed something. Whatever the case it's gonna be fixed even at the cost of shipping from Los Angeles to Anthem in Canada and back.
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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. |
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