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DC Offset Blocker/Killer - where to buy in the USA

   I have McIntosh MC8207, the first unit I bought from an authorized dealer came with a loud buzzing coming from the left transformer, and was replaced with a new unit which came with even a louder buzzing. The buzzing can be heard from 8 feet away. Then I was told to have install new 20 amp outlet that has its own isolated grounding.
   That was done professionally by an electrician who installed two isolated 20 amp outlets, two 20 amp circuit breakers, two copper polls for grounding for each outlet, each outlet has its own neutral and power line. After all this done the buzzing sound was still there.
   I was then told to buy a power conditioner which I did (Audio Quest Niagara) which was like $4000 and that did not help. Called back McIntosh and was told that I might have DC offset in my AC line and was told by McIntosh that I would need a DC Offset Blocker/Killer to which when I asked them where to buy one they told me to go on the internet and search to find one, to which I cannot find one.
  This bothers me a little bit, if you as a company think that I have dc in my ac and i need a dc blocker wouldn't you need to sell one as well. I brought this amp to my friends house and it was the same no improvement, so my guess is that he has dc in the ac line as well.
   So If anyone of you knows where to buy a DC Offset Blocker/killer please let me know, but even if this helps kill the buzzing wouldn't you guys think that this expensive somewhat hifi amp/brand should be silent from the factory. I mean this is two units in a row all purchased brand new.

My house is 5 years old, everything is brand new, the whole neighborhood is about 8-9 years old, my electrician says that I have perfect power coming to the house and everything looks fine.

Thank You

tomiiv30
gdnrbob
4,411 posts
 
Are there any repairmen who specialize in Mac's?
I can see the OP's reluctance to send into McIntosh, all they are going to do is open the box and slap a label on it saying it is okay.
Though it would cost some money having someone look at it, at least you know if it, indeed, has a problem. And, using that information tell McIntosh. Who knows? They might find the issue and repair it.
B
tomiiv30 OP
65 posts
 
I have made up my mind about this brand not just this amplifier. To answer to @cleeds I have done only one outlet that does not meet NEC standards which was un-installed completely and is no longer in existence and everything else is back to normal, but the amp is still buzzing. The amp buzz has nothing to do with what I have done with the electrical it just cost me money that’s all, money can be made but the experience I’ve had so far with this brand alone is unforgettable and was unpleasant. After spending so much money and not even one phone call was made back to me that should tell you something.
The amp just sits in the corner collecting dust and if you wanna buy it it’s yours for $5K
jea48
4,281 posts
 
@ cleeds
You want to know so bad where the OP bought the amp why don’t you call the two dealers tomorrow and find out which one of the two sold the piece of cramp McIntosh MC8207 to Bill, the OP.

As for sending the amp back to McIntosh what part of it would be a waste of time don’t you understand?

The thing weighs 100lbs. What do you think it will cost to send that boat anchor insured back McIntosh and pay to have it shipped back insured?
Hell, why don’t you and jetter step up and be good guys and pay the shipping + insurance cost to send the amp to McIntosh, both ways.



Goggle search, Two McIntosh dealers in Chicago Illinois.


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jea48
4,281 posts
 
@ tomiiv30

Have you by chance sent a PM to gbart about building you a DC blocker for the McIntosh amp?


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stereo5's avatar
stereo5
6,260 posts
 
@tomiiv30I...………………………..

I would call McIntosh and talk to one of the higher ups and get some action. No one is going to call you if you don’t keep on their ass. You have a brand new amp collecting dust in the corner, not doing anything isn’t the answer. I would call and ask to speak to the persons supervisor, then when the supervisor comes on, I would ask for their supervisor. Once you are at the top, express your concerns and disappointment without getting angery (at first). See what happens. As a last resort, you could tell them you are going to plaster your story all over social media, the online forums, the works. Trust me, they will change their tune fast.
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