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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
tomiiv30 OP
65 posts
 
No need to name names for the dealer, they have done so much actually they have done as much as they knew because they have not been trained by McIntosh to deal with this kind of situations. They did not know about this problem until I brought it up to them, and even them can’t get any clear answers back from McIntosh as to how this should be dealt with. All McIntosh did was to tell me and my dealer that I have DC on my mains and how they know if I have Dc offset I have no idea they never came to my house to check, and that was that no more interactions. It looks like I am on my own.
They replaced two units so far one being the one discussed in this thread and another one that had loose parts.

If you did not read my previous posts, this unit that buzzes like crazy at my house and at two different houses, did not buzz at the dealer at all and it was dead quite - How is that possible I have no idea and I think that even if I return this unit back to the manufacturer they would say the same thing that this unit works properly.
Also the warranty time that it would take to send and receive the unit back it would be about a year or maybe 6 moths the least.


clearthink
1,421 posts
 
tomiiv30 "No need to name names for the dealer"

As Americans would say I am going to call bs on all of your claims there is no substance, basis, or evidence for you're claims you came hear bashing McIntosh but if you're claims were valid, authentic, and genuine then you're dealer sold you defective merchandise and is required, obligated, and bound to either facilitate, effectuate,. and accomplish a satisfactory repair, replacement or refund and you're refusal to name the dealer reflects this hidden agenda of your's. The other possibility is that you purchased a used, demo, or preowned unit which then may have been modified, damaged, or altered in such a way that the problems you claim resulted.
4krow
80 posts
 
And round and round we go. It's this, it's that, believe me. You made a simple case for me anyway. You took the unit to 3 different houses miles apart from each other with the same humming result. What more has to said? Defective unit, no?
clearthink
1,421 posts
 
4krow "What more has to said? Defective unit, no"
If the claim that it was defective was valid, authentic, and genuine then why wouldn’t this person who came hear only to complain return the unit to McIntosh for repair, adjustment, or replacement and why wouldn’t he name the dealer who sold him this defective, damaged, or inferior unit?
jea48
4,425 posts
 
stereo52,670 posts01-05-2019 3:11pm

I hope Tom bought it from a very good dealer with a lot of cash flow. Some stores would be unable to refund that amount of money as many rob Peter to pay Paul. I hope for a happy ending.
The dealer in my area has a no return policy. You buy it, you own it. And they are not small by any means. They probably have a million dollars of audition demo equipment and speakers in various rooms in the store. They probably sell more ARC equipment in the Midwest than anyone else. And yes they sell McIntosh.

I asked the dealer, several years ago, why he didn’t have a return policy like the other dealer in our area. They offer a 7 day return policy. The dealer responded with another question to me.
"What does he do with a returned piece of sold equipment?"
"Repackage it and resale it for new?"
"Put it on the floor and sell it as a demo?"
Once it was sold and taken home by a customer it became used. And then he said something like, used is used.
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