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Post by garbulky on Apr 15, 2018 17:18:24 GMT -5
I only tested the power conditioners because of all the noises. And it is not only the A 300 - the transformer of A 150 is very loud, too. Unusual. What do you mean by loud? Do you mean that there is a mild soft hiss or very soft buzzing when you put your ear up to the tweeter? If so, that's normal. And I wouldn't expect things to change much with the DR-2. If it's louder than a mild hiss like a clearly audible noise there is an issue. Try disconnecting your RCA interconnects from your source and the from the amp. Leave only your speakers and power cable connected (directly to the wall no power conditioners). Do you still get the noise? If the noise goes away when the amp it wasn't the amp - it came from another source. From upstream. Like a ground loop. But it's not the amp's fault. If you do still have noise, then it's something to do with the amp, power cable or speaker cable. It could also be your power outlet. Try it on a different power outlet in another room. But this would be the test you want to do before buying a DR-2. Because I really doubt the DR-2 will solve it. Is your voltage 220? That also may be a strange interaction issue. I only tested on 110. I have used the A-300, A-150, UPA-2, UPA-500, XPA-1 LXPA-2, UPA-1, XPA-1, XPA-5 amps. None of them has caused noise. The only noise I have heard is a mild hiss when you put your ear right up to the tweeters. |
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Post by kellerkind on Apr 16, 2018 15:08:46 GMT -5
Perhaps my english is not good enough.
i do not speak about too much noise coming out from the Speakers (although the Emotivas are louder than my other amps from ASR Audio or Topping) -
im speaking from mechanical noises of the transformers coming out from the amp himself.
I have this noises, even than no loudspeaker is connected.
So my big hope is, that the DR 2 can solve my Problems.
Cheers
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Post by teaman on Apr 16, 2018 15:55:15 GMT -5
Perhaps my english is not good enough. i do not speak about too much noise coming out from the Speakers (although the Emotivas are louder than my other amps from ASR Audio or Topping) - im speaking from mechanical noises of the transformers coming out from the amp himself. I have this noises, even than no loudspeaker is connected. So my big hope is, that the DR 2 can solve my Problems. Cheers Sorry but your amp should not make any noise. |
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Post by davidl81 on Apr 16, 2018 15:59:26 GMT -5
Perhaps my english is not good enough. i do not speak about too much noise coming out from the Speakers (although the Emotivas are louder than my other amps from ASR Audio or Topping) - im speaking from mechanical noises of the transformers coming out from the amp himself. I have this noises, even than no loudspeaker is connected. So my big hope is, that the DR 2 can solve my Problems. Cheers Sorry but your amp should not make any noise. Is he maybe speaking about the "click" sound when you first power the amps on? If so that I can't see how that is any concern. It is a one second thing and then it is gone. |
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Post by Casey Leedom on Apr 16, 2018 16:43:15 GMT -5
Transformers can make noise. There's an alternating current flowing through the coils on one set of windings causing an alternating magnetic field which induces alternating currents/voltages on the output coils. It's the alternating magnetic fields which can cause the noise since they're interacting with any nearby ferromagnetic material and magnetic fields. Of course this is a known problem, so well-made transformers are built to avoid mechanically vibrating/buzzing themselves. (And, I believe, they also employ magnetic shielding/quenching to decrease problems with nearby parts. Someone far more knowledgeable will need to elaborate on transformer shielding.) For instance, you'll see transformers which are completely embedded in resins to prevent internal vibrations, etc.
One thing that strikes me as an interesting question for the Original Poster: what's you're local electrical grid? 60Hz/120V? 50Hz/240V? I know that the Emotiva amplifiers are rated to operate at both of those, but maybe 50Hz/240V didn't go through mechanical testing compliance?
Casey
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Post by earthboy on Apr 16, 2018 19:42:39 GMT -5
If the transformer is making more than a faint humming noise then the laminations have probably loosened. This is a defect which I think should be fixed by Emotiva under warranty.
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Post by kellerkind on Apr 17, 2018 1:33:02 GMT -5
Hey Casey,
yes, this is the Problem i talk about.
To your question - we have in Germany 230 Volts.
In my house are 227 Volts with 50 hz.
All Torodial transformers which i have or had in my house from Emotiva are making constantly noises.
It sounds like: "tttrrrtttrrrrrttttrrrrttttrrrrrrrttt"
So i have the big hope that the DR 2 - which has no torodoial transformer will work in silence.
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Post by Casey Leedom on Apr 17, 2018 2:25:41 GMT -5
Hhmmm, odd. I would have thought that 50Hz/240V testing would have been part of the testing matrix. To have a single transformer have an issue is one thing, but multiples is ... "odd" ...
Casey
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Post by mgbpuff on Apr 17, 2018 9:41:46 GMT -5
50 hz causes increased flux in a given transformer than does 60hz. This causes more magnetostriction and therefore more hum. Of course, the transformer that is advertized for 50/60 hz operation should be adequate for either frequency, but 50 hz operation will still cause more noise than 60 hz operation.
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Post by garbulky on Apr 17, 2018 10:18:18 GMT -5
Hey Casey, yes, this is the Problem i talk about. To your question - we have in Germany 230 Volts. In my house are 227 Volts with 50 hz. All Torodial transformers which i have or had in my house from Emotiva are making constantly noises. It sounds like: "tttrrrtttrrrrrttttrrrrttttrrrrrrrttt" So i have the big hope that the DR 2 - which has no torodoial transformer will work in silence. Ah so your transformer is buzzing not your speakers. Well the bad news is this is not supposed to be normal at all and should not be tolerated. None of my amps ever buzzed or made any noise from the transformer. I don't know how switching power supplies work. But whatever is causing the buzzing, I wouldn't bet all my money on a switching power supply fixing the problem. I would try to figure out the problem first. Perhaps it's something to do with your votlage. But the amps are supposed to work fine with your voltage. But either way, it's not normal. I don't know if this has anything to do with your situation but there is something called DC offset which can cause hum in transformers. To note - this would be due to a problem from your power from which is coming the DC offset (if that is the problem). Emotiva makes a power strip that takes care of this issue. It's called the CMX-2. They also have a CMX-6 but I don't think it takes care of DC offset. emotiva.com/products/cmx-2 Also if you are using a UPS back up with your amps, a lot of UPS output a SQUARE wave which is not reccomended. But you mentioned you are not. |
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Post by kellerkind on Apr 18, 2018 1:36:50 GMT -5
Hello Garbulky, DC Offset was my first thinking, so i tested for around 800 Euro the big HMS Energia DC Offset killer - you see it on the right side of the Picture.  It had no influence on my Problem. I also tested different netfilters from cheap Tagas(200 Euro) until very high priced DSS 4000 Watt filters (1.100 Euro) for amps.  All this did not help. I also used different power cables from Via Blue, MFE, ASR, Oehlbach , DSS, Gemkow from 50 - 500 Euro for one Meter. It also has no effect on the noises from the transformers for A 150, A 300 or TA 100. They make trrrtttttttrrrrrr and ssssssstrrrsttssss all day and night.  I changed the Phase, i tested in different rooms with different Equipments in my house - the Emotivas do make mechanical transformer noises. I also had a friend in my house, who was electrician - the Problem is definitive not coming from my net. By the way, im living in a Little village on the land with no industry. Cheers Werner |
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Post by rbk123 on Apr 18, 2018 8:54:21 GMT -5
Hey Casey, yes, this is the Problem i talk about. To your question - we have in Germany 230 Volts. In my house are 227 Volts with 50 hz. All Torodial transformers which i have or had in my house from Emotiva are making constantly noises. It sounds like: "tttrrrtttrrrrrttttrrrrttttrrrrrrrttt" So i have the big hope that the DR 2 - which has no torodoial transformer will work in silence. Have you brought it over to anyone else's house to see if it makes the same noise in there? |
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Post by kellerkind on Apr 19, 2018 1:37:36 GMT -5
Yes, i tested it in our other house some villages from here. Same game.
Now im waiting since 4 weeks or so for the new Emotiva DR 2 amps - but our Distributor gets non though Emotiva wanted to send them since many weeks.
Im very hot for the DR 2 because it do not work with torodial transformers.
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Post by garbulky on Apr 19, 2018 22:41:39 GMT -5
Yes, i tested it in our other house some villages from here. Same game. Now im waiting since 4 weeks or so for the new Emotiva DR 2 amps - but our Distributor gets non though Emotiva wanted to send them since many weeks. Im very hot for the DR 2 because it do not work with torodial transformers. Im guessing its a problem with emo gear and your 220 50 hz requirement power. I would suggest you contact emotiva and mention everything you did. Speak to Keith if you can. Hes good and an engineer. I dont think you should spend anymore money in emo gear until you figure this out. Id hate for it to happen to you again. |
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