Marantz av20 audessey x setup tuning problems

[TLS Guy]

Pics. Sorry its mess right now. Been trying diferent wires and need to clean it back up once I fix this.

You are falling into a common trap, of adding and adding grounds, that seldom solves the problem.

You now have a complex system, and to make this work and have a silent background, then you have to design a ground plane and that takes skill and expereince.

It is clear to me that plate amp ground is not at the same potential as the rest of your system. That is caused by a resistance to ground between the receptacle the plate amp is plugged into and the rest of the system. So you best bet is to power that plate amp from a cable going back to your main system.

The more complex the system, the more likely you are to run into ground loops.

One approach might be to lift the ground in the xlr plug at the plate amp connection.

You usually solve these problems by removing grounds and not adding them paradoxically.

 

[ssmokeyy]

You are falling into a common trap, of adding and adding grounds, that seldom solves the problem.

You now have a complex system, and to make this work and have a silent background, then you have to design a ground plane and that takes skill and expereince.

It is clear to me that plate amp ground is not at the same potential as the rest of your system. That is caused by a resistance to ground between the receptacle the plate amp is plugged into and the rest of the system. So you best bet is to power that plate amp from a cable going back to your main system.

The more complex the system, the more likely you are to run into ground loops.

One approach might be to lift the ground in the xlr plug at the plate amp connection.

You usually solve these problems by removing grounds and not adding them paradoxically.

I did try changing the outlet the plate amp is plugged into. Still had the noise. I could try to plug it into the apc conditioner but my fear is that it wont be able to pass the amps needed to drive the amp fully.

Im trying to get what u mean by the resistance to ground between the receptacle and the system. Like meaning it could be loose or bad quality outlet. Every outlet is heavy duty or ps audio 20 amp model. But again I have tried changing the outlet the plate amp is plugged into and still has the noise but the other plate amp does not has noise.

I have been looking into xlr ground lift devices. Not sure what model is a quality part. Never had to use one or sell one before. Do u have any u recommended?

 

[TLS Guy]

I did try changing the outlet the plate amp is plugged into. Still had the noise. I could try to plug it into the apc conditioner but my fear is that it wont be able to pass the amps needed to drive the amp fully.

Im trying to get what u mean by the resistance to ground between the receptacle and the system. Like meaning it could be loose or bad quality outlet. Every outlet is heavy duty or ps audio 20 amp model. But again I have tried changing the outlet the plate amp is plugged into and still has the noise but the other plate amp does not has noise.

I have been looking into xlr ground lift devices. Not sure what model is a quality part. Never had to use one or sell one before. Do u have any u recommended?

You never plug power amps into conditioners. Those are for the fragile low power circuits.

No, I don't because I generally make my own cables.

This one is available from B & H photo that are a good outfit. That is what to try next.

 

[ssmokeyy]

Integra was a 2 prong av20 is a 2 prong.

 

[TLS Guy]

Integra was a 2 prong av20 is a 2 prong.

It looks as if that plate amp is three prong. If that is the case, then I can be certain, that XLR ground break will take care of your noise problem.

 

[ssmokeyy]

So i installed a cheater 3 to 2 prong adapter. noise is gone. But I don't want to lose the ground. I also ordered the xlr part. But I have found that if I plug the av20 and plate amp in the same outlet the loop is gone.

 

[TLS Guy]

So i installed a cheater 3 to 2 prong adapter. noise is gone. But I don't want to lose the ground. I also ordered the xlr part. But I have found that if I plug the av20 and plate amp in the same outlet the loop is gone.

Then you have proved what I was telling you, that ground loops are caused by grounds at a different potential.

 

[ssmokeyy]

U were correct. I wasn't saying u were wrong. Just sucks that the ground wire from the av20 to the plate didnt work. So now I need to change some thing and find a good power conditioner/ high out part that can run both items.

 

[TLS Guy]

U were correct. I wasn't saying u were wrong. Just sucks that the ground wire from the av20 to the plate didnt work. So now I need to change some thing and find a good power conditioner/ high out part that can run both items.

I don't know what you are up to. Power amps do not need, and should not be connected, to any sort of power conditioner. The power supplies of decent power amps, are more then up to the task. It is bad practice to do what I think you are trying to do. This will cost a lot of money to cause problems. This is in fact one of the huge arguments for separate preamps and power amps. The more preamps and processing circuits benefit, but power amps do not. You are making this too complicated and making for inferior engineering.

 

[ssmokeyy]

Im always on the side of amps always go to wall and u protect avp and anything computer based. But this problem is driving me nuts. I want to do it correctly but the noise wont go away and I do not feel good about not using the ground. I do not like bandaid for problems. I know the power conditioner is another kind of bandaid but some of these boxes have storage banks for rush current. Way over priced.

 

[TLS Guy]

Im always on the side of amps always go to wall and u protect avp and anything computer based. But this problem is driving me nuts. I want to do it correctly but the noise wont go away and I do not feel good about not using the ground. I do not like bandaid for problems. I know the power conditioner is another kind of bandaid but some of these boxes have storage banks for rush current. Way over priced.

Sorry, but you have no clue. You don't seem to have the knowledge to design and install a good quality system.

The power supplies of well designed amps will do everything and more than a power conditioner. Power amps all have huge caps for rush current. If they did not they would be no good. You will need to use grounds correctly and not causing issues with grounds at different potentials. You can ground your plate amp. But you you can prevent the loop and hum with that xlr ground break. There is nothing dangerous or wrong with that. It is the correct solution to your problem, In fact if you do what you propose you will recreate your ground loop and the noise.