hdmi buzz

[moreira85]

You said you unplugged the cable box- power cord, or coax feed? Disconnect the cable feed and see if the noise goes away. If it does, call the cable company and tell them to ground their feed, as required by the National Electric Code.

I have satellite, I disconnected the cable w no improvement.

 

[moreira85]

That thickens the plot enormously. You have a floating line. These are highly problematic and we need to know the exact details. I suspect this floating line is constructed improperly.

This just shows that in these types of posts we need the greatest detail.

Our replies will only be as good as the details of the post.

I'm not following the floating line thing? The behringer eq says requires an input and output for the sub cable, so there are two cables for the sub. Am I missing something?

 

[moreira85]

buzz

Like I said when I unplug the sub pre out the buzzing stops. The sub cable runs through the behringer feedback destroyer. So I hooked the sub cable back up so it would buzz again and unplugged the behringer power cable which has 3 prongs and the buzzing stops. So the question is what is the next step since I have isolated it to the bfd?

 

[TLS Guy]

I'm not following the floating line thing? The behringer eq says requires an input and output for the sub cable, so there are two cables for the sub. Am I missing something?

Probably.

Here is an XLR connector.

Now your Behringer unit has balanced xlr and 1/4" inputs and no unbalanced ones.

Now your receiver is unbalanced and so is you sub.

So the lines have to be floated in and out of the Behringer.

So the live pin of the RCA jack coming out of your receiver need to connect to pin 2 of the xlr or the tip of a 1/4 inch plug. The screen needs to be connected to pins 1 and 3 of the xlr or the ring and body of a 1/4 inch plug.

Now when you go from the Behringer to the sub it is best to use a balanced cable (2 conductors and screen). Connect the live conductor to pin2 xlr or tip of 1/4 inch plug. Connect the screen to pin 1 of xlr or body of 1/4 inch plug. Connect the other conductor to pin 3 of the xlr or the ring of a !/4 inch plug. At the sub end connect the conductor from pin 2 or tip to the live end of the RCA. Connect the cable from pin 3 (or ring) and the screen to the shield of the RCA plug.

You will always get the best signal to noise if you combine pin 1 and 2 at the input.

Commercial cables vary and it is best to make the cables yourself, then you know it is right.

If you get hum after that, and you might, then your options are to use highz/lowz transformers in and out of the Behringer, or lift the ground of the Behringer unit.

The type of lines I described are called floating lines, and are the correct way to go form unbalanced to balanced and balanced to unbalanced.

Unfortunately mixing balanced and unbalanced equipment often gives rise to problems. Decent units should have balanced and unbalanced connections. Balanced systems in domestic equipment often leads to these types of problems.

 

[moreira85]

Probably.

Here is an XLR connector.

Now your Behringer unit has balanced xlr and 1/4" inputs and no unbalanced ones.

Now your receiver is unbalanced and so is you sub.

So the lines have to be floated in and out of the Behringer.

So the live pin of the RCA jack coming out of your receiver need to connect to pin 2 of the xlr or the tip of a 1/4 inch plug. The screen needs to be connected to pins 1 and 3 of the xlr or the ring and body of a 1/4 inch plug.

Now when you go from the Behringer to the sub it is best to use a balanced cable (2 conductors and screen). Connect the live conductor to pin2 xlr or tip of 1/4 inch plug. Connect the screen to pin 1 of xlr or body of 1/4 inch plug. Connect the other conductor to pin 3 of the xlr or the ring of a !/4 inch plug. At the sub end connect the conductor from pin 2 or tip to the live end of the RCA. Connect the cable from pin 3 (or ring) and the screen to the shield of the RCA plug.

You will always get the best signal to noise if you combine pin 1 and 2 at the input.

Commercial cables vary and it is best to make the cables yourself, then you know it is right.

If you get hum after that, and you might, then your options are to use highz/lowz transformers in and out of the Behringer, or lift the ground of the Behringer unit.

The type of lines I described are called floating lines, and are the correct way to go form unbalanced to balanced and balanced to unbalanced.

Unfortunately mixing balanced and unbalanced equipment often gives rise to problems. Decent units should have balanced and unbalanced connections. Balanced systems in domestic equipment often leads to these types of problems.

Thanks, I'm going to have to study this response for awhile before doing anything.

 

[moreira85]

ground

So I am not really sure about building my own wire. How would running a ground from the bfd frame to the ground terminal of the receiver work? And is it safe? 2 young kids around

 

[TLS Guy]

So I am not really sure about building my own wire. How would running a ground from the bfd frame to the ground terminal of the receiver work? And is it safe? 2 young kids around

You can try it but I doubt it will work. If you don't have a multi meter, then get one and check out how the cables are connected. If they are incorrect and you don't think you can rewire them, you are welcome to send them to me and I will correct them.

 

[moreira85]

adapter

Thanks TLS
You were right creating ground bridge was no differ. I just want to be sure that ifi make the cable that will solve the issue. Any experience with these adapters? Will it work just,as well?
Whirlwind Lifter | Sweetwater.com

 

[TLS Guy]

Thanks TLS
You were right creating ground bridge was no differ. I just want to be sure that ifi make the cable that will solve the issue. Any experience with these adapters? Will it work just,as well?
Whirlwind Lifter | Sweetwater.com

That will not work for you, it will make it worse.

What you could do is use one of these.

You will also need one of these.

One will plug into the input and the other to the output of your Behringer, then you can go unbalanced from your receiver to the Behringer and unbalanced from the Behringer to your sub.

 

[moreira85]

That will not work for you, it will make it worse.

What you could do is use one of these.

You will also need one of these.

One will plug into the input and the other to the output of your Behringer, then you can go unbalanced from your receiver to the Behringer and unbalanced from the Behringer to your sub.

Thanks, the second link didn't have a product.

 

[TLS Guy]

Thanks, the second link didn't have a product.

Both links work for me.

this is the second product.

A3F XLR Jack-to-1/4" Plug Adapter/Transformer - RadioShack.com

This is the first one.

You need one of each, one for the output of the Behringer and one for the input.

 

[moreira85]

transformer

For some reason I can't find the second one . Even on radioshack site. It does come up in the,UK. So I am just buying one of the first link and one of the second correct? I was confused as to why the second one has a male plug? Does that go into the sub then attach to an xlr cable coming from bfd output cable?
I'll have to go there.

 

[TLS Guy]

For some reason I can't find the second one . Even on radioshack site. It does come up in the,UK. So I am just buying one of the first link and one of the second correct? I was confused as to why the second one has a male plug? Does that go into the sub then attach to an xlr cable coming from bfd output cable?
I'll have to go there.

The one with the female 1/4 socket goes to an input on you Behringer.

The one with the 1/4 male plug goes to the corresponding output.

So you need RCA from receiver to 1/4" mono phone jack male at your Behringer.

From the Behringer you need a 1/4" female mono phone socket (in line) to RCA at your sub.

Then you are done. Radio Shack are no longer on the UK, they left the UK sometime ago. They got beaten up by Maplins.

If you are in the UK Maplins may have balanced to unbalanced xlr converters also similar to what I showed you. If you want the Radio Shack products I think you will have to order them from the US.

What you are looking for and what those device are is: -

1). An unbalanced to balanced in line transformer.

2) A balanced to unbalanced in line transformer.

That really is the best way to do it, although floating lines usually work quite well, but floating lines msut be engineered correctly or you will have problems and sound quality be affected.

Now I have used those Radio Shack transformers and they are actually very high quality. There are a lot of small puny transformers around which will severely reduce bass, which is the last thing you want or a sub connection.

 

[moreira85]

1/4 inch

Forgive me if I am a little slow at this. So am not using the xlr input output on bfd but the 1/4 inch instead? How does a female 1/4 inch go from output of bfd? I'll probably understand more after I get them.

 

[TLS Guy]

Forgive me if I am a little slow at this. So am not using the xlr input output on bfd but the 1/4 inch instead? How does a female 1/4 inch go from output of bfd? I'll probably understand more after I get them.

You would need to use the xlr inputs with the devices I showed you.. Your unit has balanced 1/4 phone sockets. So if you use those, then you need stereo 1/4 inch jacks with tip, ring and body, like stereo headphone jacks.

The body is the same as pin 1 of the xlr, the ring is the same as pin 3 of the xlr and the tip is the same as pin 2 of the xlr. The are three connections in a balanced arrangement. +/- conductors and a screen.

The specs, say nothing about this unit having an unbalanced input. However I downloaded the manual and if you use a mono 1/4 plug it will make a floating line of 30 K ohms input impedance and 30 ohms unbalanced output impedance. However this unit is really conceived as a balanced unit.

What I would do next is lift the ground to that unit. In the UK you will need to fit a new MK plug and not connect the wire to the long ground pin. That will almost certainly solve your problem. Just make sure that the unit is only switched on when connected to a grounded unit.

 

[moreira85]

The one with the female 1/4 socket goes to an input on you Behringer.

The one with the 1/4 male plug goes to the corresponding output.



QUOTE]

I am in the US not UK. I was just saying that my web search on radio shack could only find it in the UK.
so the XLR side of the adapter plugs into the xlr input of the bfd, how does the rca from the receiver plug into a 1/4 female socket isnt the rca smaller than 1/4 inch?
So the XLR side of the trasnformer/adapter plugs into the bfd xlr output? how does 1/4 maile plug plug into the rca going to the sub?




When you say I need 1 each, 1 for the input and 1 for the output do you mean I need 1 of each kind for the input and 1 of each kind for the output for a total of 4 pieces or just 2?

 

[TLS Guy]

The one with the female 1/4 socket goes to an input on you Behringer.

The one with the 1/4 male plug goes to the corresponding output.



QUOTE]

I am in the US not UK. I was just saying that my web search on radio shack could only find it in the UK.
so the XLR side of the adapter plugs into the xlr input of the bfd, how does the rca from the receiver plug into a 1/4 female socket isnt the rca smaller than 1/4 inch?
So the XLR side of the trasnformer/adapter plugs into the bfd xlr output? how does 1/4 maile plug plug into the rca going to the sub?

When you say I need 1
each, 1 for the input and 1 for the output do you mean I need 1 of each kind for the input and 1 of each kind for the output for a total of 4 pieces or just 2?

To this connector.

You need one of these.

To go with this.

You need one of these.

Since subs are mono you only need to use one channel of the bfd. In that case you would need one of everything. If you use two channels you will need two of everything.

Since you are in the states I would just use a ground break on the bfd.

That will stop your buzz and you can just use mono 1/4 inch plugs in and out to the bfd.

Just make sure that the bfd is always connected to a grounded unit when plugged in. Your receiver will be grounded by the power amp.

 

[highfigh]

Amp 3 prong
Tv 3 prong
Dvr sat box 3 prong
Behringer eq 3 prong
Receiver 2 prong
Dvd 2 prong

All plugged into belkin which also has 3 prongs.

Sub has 2 prongs plugged into its own wall outlet but I unpluged it from wall for now to eliminate that.

Can you post the brand and model numbers for your system? Your comments about the equalizer connections for the sub make me ask this.

 

[moreira85]

That makes much more sense thank you. Using the Cheater plug won't put my kids at shock risk? Does the receiver get grounded from the rca's connected to the amp and bfd grounded through the sub cable from receiver?

 

[moreira85]

Can you post the brand and model numbers for your system? Your comments about the equalizer connections for the sub make me ask this.

Amp- emotiva lpa-1
Sub- svs pb12 plus 2
Eq- behringer dsp 1124
Receiver- yamaha rxv 667
Dish receiver- VIP 722
Dvd- Panasonic BD 60
Power console- belkin pure av pf31