hdmi buzz

[TLS Guy]

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?

Yes, it does. Your bfd and the sub will ground from your power amp.

The less grounds the better. Only one ground in the system is best.

 

[moreira85]

Okay I will try m post back. I am nervous about the Chester plug because I read on a bfd forum at the shack that it could cause shock if used.

 

[TLS Guy]

Okay I will try m post back. I am nervous about the Chester plug because I read on a bfd forum at the shack that it could cause shock if used.

It won't if you leave it connected. The screen in a good cable has lower resistance than the ground in the power cable.

 

[moreira85]

First thing I did was add the Chester plug and hum was gone. I hooked up the input into bfd. When I went to hook up the output it looks like I need another connector or a differne. Here is what happened, I plugged the xlr of of the male transformer into the output of bfd. I then took the 1/4 inch female/rca male adapter and plugged the male transformer into the 1/4 inch female connector. On the other side of the connector is a male rca. So I am stuck with a male rca that is suppose to plug into another male rca cable to connect to my sub. So it looked like I need a female rca to female rca connector or replace the connector you told me to get with a 1/4" female/rca female to allow it to connect to my sub cable.

Since I have no hum w the Cheater I assume I am still connecting the transformers to properly ground the sub and bfd?

 

[moreira85]

I had a female rca connector that brides to 2 female rcas. I tried that and cheched the aol. I the removed the bfd and ran sub cable from receiver to sub n checked spl and found i was losing about 8 to 9 spls when using the bfd w transformers. not sure if its the stereo female rca splitter I put in or as to why I am losing them.

 

[TLS Guy]

I had a female rca connector that brides to 2 female rcas. I tried that and cheched the aol. I the removed the bfd and ran sub cable from receiver to sub n checked spl and found i was losing about 8 to 9 spls when using the bfd w transformers. not sure if its the stereo female rca splitter I put in or as to why I am losing them.

I intended you to use the cheater plug and keep it connected as you had previously with the unbalanced connectors.

You have lost gian (db) as balanced connection has a different line level requirement. So the input is less sensitive. This is one of the issues of mixing pro and domestic equipment.

So the bfd was the source of the ground loop as I suspected.

 

[moreira85]

If I am getting no hum with a cheater plug why can't I just keep my origial xlr input and outputs that have rcas attached to them then ground the chasis of the bfd?

 

[TLS Guy]

If I am getting no hum with a cheater plug why can't I just keep my origial xlr input and outputs that have rcas attached to them then ground the chasis of the bfd?

Now I understand your problem. You can only make an unbalanced connection through the 1/4" phone jacks on that unit. xlr is for balanced only unless you make special floating line, but even then the impedance will not be correct.

You need use a mono !/4" jacks in and out of the bfd, you can get them with RCA female ends, and then you go RCA to RCA in and out of your bfd.

You never should have used the xlr in the first place, receiving and driving unbalanced units.

 

[moreira85]

First off this is stuff is vet confusing unless you are am EE. So you are saying I should return the xlr transformers and use the 1/4" input n output on the back of bfd with these.
http://www.newegg.com/Product/Product.aspx?Item=9SIA05W01B3451&nm_mc=OTC-Froogle3&cm_mmc=OTC-Froogle3-_-Surveillance+-+Home+Automation-_-Steren+Electronics-_-9SIA05W01B3451

 

[TLS Guy]

First off this is stuff is vet confusing unless you are am EE. So you are saying I should return the xlr transformers and use the 1/4" input n output on the back of bfd with these.
Newegg.com - Steren 251-120 Female RCA Jack to Male 1/4 Inch Mono Plug Adapter

Yes, that is what you need. The spec on that unit made no mention of it having an unbalanced input. However I downloaded the manual and the specs in the manual are more comprehensive. When you insert mono 1/4" jacks into the sockets it makes an unbalanced connection and the impedances change to optimal for unbalanced non pro gear. I suspect there is a sensing circuit, that changes the configuration of the input op amp, like on my RME unit.

It is all explained in your manual, where it tells you to make unbalanced connections with mono 1/4'" phone plugs. There is a diagram also.

 

[moreira85]

Thanks, ill try and report back. Am I still using the cheater plug or not?

 

[TLS Guy]

Thanks, ill try and report back. Am I still using the cheater plug or not?

Try it both ways and see if you need it.

 

[moreira85]

Whether I use xlr or 1/4 inch I get a light hum. If I use cheater plug with both I get no hum. I am Definetly concerned about shocking one of my kids using the cheater. Should i stick w xlr or 1/4 inch.

 

[TLS Guy]

Whether I use xlr or 1/4 inch I get a light hum. If I use cheater plug with both I get no hum. I am Definetly concerned about shocking one of my kids using the cheater. Should i stick w xlr or 1/4 inch.

Use the 1/4" and the cheater. You will not shock your kids. Your Behringer is grounded through the screens of the connecting cables via the receiver and power amp.