| Unbalanced to Balanced to Unbalanced Line? [message #318224] |
Wed, 30 April 2008 21:58  |
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 Dan Brandesky
Messages: 683
Registered: February 2006
Location: Lima, OH |
Has No Life |
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I have a sort of odd situation here.
I want to set up a preexisting audio snake for an installed mixing console so that I can feed some in-ceiling monitor speakers from an aux on the board. So basically I would have, say, send "C" on the snake, which leads via the ELCO connector to the main rack, and from the main rack that send would be connected to the "long" line that goes to the in-ceiling speakers, >100' away.
The problem is, the mixer only has unbalanced auxes for some dumb reason, and the speaker amp will be at the other end of the "long" line, and also only has unbalanced inputs. I know I need a balanced line along the long run to keep out interference, but I'm not sure how I should do it. I was thinking of installing a direct box or something in the main rack, so basically the unbalanced signal coming from the multipin breakout in the rack would be connected to the direct box, which would be connected to the long cable run, but even then, should I just leave the shield unconnected at the other end? I'm not too worried about the unbalanced out of the mixer, not much I can do about that anyway, and the hum pickup along that run isn't so bad (tolerable at least for this application).
Anyway, how would you go about this?
Thanks,
Dan
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| Re: Unbalanced to Balanced to Unbalanced Line? [message #318414 is a reply to message #318224 ] |
Thu, 01 May 2008 12:33  |
Don Boone
Messages: 405
Registered: April 2004
Location: SE USA |
Has No Life |
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Transformers on each end. I use Edcor for lo/mid-fi applications and Jensen for critical applications.
Don
http://www.edcorusa.com/
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| Re: Unbalanced to Balanced to Unbalanced Line? [message #318583 is a reply to message #318224 ] |
Thu, 01 May 2008 19:57 |
Charlie Zureki
Messages: 266
Registered: April 2008
Location: Detroit Area |
Has No Life |
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Dan,
Is this for a permanent install? Or a couple of shows?
Your "C" output(RCA) insert RCA male/1/4" female adapter, then 1/4" male to 1/4" male (guitar cable 2'long) into direct box, from DI XLR into snake (Console side)
Snake (rack side at stage?) XLR all the way to Ceiling speaker mixer then into another DI, Plug 1/4" male to 1/4" male (guitar cable 2' long) into adapter 1/4" female to RCA male.
You'll Need:
2 DI's
2 RCA males to 1/4" Females
2 Guitar Cables (as short as possible)
2 XLR cables: 1 10' long
1 long enough to go from rack to ceiling mixer
The DI's have a transformer in them
If this is for a permanent install, I'd go Don's route and use jensen transformers permnently mounted somewhere
Good Luck
Hammer
Be prepared, you'll need it!
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| Re: Unbalanced to Balanced to Unbalanced Line? [message #319222 is a reply to message #319167 ] |
Sat, 03 May 2008 21:28 |
Charlie Zureki
Messages: 266
Registered: April 2008
Location: Detroit Area |
Has No Life |
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Dan,
Because your Aux has Unbalanced Outputs.
You NEED TWO Transformers to do what you want to do!
The First transformer takes the Unbalanced signal and creates an inverted copy of the signal and sends the two signals through the snake as a Balanced signal. The second transformer at the other end adds the two signals together rejecting any noise introduced along the path and once again creates an Unbalanced signal to be input into the ceiling speaker amp.
Good Luck
Hammer
Be prepared, you'll need it!
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| Re: Unbalanced to Balanced to Unbalanced Line? [message #321943 is a reply to message #321904 ] |
Mon, 12 May 2008 08:26 |
Al Clayton
Messages: 38
Registered: July 2006
Location: Rochester, N.Y. |
Should Get Out More |
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| Tim Padrick wrote on Mon, 12 May 2008 00:35 |
See Jensen Transformers paper AN-003 "Interconnection of balanced and unbalanced equipment" by Bill Whitlock.
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A Must read! Here is a link:
http://www.jensen-transformers.com/an/an003.pdf
Beer is proof that God Loves us and wants us to be happy. - Ben Franklin
Horray Beer!
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| Re: Unbalanced to Balanced to Unbalanced Line? [message #322966 is a reply to message #321943 ] |
Wed, 14 May 2008 22:17 |
Charlie Zureki
Messages: 266
Registered: April 2008
Location: Detroit Area |
Has No Life |
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Gentlemen, please read Dan's original post.
He has an Unbalanced Output (Mixer Aux), he needs to run a distance of approx. 100 ft.(Balanced), then he needs to go to his Unbalanced input on the Amp.
Cheers,
Hammer
Be prepared, you'll need it!
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