Question about DI's
by
breezluv32
on Monday, April 16, 2012 - 3:22pm
breezluv32
  • Contributor
Monday, April 16, 2012 - 3:22pm

Hey folks... wanted to see if someone could help me understand something... I was looking at the recent blog post "Looping 201: Multi-channel loop output with Ableton and a Presonus 1818VSL" that showed how to run 8 outs from ableton through the presonus. It shows coming out of the presonus into DI boxes, and on to the mixing board. The Presonus outputs are analog TRS Balanced. I always thought that the purpose of a DI was to covert an unbalanced signal (acoustic guitar/bass) to a balanced signal (mic/xlr). So my question is, why do you need to run through a DI box to get to the board, since the signal coming out of the presonus is already balanced? The only reason I can think of is a long cable run. I am looking into a new interface that has 6 outs (Balanced), and wondering if it is necessary to buy 6 DI's. Thanks guys!

1117
  • Ableton Trainer
  • Contributor
  • Ninja
Monday, April 16, 2012 - 11:48pm
The DI isn't necessary. You are right in thinking that the basic job of a DI is to create a balanced signal. They also go from line level to mic level and usually have the option of a ground lift if your power source isn't grounded properly. An interface is sending a very high, balanced line level. So, Balanced... check. Your board will be receiving a line level signal so it's pre amp will probably not be needed. In fact you might need a pad somewhere in the path. So, Noise being introduced in a long cable run... not a problem. (This is also solved with the balanced part.) I personally have never had a ground loop issue with an interface. With old synths or rhodes... sure. But if the interface is having problems, then the power source will be affecting a lot more than just the interface and will need to be addressed separately. All you really need is a TRS to XLR snake. Make sure you get male to male. I have one and it goes everywhere I do.
  • Staff
  • Ableton Trainer
  • Contributor
Monday, April 16, 2012 - 11:53pm

well said

Makes me wonder if I should just start travelling with a snake.

  • Ableton Trainer
  • Contributor
  • Ninja
Tuesday, April 17, 2012 - 12:01am
Yes! It's so nice. Lose the clutter and the weight. Ebay those guys and put a few bucks in your pocket... maybe for that iPad! :)
Tuesday, April 17, 2012 - 7:27am

As long as you can go straight into the Line-In jacks on your mixer, you're all set - no need for the DI's.

  • Contributor
Wednesday, April 18, 2012 - 4:29pm
Thanks guys... great info. So here would be my signal chain: Balanced 1/4 TRS-out on interface to XLR-in on the stage snake (using male TRS to Male XLR), then snake into the board (XLR to XLR-in on the board). Would that work? Our stage snake is XLR only.
  • Ableton Trainer
  • Contributor
  • Ninja
Saturday, April 21, 2012 - 3:16am
that should be fine. Like anything else you will have to set your gain structure.
  • Contributor
Monday, May 21, 2012 - 1:00pm
You guys should check out monoprice.com. I buy all my cables there, and I can't find anywhere cheaper. I'm running trs to xlr from my firestudio project into our stage snake, and it's working great.
  • Contributor
  • Exclusive Contributor
Friday, June 1, 2012 - 1:36pm
I already use 1 8x8 TRS to XLR snake for in-ear monitors. I might as well get another one for the loop rig.