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Author Topic: DI box issue/questions  (Read 1835 times)

Brian Peptoo

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DI box issue/questions
« on: October 23, 2007, 08:34:28 pm »

Hello - I'm new to all of this. I'll be setting up a board for my church. We will be using long (100') xlr cables, no snake.

My DI box, for the keyboard, doesn't work. I want to make sure I am doing everything right before I exchange it.

Equipment in question
 Casio Privia keyboard px-310
   Line Out (R)(L/Mono)    Standard Jacks x 2
   Output Impedance: 2.3k Ω
   Output Voltage: 1.0V (RMS) MAX
 Whirlwind  EDB1 direct box
   1/4" In and Through jacks
   XLR output
   Pad switch for connection to "hot" signal sources
   Ground Lift switch to help isolate hum and buzz
 Peavey S-14 Mixer

EDB1 >> any xlr cable >> any input = no hum

Casio >> any 1/4" patch cable I have >> EDB1 >> any xlr cable >> any input = HUM and no keyboard sound

When I "pad" down the DI box the hum goes down, no keyboard through mixer, bringing up the gain only brings back the hum and still no keyboards. ground lift makes no difference.

Does this sound like a bad DI box? I get mics, guitar through the mixer just fine. keyboard with 1/4" phono to a unbalanced input works just fine. Only when using the DI box I cant get any keyboards and only loud hum. Am I doing something wrong?

Thanks in advance!!!
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Brian Peptoo

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Re: DI box issue/questions
« Reply #1 on: October 23, 2007, 09:05:09 pm »

Just for grins I plugged the keyboard into the OUT jack on the DI box and everything works as expected. VERY weird!
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Aaron McQueen

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Re: DI box issue/questions
« Reply #2 on: October 23, 2007, 09:59:32 pm »

The IN and OUT are usually just tied together.  Sounds like the you may have a broken ground on the IN connector.  See if you can open up the box.  It may be an easy fix.
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Don Lanier

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Re: DI box issue/questions
« Reply #3 on: October 23, 2007, 11:57:18 pm »

Exchange the DI box and save the next guy the hassle, I would look for a DI box that has a ground lift and adjustable pad switch as well, possibly a Active DI but then youll need phantom power to power the DI, Passive should work fine, since the Keyboard should have sufficient level to drive the line without a problem.
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Don Lanier
Pearl Productions
http://www.pearlproaudio.com

Andy Peters

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Re: DI box issue/questions
« Reply #4 on: October 24, 2007, 12:03:16 am »

Don Lanier wrote on Tue, 23 October 2007 20:57

Exchange the DI box and save the next guy the hassle, I would look for a DI box that has a ground lift and adjustable pad switch as well


Um, re-read his post ... he said the EWI box has both a pad and a ground lift.

-a
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Brian Peptoo

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Re: DI box issue/questions
« Reply #5 on: October 24, 2007, 08:20:04 am »

Thanks all - I have asked my local supplier, whom I got the DI box from, to ready an exchange and to test the box before I pick it up. If I get another bum box I will be really pressed for time getting everything set up for our first production run. Maybe I'll pick up an extra DI box as a spare.

I do have phantom power from the board (Peavey S14) but my understanding is that a passive DI will be justfine for this application. It does have gnd lif and pad.

Thanks for all the replies!
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Aaron McQueen

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Re: DI box issue/questions
« Reply #6 on: October 24, 2007, 09:44:49 am »

Quote:

Um, re-read his post ... he said the EWI box has both a pad and a ground lift.


Actually he said he has a Whirlwind EDB1, not an EWI.  But you're correct about the ground lift and pad.

Quote:

Maybe I'll pick up an extra DI box as a spare.


It's always a good idea to have a spare DI box.
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Faith comes by hearing, and hearing by the word of God - Romans 10:17 NKJV

Tom Young

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Use your real, full name when posting
« Reply #7 on: October 25, 2007, 10:32:26 pm »

Edit your profile so that your real, full name is displayed when you post.

Thanks
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Tom Young, Church Sound section moderator
Electroacoustic Design Services
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Tel: 203.888.6217
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Don Lanier

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Re: DI box issue/questions
« Reply #8 on: October 25, 2007, 11:34:59 pm »

You wont need Phantom with Passive DI's, thats what I get for not getting my glasses, LOL, Ive got a bunch of CBI Blue passive DI boxes there inexpensive and do a great job and there very rugged, and yes it never hurts to have spares, not having a spare for a critical piece is asking for Mr Murphy to make an appearance just when that piece of music is needed most.
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Don Lanier
Pearl Productions
http://www.pearlproaudio.com

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Re: DI box issue/questions
« Reply #8 on: October 25, 2007, 11:34:59 pm »


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