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Running a signal backwards through a DI?
Old 21st January 2009
  #1
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Guitar Zero's Avatar
 
🎧 10 years
Running a signal backwards through a DI?

Can you use a Passive DI box backwards to turn a line level balanced signal into an instrument level unbalanced signal?
Old 21st January 2009
  #2
Gear Maniac
 
dr_love6977's Avatar
 
🎧 10 years
Quote:
Originally Posted by Guitar Zero ➡️
Can you use a Passive DI box backwards to turn a line level balanced signal into an instrument level unbalanced signal?
Yes. Just think of the DI as a unbalanced/balanced converter without a set direction of signal flow.
Old 21st January 2009 | Show parent
  #3
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Guitar Zero's Avatar
 
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Quote:
Originally Posted by dr_love6977 ➡️
Yes. Just think of the DI as a unbalanced/balanced converter without a set direction of signal flow.
OK, thanks much
Old 21st January 2009 | Show parent
  #4
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Rick Sutton's Avatar
 
🎧 15 years
Don't think a standard DI box will change the level as much as you describe.
Balanced to unbalanced, yes.
Line level to inst level. Don't think so.
Solution is to attenuate the line level before sending it to the DI.
Old 21st January 2009 | Show parent
  #5
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Empire Prod's Avatar
 
🎧 15 years
A DI is not a REAMP if that is what you mean
Old 21st January 2009 | Show parent
  #6
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liquidtension47's Avatar
 
🎧 10 years
some passive DIs, like the radial JDI, work backwards for re-amping. not the best solution, but it works.
Old 22nd January 2009 | Show parent
  #7
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Mike Brown's Avatar
 
🎧 10 years
Quote:
Originally Posted by Empire Prod ➡️
A DI is not a REAMP if that is what you mean
Quote:
Originally Posted by liquidtension47 ➡️
some passive DIs, like the radial JDI, work backwards for re-amping. not the best solution, but it works.
It works very well infact if you attenuate the signal.
Old 22nd January 2009 | Show parent
  #8
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lanyee's Avatar
 
🎧 10 years
Quote:
Originally Posted by Mayor999 ➡️
It works very well infact if you attenuate the signal.
How do you attenuate the signal?
Old 22nd January 2009 | Show parent
  #9
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Mike Brown's Avatar
 
🎧 10 years
Quote:
Originally Posted by lanyee ➡️
How do you attenuate the signal?

?


Any way you want.

Use a fader on a console.

Turn down the fader coming out of your DAW.

Use the output control on a compressor (with compression or without).

in-line pad.

etc etc etc
Old 22nd January 2009 | Show parent
  #10
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lanyee's Avatar
 
🎧 10 years
Thanks. So is there a built in attenuator in a proper reamping box?
Old 22nd January 2009 | Show parent
  #11
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dubrichie's Avatar
 
1 Review written
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well most of them have a level knob which, i suppose is a variable resistive potentiometer, which is indeed a variable attenuator.
Old 22nd January 2009 | Show parent
  #12
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Mike Brown's Avatar
 
🎧 10 years
Quote:
Originally Posted by lanyee ➡️
Thanks. So is there a built in attenuator in a proper reamping box?
Usually.
Old 22nd January 2009 | Show parent
  #13
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Doc Mixwell's Avatar
 
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🎧 10 years
Quote:
Originally Posted by lanyee ➡️
Thanks. So is there a built in attenuator in a proper reamping box?
There is a signal trim on the Little Labs RED-EYE!! If you need to re-amp a line level source, or use a DI, than something like the Little Labs RED-EYE passive DI/REamp is your best friend. If you need to attenuate passively, [which you won't with the right re-amp box] The Little Labs RED-CLOUD, 8 channel attenuator pack is a life saver for more applications then you might think.
Old 22nd January 2009 | Show parent
  #14
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KUTCH 1's Avatar
 
🎧 15 years
I used to use an older version of this DI at my home studio:

Applied Research & Technology: ARTcessories™

which has a built in attenuator (-20 or -40)

might not be ideal but it worked for re-amping and was convenient
Old 22nd January 2009 | Show parent
  #15
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UPRYZ's Avatar
 
🎧 15 years
so let me get this straight: I could, for example, take a D/A out (attenuated in PT), send it in to the xlr output jack on the passive DI (using a female to female XLR barrel adapter) and connect the DI to gtr amp with TS cable and reamp till the cows come home?

I know the dedicated reamp boxes have more bells and whistles - but this would do the trick with no adverse effects?

oooohh.
Old 22nd January 2009 | Show parent
  #16
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kooz's Avatar
 
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@ UPRYZ

yup, trim the signal using the trim plug so that it averages whatever your cal'd for in ref to 0 dB VU and assign it to squirt out a DA channel, pull the channel fader 20 dB and you'll be in the ballpark to send signal down your described chain
Old 22nd January 2009 | Show parent
  #17
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Guitar Zero's Avatar
 
🎧 10 years
Quote:
Originally Posted by Mayor999 ➡️
It works very well infact if you attenuate the signal.
Any guidelines on what kind of dbfs level you want showing up to your D/A converters for this to work well?
Old 22nd January 2009 | Show parent
  #18
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pootkao's Avatar
 
🎧 10 years
I use my Radial DI in reverse for re-amping all the time. It works just fine. Its got a -18 dB pad if needed, or better yet, just pull down the fader on the console or in ProTools.
Old 22nd January 2009 | Show parent
  #19
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Guitar Zero's Avatar
 
🎧 10 years
OK, thanks for all the replies, this is very helpful.
Old 22nd January 2009 | Show parent
  #20
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Mike Brown's Avatar
 
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Quote:
Originally Posted by Guitar Zero ➡️
Any guidelines on what kind of dbfs level you want showing up to your D/A converters for this to work well?

-30 to -40 maybe?


Usually 20-30 dB of attenuation from where its recorded at line level.

Although some transformer saturation may be desirable... use your ears.
Old 23rd January 2009 | Show parent
  #21
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Guitar Zero's Avatar
 
🎧 10 years
Just tried it out yesterday, and it worked beautifully. You were right, usually around 30 dB attenuation give or take 10 dB was perfect. Very fun experimenting with all the possibilities.
Old 23rd January 2009 | Show parent
  #22
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theblotted's Avatar
 
🎧 15 years
i do this to route guitar pedals back into PT all the time.

DA - Radial JDI Duplex (one side, backwards) - pedal of choice - Radial JDI Duplex (other side, right direction) - AD


usually no attenuation, and esp NO high pass (sounds terrible).
Old 15th February 2013
  #23
Here for the gear
 
1 Review written
🎧 5 years
Sorry to wake this old post up, my question is I want to take 4 guitars a longer than 20' distance to isolation booths that the amps will be in, can I go from guitar to DI box to XLR 40 or so feet and then go into the XLR output of another DI box and out of the 1/4" to the amp inputs or do I have to get totally different types of re-amp boxes to accomplish this.
Just for info, we have a couple Radial DI boxes, but mostly either EWI or whirlwind.
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