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Built in d.i.

#42
Bredian said:
Basswave - thanks for the info. We've been chasing hum at our live gigs that don't exist when recording..... after watching the JDI video, I'm thinking its a ground loop issue.

The diagram for my GK MB115 doesn't show any transformers for the DI.

Sound guy occasionally provides an old DI box, but I suspect its less than needed. My active bass often overloads the input to the PA.

Hmm.

Keep talking, I'm listening.
Click to expand...

Hi Bredian
Glad You found it informative.

To be honest, Agedhorse knows a lot more then me from an engineering perspective. He know his stuff.

On the flip side

All I can say I cannot remember a time when the ground loop function DID NOT resolve an issue with hum, based on my personal experience.
 
#43
pickles said:
I a/b every DI I had on hand at one point, and found huge differences. Sansamp w/effect bypassed, sadowsky pedal, Eden nav, lots of others. There were huge differences. I think a listening test would be a good idea when you select a DI IF you are playing somewhere with a good hi fi PA and a good room sound. If not, it doesn't matter at all.
Click to expand...

Hi D
Hope the surf is treating you well.

Good point, IME I noticed some real differences when going back in forth with different DIs in some of the theaters I play.

Some clearer then others some with tonal differences ect...I have not found a clearer DI then the JDV (what you put in is what you get type of thing). The JDI for me is the safe backup but like its box-ish (I mean that in a good way) type of tone as well.
I plug directly into a JDI-> board for practice in the home studio every time, instead of amp.
 
#44
I used a cheap DI (like $30) at church yetserday morning and it was OK. I used a Radial JDI at a gig last night - both were IEM gigs - and the Radial made a HUGE difference. We also used a better board so that may have helped as well, but man, there is a difference - especially with IEM.

I may have decided on a DI. That was also with my passive jazz. I guess a passive DI can work just fine with a passive DI.
 
#46
I couldn't find the manual but it looks like there is no ground lift switch on your amp. This means that you would need to lift pin 1 externally or it may also be the case where pin 1 is lifted at the amp and you need the connection for quietest operation. I suggest that you contact the manufacturer for advice specific to your amp.

Have you ruled out other possibilities such as a bad snake line, miswired cable etc? Also, if you can easily overdrive the mixer, I would spend some time sorting out your gain structure problems as that might be a potential cause too.

Bredian said:
So.... the other ways to resolve the ground loop?


Yes, we've tried adapters.

Short of a mic on the cabinet.
Click to expand...
 
#47
I've always used my amp DIs, and never had a problem or bad experience with them.

SWR Redhead
SWR SM-400
GB Shuttle 6.0
Aguilar TH350

The last two amps are so lightweight and portable, I can't imagine ever not bringing them to a gig or recording situation. Especially the TH350 - I mean, c'mon...how much bigger is it than a DI pedal anyway, and it has far more features than any other pedal out there.
 
#48
agedhorse said:
I couldn't find the manual but it looks like there is no ground lift switch on your amp. This means that you would need to lift pin 1 externally or it may also be the case where pin 1 is lifted at the amp and you need the connection for quietest operation. I suggest that you contact the manufacturer for advice specific to your amp.
Click to expand...
I have had very good luck using a Whirlwind pin 1 lifter on the rare occasions I get an incurable ground loop between my REDDI and amp. Doesn't happen often, but it works like a charm when nothing else will.
 
#49
JimmyM said:
I have had very good luck using a Whirlwind pin 1 lifter on the rare occasions I get an incurable ground loop between my REDDI and amp. Doesn't happen often, but it works like a charm when nothing else will.
Click to expand...

If pin 1 is connected without a switch then this would be one possible solution. I do not know how his amp is configured, so I discussed some of the possibilities.

Once this kind of problem is referred to a professional (engineer or experienced tech) there are many possible solutions to consider that most folks are completely unaware of.
 

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