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Adding a pre/post DI switch to a LMII

zenrad

zenrad

Supporting Member
Feb 4, 2009
1,075
1,001
Bergen County, NJ
#1
I had my LMII open the other day to move the jumper on the PCB that controls whether the DI out is pre or post EQ. I noticed that there's a small plate covering a hole on the back of the chassis that's held on by two screws. That hole seems like it would be a prefect location to place an SPST switch that would do the job of the jumper. Has anyone done this? It seems like it would work without problems, but I could be wrong.
 
#4
BassmanPaul said:
As a serious question - just how many times do you open up your amp to change the DI settings????

Paul
Click to expand...

So far twice. For the amp's first live gig I had switched it to pre EQ, in my home studio I like to go post EQ.

They added the switch to the LMIII, and there's a hole in the back just waiting for it. Many heads have the option. Even if I don't use it often, for the small amount of effort and 15 minutes of my time it would take to pop a pushbutton switch in there it would be worth it.
 
#7
zenrad said:
So far twice. For the amp's first live gig I had switched it to pre EQ, in my home studio I like to go post EQ.

They added the switch to the LMIII, and there's a hole in the back just waiting for it. Many heads have the option. Even if I don't use it often, for the small amount of effort and 15 minutes of my time it would take to pop a pushbutton switch in there it would be worth it.
Click to expand...

Im only suggesting this because I just posted the same thing in another thread...... why not keep your amp at post eq, and then if you have a gig and need it pre eq, why not plug into a simple rolls db25 before going into your amp? They cost 25 bucks or something like that.

For warranty purposes, I could justify spending 25 bucks to keep it intact and that way you have post eq on your amp and then a portable pre-eq box that you can plug into when needed.
 
#9
I've been thinking about this, too.

I have a Precision that I play with the EQ flat, but my Jazz requires a bit of EQ'ing, which often is not the sound the soundman prefers. I would love to be able to switch from PRE EQ to post with a switch. . .
 
#10
If I can get the little cover off of that extra hole I'll do it. Out of curiosity last night I removed the two little screws on the cover but it didn't come off - I'll have to open it up and take a closer look. If I have to drill a small hole, well, it wouldn't be the first time I drilled holes in an amp chassis for a switch. At this point it's just a matter of getting the little spade connector and deciding whether to use shielded wire or not. I'll take photos for the curious if I do it.
 

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