[sdiy] OT: line level shifter?

[Michael Ruberto]

Soon I will be picking up my new mixer. Problem here is that I just found 
out all of it's inputs are unbalanced +4 level. So I have to find or 
preferably build a level shifter that can accomodate the 20+ outputs of all 
my -10 output synths and sampler. I imagine buying something to do this will 
cost a hefty sum for this many channels. Can I just build these from 
standard op-amps?
Is there aything more significant going on here besides just a fixed gain 
cell?

Also I am curious about Active Direct Inject boxes. Anybody use them? Are 
they better/worse than passive?

M. A. Ruberto

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