With a standard active DI, lets say a Countryman 85, even with the "ground lift" switch engaged, there is still a non isolated electrical connection between the high impedance side (where your bass and amp would be connected) and the low impedance side (mixing console), due to the nature of the active DI circuit needing a ground path back to the console to function. though to understand why requires a bit of electrical and grounding knowledge. What matters more is that your DI is shielded and that your cables don't suck. I've used a ProAV in a pinch for instruments. I've used one particular passive DI for acoustic guitar, keyboard, bass guitar, electric guitar direct, a drum pad, a DJ mixer, outboard audio gear, an ipad, and a whole bunch of other random stuff at all sorts of venues. passive has absolutely nothing to do with the input device. Some DIs are designed for different input signal characteristics like a ProAV or something similar that you'd use to connect an iPad to the show. You mentioned "expecting" signal characteristics in another comment. A DI is probably not your weak link unless you're picking up AM radio stations when it's connected. If you are a systems integrator needing to run a quiet audio system in a theater or studio, we can't prescribe it for you, you need to do a situational analysis of the problems you're trying to solve. I've used a pair of $50 passive DIs from Guitar Center just fine to get a 2-channel XLR connection from a rackmount CD player with RCA outputs. Sansamp) always had extra features like amp modeling or whatever. All the festivals and gigs I've worked over the years - from 20 people in a bar to 50,000 people in a field - used passive DIs (mostly Radial or Whirlwind) onstage except for the occasional musician who brought their own, and their fancy active DIs (e.g. The difference among active/passive DIs and even brand in most live audio situations is negligible and people with other opinions IN MY EXPERIENCE tend to have developed those opinions off ancient and busted gear where it DID matter.
There's always more than one way to do something and engineers will continue to use what they know for their whole career. When it is, it's most commonly because it's poorly shielded, or (getting less common outside of churches and garage bands) ancient tech from the 1970s. I sure do love a DI that can get stepped on and chucked into road cases all year but I don't always need that kind of engineering. They'll also find a way to milk you for $250 when you really just needed a lower end $100 part.
Radial is probably a good one to start with because they are champions of marketer-speak and will make you feel good about whichever one you choose. I don't know why a production company would want an active DI requiring any sort of power, since that limits your use cases, and you're probably not trucking a hundred specialized DIs to each show. Get one that doesn't suck and you're golden pretty much forever. In the absence of any other guidance, KEEP IT SIMPLE STUPID (KISS) principle applies. Isn't that what the pad is for? -PĮventually you just gotta pick one and try it. In my experience they're kind of interchangeable. I have used both kinds of DIs to plug a performer's preamp outputs into my snake, when the only output on the preamp was 1/4" or unbalanced. The only thing I can put into this category is keyboards drum machines, and DJ mixers. I would expect the outs of most any preamp to be line level.
Anything I knew wasn't going to a preamp? Isn't it like the "next step up" level-wise compared to a passive DI? I've actually never owned an active DI. So I would use a passive DI for a direct from anything that has strings and a pickup of any kind on it, electric pianos, and anything that doesn't say "line" but not something like an output from an audio interface, mixer, amp, drum machine. To me that means any kind of output that I don't think is line level, meaning anything that doesn't have a preamp, not counting active pickup systems on basses, acoustics, etc. Violin/Electric Violin/Mandolin/Banjo etcįrom what I can tell, a passive box gets a high impedance signal to a low impedance signal- basically gets it hot enough for a preamp."iPod" or other 1/8" stereo TRS and assorted dongles.Line out from a bass/guitar/keyboard amp.Electric Bass DI (active/passive pickups?).When do I use a passive DI vs an active one? Let's think of what we run into out there That's proabably because I'm stupid and none of my fellow workers have had more of a clue than I did whenever this question came up. Strangely, this did answer he OP's question as far as I am concerned.
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