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I try to use my Rode SmartLav+ with Scarlett 2i2 USB pre-amp. I already bought Rode SC3 adaptor and small jack to big jack adaptor. I try to use any of the line/instrument inputs on my pre-amp, but it doesn't work. Of course when I plug Rode SmartLav+ to my smartphone or laptop it works. From the other hand, when I plug my Beyerdynamic set with Scarlett pre-amp it also works. I've also checked small jack to big jack adaptor and it works with eg. headset. How do you think - what can be a problem?

Below I provide images for my configuration. When mic is plugged-in to pre-amp the o'ring of the gain potentiometer is not even "turned-on" (it has diode indicator which cause it to shine green, yellow or red depending on the mic sound input).

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Your problem is likely related to the connectors. The microphone has a TRRS connector and your adapter is only TRS.

TRRS is commonly used in smartphones to allow stereo output and a mono microphone input to connect to the same jack. Standard audio interfaces do not expect to connect this way.

You will need a 1/8" TRRS to 1/4" TRS adapter to make this work (or maybe something like this in addition to your correct adapter)

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The input signal might be too weak for the 2i2. Since this is a condensor mic, you should activate the 48V phantom power switch and try again; this may be required to power the active electronics in this specific mic.

You could also try actually recording in your DAW, even if the indicator doesn't light up.

  • Your wording is a bit confusing (in a dangerous way). Phantom Power does not directly boost signal level and using it on a mic that isn't built to receive it is generally a bad idea. – user9881 Feb 6 '17 at 22:02
  • Well... Correct me if i'm wrong but doesn't a condenser mic need phantom power in order to work? – vinteger Feb 6 '17 at 22:47
  • They do indeed! I think it's important not to conflate +48v with a signal boost. – user9881 Feb 6 '17 at 22:50
  • Then i must have misinterpreted the behavior of my NT1-A connected to my 2i4 via XLR. The signal appears to be significantly stronger when phantom power is activated. – vinteger Feb 6 '17 at 23:30
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    @vinteger - yes, it appears to get louder due to the active electronics in the mic actually having power. Condenser mics work by inductance between two plates that vibrate relative to each other. Just vibrating does produce a small amount of electricity that may be able to make it to the wire when the electronics are unpowered, but providing phantom power will allow the electronics to work properly and provide a boost (and possibly other processing) to the signal before it is sent on its way. The +48v isn't the direct cause though, it's just providing power to the stuff that does the boost. – AJ Henderson Feb 7 '17 at 16:40
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I've found an answer to my question. RODE SmartLav+ is a plug-in powered microphone, thus it needs around 5V powering. That's why it works with smartphones, laptops, and most cameras, and do not work with Scarlett 2i2 pre-amp which has only 48V phantom powering. The solution to my problem is an external power supply for the mic, which can be something like this. Anyway, thanks for the answers.

  • The "-1 giver" can you argue your downvote? – bluevoxel Feb 7 '17 at 3:19
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    Would you mind trying vinteger's answer? It might save you the trouble of an external battery. – user9881 Feb 7 '17 at 16:15
  • @AJ Henderson I've tried to use phantom power with this mic with appropriate adaptor (Rode SC3) and TRRS to TRS adaptor. The Answer of DoritoStyle indicates that he/she didnt't read my question at all, where I've written, that I have mentioned adaptors he/she recommended. You shouldn't even try to use phantom power with plug-in powered 5V microphones. From the other hand, my solution works and is compatible with theory standing behind it I've described. Downvotes are unjustified. – bluevoxel Feb 8 '17 at 0:11
  • @bluevoxel - I was not immediately familiar with the function of the particular adapter cable and looking around about the mic in question mentioned issues with the pinout. Looking in more detail, I see you tried this and the phantom power I found people saying worked was using a +12 instead of a +48, but your original question wasn't as clear as your explanation here. Either way, it doesn't matter if votes are justified or not, they are based on what people think of the value of the answer. Providing further support for the answer or more explanation may help. – AJ Henderson Feb 8 '17 at 0:23
  • It's also worth pointing out that the adapter you linked only provides 1.5v, not 2.7v, so it's only providing half the power the mic should have. – AJ Henderson Feb 8 '17 at 0:25

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