Hi Jon, was hoping to get you’re input on what I’m trying to set up. I’m trying to power my km 84 pair while running trs line level into my zoom f4. Wondering which inline device would be the right choice for me to go about this? I would also like to be able to use my existing rca>trs cable from my box series set up if possible. Thanks for any input.
The KM84s used output transformers, so if you are running them into a phantom power supply and then unbalanced into a stereo minijack input, the “unbalancing” cable needs to terminate the transformer in order for the microphone to work–you shouldn’t leave pin 3 “floating”. This could be done with an attenuator cable that is XLR-F to RCA-F or -M, but it’s not more costly to have a dual XLR-F to stereo miniplug attenuator cable. So I would recommend the latter rather than using your existing cable as an added splice. Note that connection would render the entire chain unbalanced.
An alternative is to use the GTA inline transformer with XLR-F input, that is nominally 10K:10K and thus would not attenuate, but I can supply that in 10K:500 instead, which is -14dB. That has the advantage of maintaining the signal as balanced from the microphone through the phantom power supply to the GTA, and only unbalanced from the GTA to the recorder.