Yeah I know… but I figured it serves multiple purposes for me and got me excited about field recording again.

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The coresound TetraMic is a good alternative

https://www.core-sound.com/TetraMic/12.php

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What would I need to connect the digital out on my Sound Devices Mix Pre-D (AES on XLR) to the optical input on a Sony D-100 (minijack)?

I’m presuming I need an AES to optical convertor, not sure what to look for though?

there are cheap-ish AES to Toslink boxes (like this or this) that run on external 9V but it needs to carry an external battery. That plus an optical toslink-to-minitoslink cable should do.

i’ve heard people saying that they weren’t happy with tetra mic for field recording because it is pretty noisy when trying to record quiet sounds.

That’s interesting, I’ve used a sennheiser ambeo a bit and found that to be a little noisy for quiet environments. The TetraMic recordings I’ve heard were great, but noisier stuff for sure (sea, people, cities).

How is the rode noise performance?

It is quieter than the Sennheiser but not as quiet as that soundfield one that is +$2,000 more than the Rode.
It’s definitely quiet enough for my uses

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Looking at the specs, self noise is rate 17db for the Rode, 18db for the Sennheiser and 19db for the Core, but then sensitivity is 30mV for the Rode, 31mV for the Sennheiser and 7mV for the Core - so perhaps it the extra gain needed contributing to that.

I’d love to hear an A/B/C/D test on them though (with the expensive soundfield) as specs can only say so much. I think the with the Ambeo it’s the frequency pattern of the noise - quite high pitch, that makes it feel prominent, but I’d need to record some more to be sure.