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I just got mine today. I knew about the potential for this white noise issue when I purchased it, but I was really surprised at how noticeable it is. I tested this with the following headphones: Sure 215, Sennheiser HD280, Sennheiser PX 200-II, and Sony MDR-EX650AP. The hiss is most noticeable on the Sure headphones. Which surprised me because they're the most expensive and high quality ones, and everything I read talked about "cheap" headphones being the worst offenders! I am able to hear the hiss on all my headphones.

Is the resistor mod the only workaround for this? What size SMD resistors do I need? The white noise is very unwelcome and distracting. Until I find a fix, the only headphones I can use with it are the PX 200-II because they have a built in volume control. But they don't block external noise at all. So, I feel like I can only use my portable music player at home where I don't need any sound isolation (unless my neighbors are being jerks, which is an every day occurrence).

Depending on how small the resistors are I might just buy a dongle and call it a day. I don't want to break it trying to fix it.
https://www.amazon.co.uk/Extension-PCher...08T1YW1JK/

edit: I think I found the resistors. I'm going to sleep on it and consider whether the risk of damage is worth it to avoid carrying around a dongle everywhere.

https://www.amazon.co.uk/gp/aw/d/B0CGXTWLBV/

Are C15 and C6 still the right capacitors to solder the resistors to? It looks like the board layout's changed since the post about this on Crowdsupply.

https://www.crowdsupply.com/cool-tech-zo...io-quality