Wow you are the one who designed these magic. I love them so much! Thank you for the amazing products.If using Zen Can with the original SMPS or even ipower X (or normal iPower) output power into low impedances is limited, especially if using balanced output. This is also documented in Amir's measurements.
This should not affect 300 Ohm or higher impedance Headphones.
But with (say) 50 Ohm Planar Headphones like the Fostex T50 (BMF Mod + some extra) I use, it is possible to exceed the undersized power supplies current limit causing clipping and dropouts.
I commented on that and discussed options here and showed my own solution:
https://www.head-fi.org/threads/sup...ucts-and-possibly-other-manufacturers.966163/
In the "Supercharged" version I find I can drive rather difficult to drive high end Planars well. Seems insane driving a 4,500 USD Headphone with a 500 USD DAC/AMP stack that was a little supercharged. But it works surprisingly well. Using a stock iPower instead, less so.
Thor
Also thank you for sharing the thread to fix the power issue. It was packed with much info so I will have to go through it slowly.