Hi, I am the maker of the 2E1 headphones. If you have any questions please feel free to ask me.

My 2E1 (L0F & Pro Ears) headphones are the only brand of headphones for the single-sided deaf that are made with high-fidelity rated speaker drivers and my Pro Ears have internal spacing of drivers I call the "Flying Echelon" designed to make the stereo panning effect more hearable with one ear. My L1 model does not use hi-fi rated speakers but rather Panasonic made bass boosted speakers (I consider it more of my basic brand and it was the first kind of 2E1 headphone I ever made).

I also want to give an honorable mention for another maker of SSD headphones I want the SSD community to support that are called the Yuni, as well (but they use drivers that are not rated as high-fidelity).