What is the opinion of Reddit about the
Portable Headphone amp 3.5mm Stereo Audio Out, Powered by Lithium Battery, Support GAIN, Headphone Amplifier for iPhone, iPod, iPad，MP3，MP4 and Computers?

I don’t see why there would be quality loss using the controller jack, there’s plenty of bandwidth there. TV through the amp seems like it definitely won’t work with 3D audio. Which DT770s do you have? I’d bet the 32 ohms would work fine through the controller, 80 ohm should be okay. The 250 ohm might be a little much, but a cheapo inline battery powered headphone amp like this would do the trick. I use a similar setup for my electrostatic headphones when I’m traveling, it works well.

Accessories Used

DAS (obviously)

Portable Headphone amp 3.5mm Stereo Audio

https://www.amazon.com/dp/B0895SGCGQ/ref=cm_sw_r_cp_api_glt_fabc_DJ555N5VMGAPMPD1Y0MD?_encoding=UTF8&psc=1

UGREEN USB C Cable 90 Degree Right Angle USB A to Type C

https://www.amazon.com/dp/B07VJNQT6F/ref=cm_sw_r_cp_api_glt_fabc_CZ9HB5W190K955VEA91G?_encoding=UTF8&psc=1

AMVR Resilient VR Facial Vent Soft Interface Bracket

https://www.amazon.com/dp/B08ZMYF69S/ref=cm_sw_r_cp_api_glt_fabc_KR6VFK7HD3TDDSWBESWR?_encoding=UTF8&psc=1

INIU Portable Charger

https://www.amazon.com/dp/B07CZDXDG8/ref=cm_sw_r_cp_api_glt_fabc_8ZCH7C443P590XMXT596?_encoding=UTF8&psc=1

Valve Knob

https://etsy.me/2SqrKmt

DAS Adapter

https://etsy.me/2HBL9s0