I'm looking for a portable amp/dac that will bring out bass in some cans. I have right now the nhr-21 (IEM) that handle bass great with my iphone as the source but also have ATH-M50's as my over ears for right now until I get some better hard hitting over ears. The source will be my iPhone.

Hey guys new member , long time lurker. I got advice here from 2013 to buy Sony Xb90ex's and I loved them until my cord ripped. I got them for 100$ then and now they go for 200+. Looking for these or maybe some alternatives for bass heavy in ears. Looking foward to chatting with yall.