Have you listened to your metal on a 2.1 or 5.1 set up? If so you will be floored with the FXZ200. Visceral bass drum kicks. is all I am gonna say. You might prefer the FXZ100 for metal but the speed of the drivers are actually excellent. They are not as fast as armatures and that is where the armatures have the advantage but these using carbon drivers have excellent speed for dynamics..The subs have much control in the various types of bass notes.I would say both will be excellent for metal but these have the weightier fuller sound with big punch power for the kicks. Sounds amazing for rock n metal actually.
Listening to Prong Eternal Heat. Sounds freaking epic!
These IEMs might be too good for me xD. I would take a car system over headphones any day because of the soundstage and power. I LOVE subbass, but it needs to be done perfectly imo. These literally sound like the perfect thing for me: 3 seperate drivers, one being a sub; I just wanted to make sure the bass is fast enough. I prefer the sound of a dedicated sub which I've never heard in headphones before. I can't wait to get these.