I will just say this now..
A 3.5mm Y-Adapter IS NOT the same thing as a 3.5mm headset adapter. They look almost the same, but they do completely different things.
A 3.5mm Y-Adapter simply allows you to plug two pairs of headphones in to 1 ipod for example..
A 3.5mm Headset Adapter allows you to connect a mic and headphones in to the DS4 for example..
YES, with a headset adapter, you can connect any headphone and any mic you want to the DS4 and it will work. Same thing with the Mixamp, you will need 3.5mm headset adapter, NOT a standard 3.5mm Y-Adapter.
Just wanted to make that clear.
That being said, even though a 3.5mm headset adapter will allow you to plug any headphone/mic combo you like into the DS4, the overall quality is horrible, so I dont recommend it.