World-class mic preamp The iD4 MKII brings one of Audient’s discrete Class A console mic preamps — the very same found in its ASP8024-HE recording consoles — to your home studio. And trust Sweetwater when we say that this thing sounds killer. Audient uses the same Class A mic preamp design throughout their product range, so whether you’re in the studio working on an Audient board or on the road with your iD4 MKII, you can count on world-class Audient sonics.