Audio Technica ATH E-40 - My first impression of these IEMs is good. They have a balanced sound. The bass is tight not too much not too little. I'd say it's in
Audio-Technica ATH-E40 Professional In-Ear Monitor Headphone - Reviews | Headphone Reviews and Discussion - Head-Fi.org
Audio-Technica ATH-E40 Professional In-Ear Monitor Headphones — Rock and Soul DJ Equipment and Records