The ath-e40 delivers powerful bass along with balanced mid and high frequencies to convey the full emotion of the music from the stage to the street. The proprietary dual phase push-pull driver design provides improved fidelity and efficiency. Bringing the worldwide critically acclaimed sonic signature of the M-Series to an in-ear design, the Audio-Technical E-Series headphones have been designed to fully answer the needs of demanding sound professionals and musicians from the studio to the stage to the DJ booth.