Sennheiser IE 900 Audiophile In-Ear HeadphonesSennheiser designed the IE 900 for uncompromising excellence in portable listening. The goal was simple: create in ear monitors that deliver exceptional sound in any environment, with the clarity and comfort trusted by professionals. A single high performance driver ensures a pure, uncolored response from 5 Hz to 48 kHz, revealing music exactly as it was intended. Acoustic Engineering X3R Absorber Technology with integrated Helmholtz resonators and