Used Sennheiser IE 400 PRO Professional In-Ear Monitoring Headphones, Smoky Black

The in-ear monitoring sound of the IE 400 PRO delivers a noticeable punch, clear high frequencies and transparent mid-range reproduction. Even at a high sound pressure levels, the IE 400 PRO's warm sound is free from artifacts and distortion.

With the newly developed TrueResponse technology, the dynamic driver measuring a mere 7mm generates tremendous resolution and prevents acoustic stress, even during long periods of use. Distortion, overlapping frequencies and feedback peaks which otherwise occur frequently are no longer a problem. The distortion factor has been optimized to a previously unimaginable 0.08%.

The ultra-compact design can be adjusted to fit the individual thanks to the accompanying silicone and memory foam adapters. Easy to handle and robust, the IE 400 PRO reproduces a brilliant sound under extreme stress, and a secure and comfortable fit allows for use hours on end.

Reinventing the Single Dynamic Driver Principle
The IE 400 PRO feature Sennheiser's newly designed single dynamic driver for in-ear monitoring, changing the landscape for musicians, sound engineers and DJs. Our new TrueResponse technology utilizes a single driver to deliver the entire frequency range with no cross-over effects or phase issues, which can be introduced with multiple driver/balanced armature designs. With TrueResponse, sound stays distortion-free, eliminating acoustical stress for professionals.

Imaging remains natural and differentiated, even at highest sound pressure levels and has real punch, even in the loudest surroundings. These new in-ear monitor headphones offer a simple promise: "More me" - improving the way you perform by enhancing the way you hear.

The advantages of Sennheiser's TrueResponse technology at a glance:
• One extra-wideband transducer covering the entire frequency range
• Phase linearity - phase differences are non-existent
• Truly distortion free with only < 0,06 % total harmonic distortion
• Free of cross-over effects
• A natural and differentiated signal provides a precise sound image
• True punch - audible in demanding environments
• Able to withstand higher sound pressure levels
• Ultra-lightweight and compact design of the ear mold