The quality of Sennheiser’s latest 10mm broadband dynamic driver shines with the IE 40 PRO exhibiting a warm sound signature with lots of details and clarity. The insulation from ambient sound is impressive for the application of these IEMs, particularly when using the memory foam ear tips.
At the low-end, the bass can not only be heard but also felt and this continues all the way to the lower-mids which will definitely bring smiles to bass players, guitarists, drummers, as well as bass lovers. The presence and balance of the 3 Ds; namely depth, definition, and details has allowed me to appreciate the low-end delivered on the IE 40 PRO.
Similar to the low-end and lower-mids, the higher-mids and high-end are in harmonious coherence delivering well-defined mids and crystal-clear highs. Vocals are particularly impressive, cymbals and percussions are crisp, clear and concise. Immersing one’s self in the musicality of the IE 40 PRO, one would be able to experience a soundstage that is wider than average and well-defined in sound imaging.
Incredibly detailed and engaging, this despite the absence of a 4th D – decay which speaks volumes for the sound quality of IE 40 PRO. One could attribute the lack of decay to allow musicians and sound engineers to monitor live performances effectively, hearing every detail with phase linearity.