64 Audio U18t, Audiophile reference in-ear monitor@+With 18 drivers and a completely tubeless design In the compact housing of the U18t, 8 balanced armature woofers and 8 BA mid-range speakers work together with a BA mid-range tweeter and the tia BA tweeter. The result is a lively deep bass, transparent mids, impressive treble expansion as well as pronounced depth graduation and an extended sound stage. The modular Apex technology reduces the air pressure in the ear canal and ensures a fatigue-free sound experience., Closed construction, Frequency range: 10 - 20,000 Hz, Sensitivity: 111 dB / mW @ 1,000 Hz, Impedance: 10 ohms @ 1,000 Hz, Crossover: integrated 4-way passive crossover, Isolation: -20 dB and -15 dB thanks to the included apex modules, Cable: 1.2 m (detachable), Connection: 3.5 mm mini jack, angled, Scope of delivery: transport hard case, TrueFidelity foam eartips (S, M, L), silicone eartips (S, M, L), m20 apex module, m15 apex module