Acoustune HS1551 CU sound relatively balanced. Still rather bassy but in a good and musical way. Bass is strong and punchy, mids is smooth and warm, treble is super smooth, good clarity with decent extension, but treble level is a bit under the bass and mids. Dynamic is really good, a lots of oomph and realistic dynamic.
Transducer :Φ10mm Single Dynamic DriverImpedance :32Ω