Q Acoustics 2020i Bookshelf Speakers (Pair) (Graphite) Multi award-winning Q Acoustics 2020i speaker is a medium sized bookshelf design that exudes quality. The beautifully finished, low resonance cabinet encapsulates the 25mm ferro-fluid cooled tweeter and precision-engineered 125mm bass driver to produce a speaker with extended bass. Enclosure type: 2-way reflex, Bass Unit: 125mm, Treble Unit: 25mm Frequency Response (+/- 3 dB): 64Hz - 22kHz, Nominal Impedance: 6ohm, Minimum Impedance: 4.0ohm Sensitivity: 88dB, Crossover Frequency: 2.9kHz Includes: (2) Q Acoustics 2020i Bookshelf Speakers (Graphite), (2) Speaker Grills, (2) Port Bungs, (1) User Manual