KEF XQ20STBL Floor Stand for XQ20 Speaker (Black) - Pair (Discontinued by Manufacturer) Three way bass reflex design Drive units: 6.5 in. Uni-Q with 0.75 in, aluminum dome HF, 0.75 titanium dome Hypertweeter Frequency response: at 3 dB 60 Hz - 55 kHz Sensitivity: 89 dB Dimensions (H x W x D): [including grilles and hypertweeter] 14.7[16.4] x 9 x 11.9[12.1] in.