Teufel Ultima 30. Recommended usage: speaker set unit, Speaker placement: Floor, Tweeter size: 25 mm. Impedance: 4 Ом, Sensitivity: 86 dB, Crossover frequency: 2500 Hz. Connectivity technology: Wired, Speaker interface type: Banana. Housing material: Wood. Width: 210 mm, Depth: 325 mm, Height: 910 mm