Sensitivity (dB/2.83v/1M) 86db
Impedance (nominal) 8 ohms
That's a very conservative rating. Commercial sensitivity ratings generally are made at 1 kHz, were most speaker systems have a baffle step peak or a cone-edge resonance. The Visaton is actually down a little at 1 K, so the effective sensitivity, in comparison to other commercial speakers, may be more like 88 dB. It's considerably more sensitive than the HT3, which sacrifices some sensitivity for the outstanding bass reach and clarity of the TC1 woofer.