25/70/100 Volt Switchable (25V taps up to 3.5 Watts; 70V taps up to 30 Watts, 100V taps up to 30 Watts); Sonic Vortex® Ported Transmission Line; 8" Fluted Injected Poly Woofer; Aluminum Dome Tweeter; 35 Hz – 24 kHz Frequency Range; 92 dB Sensitivity.