25/70/100 Volt Switchable (25V taps up to 1.8 Watts, 70V taps up to 15 Watts, 100V taps up to 15 Watts); Sonic Vortex® Ported Transmission Line; 4" Fluted Injection Poly Woofer; Aluminum Dome Tweeter; 68 Hz – 24 kHz Frequency Range; 89 dB Sensitivity.