PowerBass S-1ZT 1" Zirconium Tweeters Using a Zirconium Element for our S-1ZT gives your music sizzle. Adding better high frequencies along with easy installation makes these tweeters a simple upgrade to any factory OEM sound system. With the proper placement, you can improve the imaging and frequency range of a dull sounding audio system to sound like you are there at a live concert. Features - • 1" Unique Rare Earth Zirconium Super Tweeter • 6dB Crossover Built In • Surface Mount • 4-ohm System Impedance Specifications - • Nominal Impedance: 4 ohm • Material: Zirconium • Sensitivity (1W / 1M): 102 dB • Mounting Depth: Surface mount • Size: 1" • Sensitivity: 102 dB • Frequency Response: 5 kHz - 25 kHz • Power Handling (RMS/Peak): 100 / 200 watts | Powerbass | | S-1ZT | 0.75" Zirconium Super Tweeters | Pair | Black/Gray | Best Buy