Hertz Uno 6 X 9 4-way coaxial speaker
 
The exceptional clarity you will experience in the high frequencies wth these replacement speakers is largely due to the deployment of two 25mm super tweeters. These allowed Hertz to separate some high frequencies away from upper mid frequencies offering space and openness not usually found in speakers of this class. The elliptical woofer provides warmth and bass response below what is usually experienced particularly with standard fit speakers
 
Power Handling - Peak W: 340
Power Handling - Continuous W: 85
Impedance Ohms: 4
Frequency response Hz: 45 - 22k
Sensitivity dB SPL: 94
Woofer size mm (in.): 6 x 9
Tweeter size mm (in.): 40 (1.6)
Supertweeter size mm (in.): 2 x 15 (0.6)
Woofer Voice Coil mm (in.): 25 (1)
Tweeter voice coil mm (in.): 20 (0.8)
Woofer magnet: High density flux ferrite
Tweeter magnet: Ferrite
Woofer cone: Water-repellent pressed paper
Tweeter dome: PEI
Supertweeter dome: PEI