MTX's Road Thunder Extreme speakers, which use PA system technology to bring concert sound levels to your car. If it's time to take your highs to the next level, MTX designed the RTX4BT 4" tweeter with the same compression-horn design found in most concert PA systems, so it'll play at high volumes for extended periods without breaking a sweat. And thanks to its aluminum cone and titanium diaphragm, this incredibly rugged tweeter can handle up to 200 watts RMS. Its 8-ohm impedance means you can wire up two to a single amplifier channel for maximum high-frequency intensity.

Note: This package contains one tweeter. You'll need an external amplifier to drive this tweeter properly — an in-dash stereo won't have enough power.

• 4" aluminum bullet tweeter with compression horn design
• power range: 50-200 watts RMS (750 watts peak power)
• frequency response: 2,700-22,300 Hz
• sensitivity: 97 dB
• top-mount depth: 2-1/10"

What's in the box: