Memphis Audio 1" Pro Audio Rear mount Tweeter MJPT25  MOJO Pro components are designed to get Loud! Memphis Audio's MJPT tweeters bring ultra-loud highs to any car audio system and are manufactured of great quality products with a sleek design. These pro audio components push the sound to excruciating levels with an RMS Power Output of 100W per Tweeter.  These MOJO Series Bullet tweeters have a 4 Ohm Impedance and sensitivity of 105dB.  When it comes to installation, you will need a mounting hole diameter of approximately 1-3/4". Once the tweeter is through the hole, you are able to tighten it down using the tightening ring.   Specifications per Tweeter: 1" Voice coil RMS Power: 100 Watts Peak Power: 200 Watts Sensitivity: 105dB Impedance- 4 Ohm  High-Efficiency Tweeter Multi-use application Rear mount design Billet phase plug Mounting Specifications: Mounting Hole Diameter: 1-3/4"  Overall Height: 2-5/8" Overall Width: 2-1/8"