Here are the technical details:

3-Way Car Audio Coaxial Speakers, 6.5"
The model number is TS-A1677S 
140W RMS per pair / 70W each
The peak power of each speaker is 640 watts
A smooth frequency response and an expansive soundstage are delivered by Open and Smooth
An IMPP cone reinforced with carbon and mica provides a fast response and solid bass
An optimized symmetrical motor design reproduces accurate sound
It provides a natural vocal sound with cellulose fiber midrange cones
Installation flexibility and acoustic performance are enhanced by multi-fit adaptors
SERIES A GRADE
16.5 cm (6.5") in size
The maximum music power is 320 watts
70 watts RMS
37 Hz to 24 kHz frequency response
The sensitivity is 87 dB ( 1 W / 1 m )
The impedance is 4?
48 mm mounting depth
A 144 mm cut-out is required
Included are speaker adapters and grills