Technical Details:

Four 6.5-inch 3-way car audio coaxial speakers
TS-A1677S model 
A total of 140 watts RMS per pair / 70 watts each
The peak power of the pair is 640 watts / 320 watts each
Smooth frequency response and an expansive soundstage are delivered by Open and Smooth
Bass response is fast and solid thanks to the carbon and mica reinforced IMPP cone
The symmetrical motor design reproduces sound accurately
A cellulose fiber midrange cone provides natiral vocalizations
Acoustic performance is improved with multi-fit adapters
GRADE: A Series
Size: 16.5 cm (6.5")
The maximum music power is 320 watts
70 Watts RMS
37 Hz to 24 kHz frequency response
( 1W / 1m )87 dB Sensitivity
The impedance is 4?
48 mm mounting depth
The cut-out dimensions are 144 mm x 144 mm