ALPINE SPS-510
Type S 5-1/4" 2-way car speakers
GENERAL FEATURES: 
5-1/4" 2-way speakers (pair)
mineral-fortified polypropylene woofer cone with rubber surround
3/4" silk dome tweeter
power range: 2-55 watts RMS (170 watts peak power)
frequency response: 80-22,000 Hz
sensitivity: 87 dB
top-mount depth: 2"
grilles not included
warranty: 1 year
 
Top-tier sound
The specialists at Alpine optimize their SPS-510 5-1/4" speakers for great range and impressive tone definition, even at low power levels. You can connect these versatile Type-S Series speakers to your factory stereo for an immediate sonic improvement, or hook them up to a powerful aftermarket stereo or amp for increased performance.
 
Mineral-fortified polypropylene cones are exceptionally stiff, yet lightweight, which means they can push out accurate upper bass and deliver clear midrange. Resilient rubber surrounds help keep the woofer centered for accurate cone movement, reducing distortion. Silk dome tweeters provide warm high notes that bring out the character of the instruments and vocals.
 
Grilles are not included; the factory grilles should be suitable for most applications.