Does this fit in a 2001 Honda Civic and does it have a amplifier

No amplifier with speaker, they come singular. Also, in order for the speaker to fit it needs extra space.

whats the difference between classic, sealed and bullet?

There are very slight differences between the three, but the classic cone has more of a midbass sound, the bullet may play in the same frequencies as the classic, but since it has the hole in the middle you might actually hear at a bit of a higher pitch, and the sealed back has the benefit of not needing an enclosure to be able to play midbass notes as the back part of it is closed off.

ASIN	B0766CHN7C
Batteries Required	No
Color	New Model
Compatible Devices	Laptop, PC, Smartphone, Tablet, Television
Control Method	Touch
Customer Reviews	4.5 4.5 out of 5 stars (1,735)
Date First Available	October 26, 2017
Impedance	8 Ohms
Included Components	Manual, Speaker
Is Waterproof	True
Item Model Number	PRO-GM6B
Item Shape	Rectangle prism
Item Weight	1.81 kg
Item model number	PRO-GM6B
Manufacturer	DS18Sound (Automotive Dummy vendor code for NIS)
Material	Steel, Paper, Cloth
Model Name	PRO-GM6B
Mounting Type	Tabletop Mount
Number of Items	1
Output Wattage	140 Watts
Power Source	Corded Electric
Product Dimensions	6.4D x 16.5W x 16.5H cm
Recommended Uses For Product	car
Size	6.5-Inch 8-Ohms
Speaker Count	1
Speaker Size	6.5 Inches
Speaker Type	Woofer
Special Feature	Durability, High Frequency
Subwoofer Diameter	6.5 Inches
Surround Sound Channel Configuration	1.0
Unit Count	1.0 Count
Wattage	480 W
Wireless Communication Technology	Bluetooth

DS18 PRO-GM6B 6.5" 480w Watt 8 Ohm Bass Loudspeaker Car Midrange Speaker

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