Rockford Fosgate T152C Coaxial Car Speaker

Pros: Very clear and clean, very loud, good sensitivity.
Cons: Much stronger mid to high range than low range.

These co-ax speakers are in the "Power" series from Rockford Fosgate. I have a total of four of these speakers installed - two in the front door panels and two in the rear deck of a 1990 VW Golf. These are being powered by a single Rockford Fosgate ...

Pros: A very good speaker
Cons: Replacing a factory speaker can be difficult.

After intensive research I ended up with the T152C speakers. These speakers are good but you must install them properly. They do not operate well in open air. They need an enclosure and Fosgate does not offer information on the cubic inches or cubic feet ...