Rockford Fosgate built their name on power and they not only know how to create massive amounts of it, but how to channel that power into a truly transcending musical experience. The Power Series of speakers from Rockford Fosgate combine innovative materials and are hand built to ensure quality.
Rockford uses parabolic aluminum cones in their midwoofers to create a ridged yet light cone which delivers hard hitting midbass all while not adding any color to the music that was not intended. The cone is attached with a foam surround to a die-cast concealed ring for mounting. All of this is held in place by a proprietary cast aluminum basket. The structure of the midwoofer combined with the other material used allows Rockford to deliver an excellent sounding product that is durable as well.
To properly protect and separate the sound from the midwoofer and the tweeter Rockford uses a 24dB per octave crossover network that is contained in attractive aluminum housing. The tweeter is an inverted titanium dome tweeter.
I put these speakers in my number four position because they combine rugged looks and performance from the durability standpoint, with good musical performance because the proper mix of good design and materials.