Here are some of the features of the Pyramid 6991:
Standard 6'' x 9'' Size Fits OEM Locations
Blue Injected Polypropylene Cone
Non-Fatiguing Rubber Surround
Stamped Steel Basket
Polymer Film Midrange
Neodymium Dome Tweeter
High Temperature Aluminum Voice Coil
70 oz Strontium Magnet Structure
Rubber Boot Magnet Cover
Power Handling: 600 Watts
Impedance: 4 Ohm
Frequency Response: 30Hz-32kHz
Mounting Depth: 3.25''
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