HD-690CF 6" x 9" Carbon Fiber Subwoofer with Cast Mid-Woofer - High Performance Car Audio for Deep Bass & Clear Sound | Perfect for Car Stereo Upgrades & Custom Audio Systems

Huge a$$ driver magnets and great carbon fiber built cone. The CF is supposed to lower frequency response however due to the large magnets these are too big to mount in many locations.I intended to install these in the front doors of my F150 however when trying to mock them up the crash bar is in the way and when testing the windows in the down position the magnets are hitting the window frame or window itself.These might work in a custom location or with an oversized mounting plate but these are not drop in replacements so I had to return them for a refund.I will update the review due to a possible return conflict/contradiction in the original ad vs the return instructions when submitting the return back to Woofers Etc.