JBL's GTO Series speakers will provide the best possible performance where it matters most — in your car.

The special design of the GTO427 4" speakers extracts maximum power from your car stereo or outboard amplifier for increased sound levels. The woofer cone boasts more surface area than similarly-sized speakers, further improving efficiency and increasing bass production. The woofer's design ensures tight, powerful output from mounting areas like door panels and package shelves.

The GTO427 features the My-Ti™ tweeter, which blends Mylar and titanium to broadcast smooth, well-controlled high frequencies. The GTO427 works in regular 4" openings, as well as "2-hole" (size 4T) applications.