The JBL Stage3 427 4-Inch Coaxial Car Speakers are a great upgrade for your 4-inch installation. With a solid 30WRMS nominal power rating, these speakers can deliver the powerful punch you're looking for.
Need a pair of replacement speakers for your car? Look no further than the Pioneer TS-G1020F 4-inch G-Series Speaker. With 30WRMS constant power handling and a tiny mounting depth of just 43mm, the Pioneer TS-G1620F-2 is a great entry-level choice!
Blast out your favourite driving songs with the Sony XS-GTF1039 3-way speakers. Featuring a HOP (Highly Oriented Polyolefin) aramid carbon fiber matrix cone woofer for punchy bass and high-power handling to pump up the volume without affecting sound quality.