We stock 13" subwoofers that will provide your car audio system with tight clean, sound quality proof bass. Why buy a 13" subwoofer, smack in the middle of a 12" and a 15" you ask?  With a 13" sub you will get the best of both worlds the sound quality and response time of a 12" with the output of a 15" subwoofer.  JL Audio is the foremost provider of 13" subwoofers and makes the best in the car audio industry.