JL Audio makes many different lines of subwoofers. The W0 line is no longer made. The replacement model is the W1v2. JL took the knowledge learned from the development of the W7 and W6v2 and have really knocked a home run with the W1v2. Serious output for a $119 10" and good sound quality too. I have sold many brands over the last 17 years and JL is by far one of the best performing, most reliable brands I have ever sold. IMO, unless you NEED a custom enclosure, you should buy one of their enclosures with woofers. It will be better made than any prefab box, it will be designed for the particular woofer that is in it, and it will be inexpensive.