JL Audio: Their subwoofers, such as some products with built-in amplifiers, are designed and developed by renowned professional electroacoustics experts, with excellent performance.

Polk Audio: Many of Polk Audio's subwoofers are equipped with built-in amplifiers to provide stronger bass effects. Their products focus on sound quality and performance in design, while also having a simple and fashionable appearance.

Infinity: Infinity's subwoofers adopt advanced audio technology and are equipped with built-in amplifiers, providing excellent sound quality and bass performance.

Please note that each brand of speaker has its own characteristics and style, so it is best to choose based on your own needs and preferences.