QS15 ultra-low frequency system is equipped with a 15-inch bass, high energy drive, a well-designed to accommodate the logarithmic horn loaded box in the.
QS15超低频系统配备一个15英寸低音，高能量驱动器容纳在一个良好设计的对数式号筒装载箱体中。
2
Sealed box equipped with 21 V2 subwoofer. Installation kit included. Dependable bass reproduction in a compact environment.
该密封音箱采用21 V2超低音单元，内附安装配件，紧密结构重现强劲低音。
3
After being encouraged by the spruce horn experience, I built a couple of monitor speakers, a guitar combo amplifier and a bass-guitar box with an ALTEC 416b driver.