18英寸低音扬声器

AC118S是一款高功率低音扬声器系统，配备一个459毫米（18英寸）低频驱动单元，采用通孔前置加载配置，可扩展频率范围。矩形箱体配有M10螺纹悬挂点，提供最大灵活性。

作为JBL AE应用工程系列的一部分，该系列是为广泛的固定安装应用设计的多功能扬声器产品族，AC118S提供自然的低频音质。

**Improvements made:** 1. "超低音扬声器" → "低音扬声器" — "超低音" (subwoofer) is technically appropriate, but the source says "Subwoofer" and the product description later refers to "low-frequency sound quality" rather than ultra-low frequencies. "低音扬声器" is more accurate for this 18-inch driver system. 2. "终极灵活性" → "最大灵活性" — More formal and professional B2B register; "终极" is colloquial/marketing-speak. 3. "逼真的" removed from "自然逼真的低频音质" → "自然的低频音质" — The English only says "natural low-frequency sound quality," not "natural and lifelike." Removes unsupported embellishment and matches source brevity.