The SM400i is a 4, coaxial, ported speaker with a low-profile surface-mount enclosure design for indoor/outdoor applications that delivers a consistent dispersion pattern (2 to 10 kHz, independently verified.) Mounting hardware is included and features a corrosion and theft resistant Stealth U-bracket for easy and secure installation. Nearly invisible from sightlines, the Stealth U-bracket includes one way fasteners for tool-free, theft-resistant security. SoundTube's custom-engineered driver and electro-acoustic network deliver high-performance sound in a cost-effective surface-mount speaker design. The SM400i speaker incorporates a five-position tap switch with transformer bypass position for simplified ordering and stocking. Included port plugs can be used for added weather resistance. Applications Engineered with professional grade components, the SM400i delivers high-quality music and messaging for indoor and outdoor background to mid-level SPL applications. Cost-effective engineering with high-performance sound makes the SM400i speaker ideal for applications including retail, grocery stores, restaurants, hotels, casinos, museums, trade shows and conference rooms. For applications where additional bass is required, SoundTube's RS1001i-II-T and SM1001p subwoofers provide bass down to 41 Hz.