Ultra-compact Indoor/ Outdoor Background/ Foreground Speaker. The Control® 23-1 is a two-way 3” speaker with rich sonic character, wide-coverage, consistent dispersion, versatile mounting, and a contemporary high-design look that fits into a wide range of decors. This makes Control 23-1 an excellent choice for a wide variety of applications, including retail stores, restaurants, health clubs, theme parks, educational facilities, hospitality, music cafes, leisure venues, and anywhere where a top-quality compact indoor/outdoor foreground/background music (and/or paging) speaker is required.