The Vonyx SM40 Active Studio Monitors are high-quality reference monitors greatly for multimedia applications and use around the home or office. These 4″ speakers are designed to produce a flat frequency response for (home) studio recording, mixing, and mastering duties. Volume, bass and treble controls are located on the back panel for adjustments based on your personal preferences. The SM-series features analog amplifiers that are built into the left speaker, while the right speaker is passive so setup is simple. Just plug the left speaker into AC power and connect the included speaker wire from left to right. These Vonyx SM Active Studio Monitor Speakers creates a new performance level in an affordable studio monitor.