PA system/powered monitor have 2-way speaker system. The two-way speaker system gives the PA6S a much wider frequency response than earlier models. This means that full range music such as keyboards or backing tracks will come through with solid bass and crisp highs. This enhanced frequency response makes it a great stand-alone PA system for small club gigs as well as lectures and A/V presentations. Plus a simple adjustment of the 3-band EQ can alter the response for singers who love the time-honored accentuated midrange of the classic hot spot vocal monitor. It has a built in 170 watt amplifier designed to handle the most demanding audio situations. This high tech class D amplifier produces plenty of power to cover a wide variety of applications. This design allows the PA6S to function both as a stand-alone PA system and as a high-powered vocal monitor to cut through loud stage volumes. For larger gigs that require more coverage, you may simply patch from the preamplifier output to the main house PA, while using the PA6S as your onstage monitor. The PA6S also features a built in 18dB Compressor/Limiter circuit with Compressor and Clip LEDs. The Compressor acts to smooth out transient peaks in the signals, thus improving overall sound quality and increasing apparent volume. The Limiter helps protect the woofer and tweeter from being damaged by amplifier distortion. The clip LED indicates when a reduction in volume is recommended.