Compact High-Performance PA System. The Alto Professional Trouper is a compact high-performance PA system that perfectly fulfills the unique demands of solo artists and small ensembles. Leveraging technology from our widely-acclaimed Truesonic and Black Series sound reinforcement systems, Trouper is the best-sounding and most full-featured small-venue PA system available. Trouper is a 2-way 200-watt bi-amplified system (130 watts LF/70 watts HF) with (3) 6-1/2" (165mm) woofers and a 1" (25mm) high-frequency compression driver, spanning the full musical frequency range from 65-20kHz. The system has thermal and dynamic overload protection, so the sound is always clean and clear no matter how hard you push it. Trouper is brimming with thoughtful touches and conveniences that are exactly what you need to ensure your performances are smooth and glitch-free. Features include:; Three channels of inputs: line/mic 1, line/mic 2, and Aux; XLR, RCA, 1/4" and 1/8" connectors; 2-Band (LF/HF) built-in EQ for each channel; Full Bluetooth® capability for streaming input signals wirelessly (plus wireless linking of another Trouper system for stereo applications); Trapezoidal enclosure dramatically reduces internal standing wave resonances, resulting in cleaner output in upper bass and vocal range