Behringer Ultracoustic ACX900 90-Watt 2-Channel Stereo Acoustic Instrument Amplifier Powerful 90-Watt, 2-channel stereo amplifier for acoustic instruments and vocals 2 original 8" BUGERA dual-cone speakers for ultimate sound reproduction 2 integrated digital FX processors each with 16 awesome effects programs including reverb, modulation, delay, and various effects combinations Revolutionary FBQ Feedback Detection system instantly reveals critical frequencies 2 dedicated instrument and microphone channels with separate Gain and FX controls