the pile 4-channel preamplifier is perfect for your karaoke and home entertainment sound system it gives you 3000 W peak power to be used for multi speakers with 2 to 8 ohms impedance allowing you to enjoy high quality audio the personal digital amp box supports headphone USB iPod or mp3 FM tuner aux with front loading cd/dvd player 2 microphone inputs with an echo effect for karaoke 1 RCA preamp output and 2 mono RCA dedicated for subwoofer the professional integrated indoor house stereo receiver is equipped with Bluetooth wireless music streaming works with today's latest devices including smartphones tablets laptops and computers with hassle-free receive repairing the speaker sound amplifying device has crisp buttons for the audio sources and selectors rotary knob for equalization and master volume adjustments it also features blue LED illuminated buttons and knobs for high visibilit