The PT4601AIU is a powerful home pre-amplifier that’s been updated for the 21st century - now with support for USB, SD cards, and your iPod or iPhone. Now you can charge your iDevice while playing it back or while using the stereo RCA input on the back. This pre-amp is also equipped with an AM/FM radio with auto-seek and capable of storing up to 50 radio station presets. With a maximum output of 500 watts, the PT4601AIU has the power to fill your room with sound. On the front, two 1/4" microphone inputs allow you to sing along to your music, making the PT4601AIU the perfect amplifier for karaoke parties. You can even add an echo effect to your voices. Outputs include banana-plug speaker terminals, plus two mono RCA outputs dedicated for the subwoofer output, which has its own separate gain control. Control multiple sets of speakers with the A/B speaker out switch. The digital fluorescent display on the front beautifully displays the levels of the input audio. 110 and 220 V switchable.