Kenwood"s KDC-138 CD Receiver includes a front-panel auxiliary input...... a handy feature that isn"t usually found on CD receivers for playing music from other audio sources. You can adjust the input"s level so you won"t get drastic changes in volume when you switch to or from the auxiliary source. This user-friendly Kenwood also features a 5-function toggle switch on the right side of the faceplate that makes it easy to adjust your settings on the go. The stereo"s built-in amplifier offers plenty of power, and you can shape the sound with a 3-band equalizer and six preset tone curves. You get a powerful, onboard amplifier to fill your speakers with clean, clear sound, plus a set of preamp outputs for connecting an external amp or powered sub. If you"re adding a subwoofer, the set of preamp outputs include a low-pass filter and level adjustment to keep the signal clean for great-sounding bass. The KDC-138"s detachable faceplate helps protect your investment. Kenwood made this receiver extremely reliable and easy to use. Features: CD player with built-in MOSFET amplifier (22 watts RMS/50 peak x 4 channels) Plays CDs, CD-Rs, and CD-RW discs Detachable face System Q Sound Control (6 EQ curves and a 3-band equalizer) Low-pass filter and subwoofer level control Front-panel auxiliary input for optional music sources One set of preamp outputs (can be switched to subwoofer mode) 1 year warranty