Model Number :KDC-138 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