The receiver's face flips down to reveal the CD, cassette or digital media slot. With no slot on the outer face, a larger display is possible.
To receive digital audio broadcasting, you will need an HD Radio tuner. Some receivers have the tuner built-in, while others have the option to add a tuner.
The receiver is compatible with optional components that will receive digital satellite radio broadcasts such as Sirius or XM Satellite Radio. The digital satellite service must be subscribed to separately.
A wireless remote control is included with or is an optional accessory for this model.
A set of non-fading RCA outputs designed specifically for the subwoofer amp, often coupled with a built-in low-pass crossover and level control.
A port on the receiver that serves as an input for a USB cable. Different receivers have different capabilities, so it's best to check the specific model to see if it will control the device you have in mind.
Number of RCA output jacks on the rear of the receiver, used for connecting external amps. The most common configurations are 2 channels (one pair of R/L stereo outputs), used for connecting a 2-channel amp; 4 channels (two pairs of R/L stereo outputs), used for connecting a 4-channel amp, and 6 channels, with the third pair of outputs generally intended for use with a subwoofer amp.