Sony MDX-CA680X has a lot of outstanding features. The SSIR-EXA Tuner is a Sony's proprietary SSIR-EX tuner technology, which can actually adjust the tuner's bandwidth, depending on current environmental conditions such as an improved sound quality and adjacent station interference result. MBP (My Best Position) optimizes system for listener's position, one push - easy operation. D-Bass (Dynamic Bass) is a Sony's unique low frequency enhancement system, which provides up to 18dB of gain to frequencies below 75Hz, without midrange coloration or interference. CD Text feature utilizes disc, track and artist information encoded directly on the CD media. Both playback and media components must have CD Text compatibility. Shock Resistant Memory stores the audio data stream from a CD or MD in a memory buffer. If the laser pick-up mistracks, audio still flows from the buffer preventing an interruption.