At the core of the SL-SV590W's audio performance is Panasonic's advanced D.sound technology, which comprises four main components: a digital amplifier that reduces distortion for a clearer overall sound; the bass-enhancing capacity of S-XBS super bass boost and the digital audio gain control; and an MP3 remastering function that restores much of the lost fidelity of compressed MP3 audio files. The system also kicks up the bass performance inside your headphones with its H.Bass technology, which reproduces the harmonic series of bass components that traditionally vanish within smaller speaker drivers. H.Bass gives the listener the sensation of a fuller bass sound even though it doesn't actually exist.

Another nice feature is the SL-SV590's digital FM tuner, which lets you catch your favorite music, NPR, or public radio stations. Add in the unit's extra-long playback times--which extend up to 75 hours for MP3s and 33 hours for CDs on just two AA alkaline batteries (not included)--and you have a great CD player for long road trips or marathon workouts.

What's in the Box
SL-SV590W CD player, headphones, user's manual.